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1.
Murphy, Matthew Douglas.
Inclusive and exclusive electron scattering data analysis from Jefferson Lab experiment E12-14-012.
Degree: PhD, Physics, 2021, Virginia Tech
URL: http://hdl.handle.net/10919/101964 
► Since the first observations of neutrino oscillation, neutrino experiments have come a long way toward precise measurements of the neutrino oscillation parameters, but some of…
(more)
▼ Since the first observations of neutrino oscillation, neutrino experiments have come a long way toward precise measurements of the neutrino oscillation parameters, but some of the properties of neutrinos still remain uncertain. The next generation of neutrino oscillation experiments, including the Deep Underground Neutrino Experiment (DUNE), will be using the Liquid Argon Time Projection Chambers (LArTPCs) with natural argon as the neutrino target material. A precise model of the neutrino cross section on argon does not exist, which will reduce the opportunity for DUNE to measure the neutrino properties with high precision. The E12-14-012 experiment at Jefferson Lab seeks to help remedy this via electron scattering measurements on argon and titanium targets. The experiment collected both inclusive (
e,e') and exclusive (
e,e'p) data.The goal of this experiment is measure the electron-nucleus interactions and provide a nuclear model for electron and neutrino interactions. This Ph.D. thesis collects several papers which present the results from the Jefferson lab E12-14-012 experiment.
Advisors/Committee Members: Mariani, Camillo (committeechair), Horiuchi, Shunsaku (committee member), Piilonen, Leo E. (committee member), Huber, Patrick (committee member).
Subjects/Keywords: electron scattering; neutrino; JLab
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APA (6th Edition):
Murphy, M. D. (2021). Inclusive and exclusive electron scattering data analysis from Jefferson Lab experiment E12-14-012. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/101964
Chicago Manual of Style (16th Edition):
Murphy, Matthew Douglas. “Inclusive and exclusive electron scattering data analysis from Jefferson Lab experiment E12-14-012.” 2021. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/101964.
MLA Handbook (7th Edition):
Murphy, Matthew Douglas. “Inclusive and exclusive electron scattering data analysis from Jefferson Lab experiment E12-14-012.” 2021. Web. 18 Apr 2021.
Vancouver:
Murphy MD. Inclusive and exclusive electron scattering data analysis from Jefferson Lab experiment E12-14-012. [Internet] [Doctoral dissertation]. Virginia Tech; 2021. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/101964.
Council of Science Editors:
Murphy MD. Inclusive and exclusive electron scattering data analysis from Jefferson Lab experiment E12-14-012. [Doctoral Dissertation]. Virginia Tech; 2021. Available from: http://hdl.handle.net/10919/101964
2.
Wu, Ruoxu.
Notes on Some (0,2) Supersymmetric Theories in Two Dimensions.
Degree: PhD, Physics, 2017, Virginia Tech
URL: http://hdl.handle.net/10919/77921
► This thesis is devoted to a discussion of two-dimensional theories with (0,2) supersymmetry. Examples of two-dimensional (0,2) gauged linear sigma models (GLSMs) are constructed for…
(more)
▼ This thesis is devoted to a discussion of two-dimensional theories with (0,2) supersymmetry. Examples of two-dimensional (0,2) gauged linear sigma models (GLSMs) are constructed for various spaces including Grassmannians, complete intersections in Grassmannians, and non-complete intersections such as Pfaffians. Generalizations of (2,2) Toda dual theories to (0,2) Toda-like theories are also discussed and some examples are given, including products of projective spaces and del Pezzo surfaces. Correlation functions are computed to show the examples are the correct mirror models.
Advisors/Committee Members: Sharpe, Eric R. (committeechair), Piilonen, Leo E. (committee member), Huber, Patrick (committee member), Pleimling, Michel Jean (committee member).
Subjects/Keywords: Supersymmetry; Mirror Symmetry; Topological Field Theory; String Compactification
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APA (6th Edition):
Wu, R. (2017). Notes on Some (0,2) Supersymmetric Theories in Two Dimensions. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/77921
Chicago Manual of Style (16th Edition):
Wu, Ruoxu. “Notes on Some (0,2) Supersymmetric Theories in Two Dimensions.” 2017. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/77921.
MLA Handbook (7th Edition):
Wu, Ruoxu. “Notes on Some (0,2) Supersymmetric Theories in Two Dimensions.” 2017. Web. 18 Apr 2021.
Vancouver:
Wu R. Notes on Some (0,2) Supersymmetric Theories in Two Dimensions. [Internet] [Doctoral dissertation]. Virginia Tech; 2017. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/77921.
Council of Science Editors:
Wu R. Notes on Some (0,2) Supersymmetric Theories in Two Dimensions. [Doctoral Dissertation]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/77921
3.
Li, Yao.
Analysis of B Meson Decays to Three Charged Pions.
Degree: PhD, Physics, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/64388
► Decays of B mesons to three-body charmless final states probe the properties of the weak interaction through their dependence on the complex quark couplings in…
(more)
▼ Decays of B mesons to three-body charmless final states probe the properties of the weak interaction through their dependence on the complex quark couplings in the CKM matrix. They also test dynamical models for hadronic B decays. Based on a sample of 772 million BB pairs collected by the Belle experiment, we present a study of direct CP violation in the decay of charged B to three charged pions.
Advisors/Committee Members: Piilonen, Leo E. (committeechair), Sharpe, Eric R. (committee member), Link, Jonathan Marion (committee member), Heremans, Jean Joseph (committee member).
Subjects/Keywords: Decays of B mesons; CP violation
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APA (6th Edition):
Li, Y. (2015). Analysis of B Meson Decays to Three Charged Pions. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/64388
Chicago Manual of Style (16th Edition):
Li, Yao. “Analysis of B Meson Decays to Three Charged Pions.” 2015. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/64388.
MLA Handbook (7th Edition):
Li, Yao. “Analysis of B Meson Decays to Three Charged Pions.” 2015. Web. 18 Apr 2021.
Vancouver:
Li Y. Analysis of B Meson Decays to Three Charged Pions. [Internet] [Doctoral dissertation]. Virginia Tech; 2015. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/64388.
Council of Science Editors:
Li Y. Analysis of B Meson Decays to Three Charged Pions. [Doctoral Dissertation]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/64388
4.
Guo, Jirui.
Chiral Rings of Two-dimensional Field Theories with (0,2) Supersymmetry.
Degree: PhD, Physics, 2017, Virginia Tech
URL: http://hdl.handle.net/10919/77530
► This thesis is devoted to a thorough study of chiral rings in two-dimensional (0,2) theories. We first discuss properties of chiral operators in general two-dimensional…
(more)
▼ This thesis is devoted to a thorough study of chiral rings in two-dimensional (0,2) theories. We first discuss properties of chiral operators in general two-dimensional (0,2) nonlinear sigma models, both in theories twistable to the A/2 or B/2 model, as well as in non-twistable theories. As a special case, we study the quantum sheaf cohomology of Grassmannians as a deformation of the usual quantum cohomology. The deformation corresponds to a (0,2) deformation of the nonabelian gauged linear sigma model whose geometric phase is associated with the Grassmannian. Combined with the classical result, the quantum ring structure is derived from the one-loop effective potential. Supersymmetric localization is also applicable in this case, which proves to be efficient in computing A/2 correlation functions. We then compute chiral operators in general (0,2) nonlinear sigma models, and apply them to the Gadde-Gukov-Putrov triality proposal, which says that certain triples of (0,2) GLSMs should RG flow to nontrivial IR fixed points. As another application, we extend previous works to construct (0,2) Toda-like mirrors to the sigma model engineering Grassmannians.
Advisors/Committee Members: Sharpe, Eric R. (committeechair), Anderson, Lara Briana (committee member), Huber, Patrick (committee member), Piilonen, Leo E. (committee member).
Subjects/Keywords: Chiral Ring; Nonlinear Sigma Model; Gauged Linear Sigma Model; (0,2) Supersymmetry; Grassmannian; Triality
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APA (6th Edition):
Guo, J. (2017). Chiral Rings of Two-dimensional Field Theories with (0,2) Supersymmetry. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/77530
Chicago Manual of Style (16th Edition):
Guo, Jirui. “Chiral Rings of Two-dimensional Field Theories with (0,2) Supersymmetry.” 2017. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/77530.
MLA Handbook (7th Edition):
Guo, Jirui. “Chiral Rings of Two-dimensional Field Theories with (0,2) Supersymmetry.” 2017. Web. 18 Apr 2021.
Vancouver:
Guo J. Chiral Rings of Two-dimensional Field Theories with (0,2) Supersymmetry. [Internet] [Doctoral dissertation]. Virginia Tech; 2017. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/77530.
Council of Science Editors:
Guo J. Chiral Rings of Two-dimensional Field Theories with (0,2) Supersymmetry. [Doctoral Dissertation]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/77530
5.
Gu, Wei.
Gauged Linear Sigma Model and Mirror Symmetry.
Degree: PhD, Physics, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/90892
► In this thesis, I summarize my work on gauged linear sigma models (GLSMs) and mirror symmetry. We begin by using supersymmetric localization to show that…
(more)
▼ In this thesis, I summarize my work on gauged linear sigma models (GLSMs) and mirror symmetry. We begin by using supersymmetric localization to show that A-twisted GLSM correlation functions for certain supermanifolds are equivalent to corresponding A-twisted GLSM correlation functions for hypersurfaces. We also define associated Cartan theories for non-abelian GLSMs. We then consider N =(0,2) GLSMs. For those deformed from N =(2,2) GLSMs, we consider A/2-twisted theories and formulate the genus-zero correlation functions on Coulomb branches. We reproduce known results for abelian GLSMs, and can systematically compute more examples with new formulas that render the quantum sheaf cohomology relations and other properties are manifest. We also include unpublished results for counting deformation parameters. We then turn to mirror symmetry, a duality between seemingly-different two-dimensional quantum field theories. We propose an extension of the Hori-Vafa mirror construction [25] from abelian (2,2) GLSMs to non-abelian (2,2) GLSMs with connected gauge groups, a potential solution to an old problem. In this thesis, we study two examples, Grassmannians and two-step flag manifolds, verifying in each case that the mirror correctly reproduces details ranging from the number of vacua and correlations functions to quantum cohomology relations. We then propose an extension of the HoriVafa construction [25] of (2,2) GLSM mirrors to (0,2) theories obtained from (2,2) theories by special tangent bundle deformations. Our ansatz can systematically produce the (0,2) mirrors of toric varieties and the results are consistent with existing examples. We conclude with a discussion of directions that we would like to pursue in the future.
Advisors/Committee Members: Sharpe, Eric R. (committeechair), Gray, James Alexander (committee member), Piilonen, Leo E. (committee member), Anderson, Lara Briana (committee member).
Subjects/Keywords: GLSM; Mirror Symmetry; TQFT
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APA (6th Edition):
Gu, W. (2019). Gauged Linear Sigma Model and Mirror Symmetry. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/90892
Chicago Manual of Style (16th Edition):
Gu, Wei. “Gauged Linear Sigma Model and Mirror Symmetry.” 2019. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/90892.
MLA Handbook (7th Edition):
Gu, Wei. “Gauged Linear Sigma Model and Mirror Symmetry.” 2019. Web. 18 Apr 2021.
Vancouver:
Gu W. Gauged Linear Sigma Model and Mirror Symmetry. [Internet] [Doctoral dissertation]. Virginia Tech; 2019. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/90892.
Council of Science Editors:
Gu W. Gauged Linear Sigma Model and Mirror Symmetry. [Doctoral Dissertation]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/90892
6.
Williams, Kimberly Marie.
Search the decay of the B meson to two leptons at the Belle Experiment.
Degree: PhD, Physics, 2016, Virginia Tech
URL: http://hdl.handle.net/10919/73753
► The set of decays known as B⁰ → l⁺l⁻ are exceedingly rare. This thesis details procedures developed to optimize signal extraction and improve the upper…
(more)
▼ The set of decays known as B⁰ → l⁺l⁻ are exceedingly rare. This thesis details procedures developed to optimize signal extraction and improve the upper limit on the measured branching fraction. When applied to 85 million BB events collected at the Belle experiment in Tsukuba, Japan, the resulting upper limits on branching fractions were 8.8×10⁻⁸ for B⁰ → e⁺e⁻, 1.0×10⁻⁷ for B⁰ → μ⁺μ⁻, and 8.5×10⁻⁸ for B⁰ → e±μ∓" at the 90% confidence level.
Advisors/Committee Members: Piilonen, Leo E. (committeechair), Pitt, Mark L. (committee member), Simonetti, John H. (committee member), Huber, Patrick (committee member).
Subjects/Keywords: B physics; leptons; Belle experiment
…The barrel KLM was designed and built by Virginia
Tech. Figure 2.3 shows the side-view of…
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APA (6th Edition):
Williams, K. M. (2016). Search the decay of the B meson to two leptons at the Belle Experiment. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/73753
Chicago Manual of Style (16th Edition):
Williams, Kimberly Marie. “Search the decay of the B meson to two leptons at the Belle Experiment.” 2016. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/73753.
MLA Handbook (7th Edition):
Williams, Kimberly Marie. “Search the decay of the B meson to two leptons at the Belle Experiment.” 2016. Web. 18 Apr 2021.
Vancouver:
Williams KM. Search the decay of the B meson to two leptons at the Belle Experiment. [Internet] [Doctoral dissertation]. Virginia Tech; 2016. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/73753.
Council of Science Editors:
Williams KM. Search the decay of the B meson to two leptons at the Belle Experiment. [Doctoral Dissertation]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/73753
7.
See, Erich M.
Plasmon Directed Chemical Reactivity and Nanoparticle Self-Assembly.
Degree: PhD, Physics, 2017, Virginia Tech
URL: http://hdl.handle.net/10919/85400
► Nanotechnology has advanced to the point that nanoparticles can now be fabricated in a broad variety of shapes from a wide range of materials, each…
(more)
▼ Nanotechnology has advanced to the point that nanoparticles can now be fabricated in a broad variety of shapes from a wide range of materials, each with their own properties and uses. As the list of manufacturable particles continues to grow, a new frontier presents itself: assembling these existing nanoparticles into more complicated nanoscale structures. The primary objective of this thesis is to demonstrate and characterize one such method of nanoscale construction, the plasmonically directed self-assembly of gold nanospheres onto both silver nanospheroids and gold nanorods. At the heart of this research is a the use of a photocleavable ligand (1-(6-Nitrobenzo[d][1,3]dioxol-5-yl)ethyl(4-(1,2-Dithiolan-3-yl)butyl) carbamate), which is capable of forming a photoreactive self-assembly monolayer (SAM) on gold and silver surfaces. After photoactivation, this SAM becomes positively charged at low pH, allowing it to electrostatically bind with negatively charged gold nanospheres (or other negatively charged nanoparticles). In this thesis, I describe both a secondary photoreaction that this ligand is capable post-photocleavage, which removes the ligand's ability to bind to negatively charged gold nanospheres, allowing for, among other assembly methods, reverse photopatterning. I further show that this photocleavable ligand can be used in conjunction with gold nanospheres to create aligned, metal structures on silver nanospheroid surface by exposure to linearly polarized UV light. Similarly, I also demonstrate how the ligand can be used to preferentially bind gold nanospheres to the ends of gold nanorods with the use of ultrafast femtosecond pulsed 750 nm laser light, making use of multi-photon absorption. Both methods of self-assembly, as well as the secondary photoreaction, are dependent on the plasmonics of the metal nanoparticles. This thesis also goes into the backgrounds of plasmonics, plasmonically mediated catalysis, self-assembly, and photocleavable chemicals.
Advisors/Committee Members: Robinson, Hans D. (committeechair), Davis, Richey M. (committee member), Piilonen, Leo E. (committee member), Heremans, Jean Joseph (committee member).
Subjects/Keywords: Nanotechnology; Nano; Plasmon; Plasmonics; Surface Plasmon Resonance; SPR; Self-assembly. nanoparticle
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APA (6th Edition):
See, E. M. (2017). Plasmon Directed Chemical Reactivity and Nanoparticle Self-Assembly. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/85400
Chicago Manual of Style (16th Edition):
See, Erich M. “Plasmon Directed Chemical Reactivity and Nanoparticle Self-Assembly.” 2017. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/85400.
MLA Handbook (7th Edition):
See, Erich M. “Plasmon Directed Chemical Reactivity and Nanoparticle Self-Assembly.” 2017. Web. 18 Apr 2021.
Vancouver:
See EM. Plasmon Directed Chemical Reactivity and Nanoparticle Self-Assembly. [Internet] [Doctoral dissertation]. Virginia Tech; 2017. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/85400.
Council of Science Editors:
See EM. Plasmon Directed Chemical Reactivity and Nanoparticle Self-Assembly. [Doctoral Dissertation]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/85400
8.
Duvall, Wade Sayer.
Precision Measurement of the Proton's Weak Charge using Parity-Violating Electron Scattering.
Degree: PhD, Physics, 2017, Virginia Tech
URL: http://hdl.handle.net/10919/89476
► The Qweak experiment has precisely determined the weak charge of the proton Qp w by measuring the parity-violating asymmetry in elastic electron-proton scattering at a…
(more)
▼ The Qweak experiment has precisely determined the weak charge of the proton Qp w by measuring the parity-violating asymmetry in elastic electron-proton scattering at a low momentum transfer of Q2 = 0.0249 (GeV/c)2 . Qpw has a definite prediction in the Standard Model, and a value of sin2 θW can be extracted from it for comparison with other neutral current observables. Qweak measured the weak charge of the proton to be Qpw(P V ES) = 0.0719 ± 0.0045, which is consistent with the Standard Model value of Qp w(SM) = 0.0708 ± 0.0003. Qweak ran at the Thomas Jefferson National Accelerator Facility for two and a half years and was installed in experimental Hall C. A 180µA beam of longitudinally polarized electrons at 1.16 GeV scattered off a liquid hydrogen target of unpolarized protons. The electrons were collimated to an acceptance of 5.8◦ to 11.6◦ and then passed through a magnetic spectrometer and onto quartz Čerenkov detector bars.
A detailed description of the theory and motivation behind the Qweak experiment is given. An overview of the Qweak apparatus and an in-depth discussion of the luminosity monitor performance is presented. A general overview of the Qweak analysis is also presented, with a focus on the beamline background correction, the nonlinearity measurement, and the simulation to constrain error for a rescattering effect. Also detailed here is the final, unblinded Qweak result, which determined Qpw to 6.2% and provided the highest precision measurement of sin2θW at low energy.
Advisors/Committee Members: Pitt, Mark L. (committeechair), Huber, Patrick (committee member), Simonetti, John H. (committee member), Piilonen, Leo E. (committee member), Sharpe, Eric R. (committee member).
Subjects/Keywords: nuclear physics; electromagnetic; electroweak; parity violation; symmetry; proton; weak charge; Qweak
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APA (6th Edition):
Duvall, W. S. (2017). Precision Measurement of the Proton's Weak Charge using Parity-Violating Electron Scattering. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/89476
Chicago Manual of Style (16th Edition):
Duvall, Wade Sayer. “Precision Measurement of the Proton's Weak Charge using Parity-Violating Electron Scattering.” 2017. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/89476.
MLA Handbook (7th Edition):
Duvall, Wade Sayer. “Precision Measurement of the Proton's Weak Charge using Parity-Violating Electron Scattering.” 2017. Web. 18 Apr 2021.
Vancouver:
Duvall WS. Precision Measurement of the Proton's Weak Charge using Parity-Violating Electron Scattering. [Internet] [Doctoral dissertation]. Virginia Tech; 2017. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/89476.
Council of Science Editors:
Duvall WS. Precision Measurement of the Proton's Weak Charge using Parity-Violating Electron Scattering. [Doctoral Dissertation]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/89476
Virginia Tech
9.
Jaffke, Patrick John.
Corrections to and Applications of the Antineutrino Spectrum Generated by Nuclear Reactors.
Degree: PhD, Physics, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/80031
► In this work, the antineutrino spectrum as specifically generated by nuclear reactors is studied. The topics covered include corrections and higher-order effects in reactor antineutrino…
(more)
▼ In this work, the antineutrino spectrum as specifically generated by nuclear reactors is studied. The topics covered include corrections and higher-order effects in reactor antineutrino experiments, one of which is covered in Ref. [1] and another contributes to Ref. [2]. In addition, a practical application, antineutrino safeguards for nuclear reactors, as summarized in Ref. [3,4] and Ref. [5], is explored to determine its viability and limits. The work will focus heavily on theory, simulation, and statistical analyses to explain the corrections, their origins, and their sizes, as well as the applications of the antineutrino signal from nuclear reactors.
Chapter [1] serves as an introduction to neutrinos. Their origin is briefly covered, along with neutrino properties and some experimental highlights. The next chapter, Chapter [2], will specifically cover antineutrinos as generated in nuclear reactors. In this chapter, the production and detection methods of reactor neutrinos are introduced as well as a discussion of the theories behind determining the antineutrino spectrum. The mathematical formulation of neutrino oscillation will also be introduced and explained.
The first half of this work focuses on two corrections to the reactor antineutrino spectrum. These corrections are generated from two specific sources and are thus named the spent nuclear fuel contribution and the non-linear correction for their respective sources. Chapter [3] contains a discussion of the spent fuel contribution. This correction arises from spent nuclear fuel near the reactor site and involves a detailed application of spent fuel to current reactor antineutrino experiments. Chapter [4] will focus on the non-linear correction, which is caused by neutron-captures within the nuclear reactor environment. Its quantification and impact on future antineutrino experiments are discussed.
The research projects presented in the second half, Chapter [5], focus on neutrino applications, specifically reactor monitoring. Chapter [5] is a comprehensive examination of the use of antineutrinos as a reactor safeguards mechanism. This chapter will include the theory behind safeguards, the statistical derivation of power and plutonium measurements, the details of reactor simulations, and the future outlook for non-proliferation through antineutrino monitoring.
Advisors/Committee Members: Huber, Patrick (committeechair), Link, Jonathan Marion (committee member), Piilonen, Leo E. (committee member), Sharpe, Eric R. (committee member).
Subjects/Keywords: Neutrino Physics; Reactor Physics; Spent Nuclear Fuel Correction; Non-linear Correction; Antineutrino Safeguards; Nuclear Non-proliferation
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APA (6th Edition):
Jaffke, P. J. (2015). Corrections to and Applications of the Antineutrino Spectrum Generated by Nuclear Reactors. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/80031
Chicago Manual of Style (16th Edition):
Jaffke, Patrick John. “Corrections to and Applications of the Antineutrino Spectrum Generated by Nuclear Reactors.” 2015. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/80031.
MLA Handbook (7th Edition):
Jaffke, Patrick John. “Corrections to and Applications of the Antineutrino Spectrum Generated by Nuclear Reactors.” 2015. Web. 18 Apr 2021.
Vancouver:
Jaffke PJ. Corrections to and Applications of the Antineutrino Spectrum Generated by Nuclear Reactors. [Internet] [Doctoral dissertation]. Virginia Tech; 2015. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/80031.
Council of Science Editors:
Jaffke PJ. Corrections to and Applications of the Antineutrino Spectrum Generated by Nuclear Reactors. [Doctoral Dissertation]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/80031
10.
Sun, Chen.
Constraining New Physics with Colliders and Neutrinos.
Degree: PhD, Physics, 2017, Virginia Tech
URL: http://hdl.handle.net/10919/77923
► In this work, we examine how neutrino and collider experiments can each and together put constraints on new physics more stringently than ever. Constraints arise…
(more)
▼ In this work, we examine how neutrino and collider experiments can
each and together put constraints on new physics more stringently than
ever. Constraints arise in three ways. First, possible new
theoretical frameworks are reviewed and analyzed for the compatibility
with collider experiments. We study alternate theories such as the
superconnection formalism and non-commutative geometry (NCG) and show
how these can be put to test, if any collider excess were to show
up. In this case, we use the previous diboson and diphoton statistical
excess as examples to do the analysis. Second, we parametrize low
energy new physics in the neutrino sector in terms of non-standard
interactions (NSI), which are constrained by past and proposed future
neutrino experiments. As an example, we show the capability of
resolving such NSI with the OscSNS, a detector proposed for Oak Ridge
National Lab and derive interesting new constraints on NSI at very low
energy ( ≤ sssim 50 MeV). Apart from this, in order to better
understand the NSI matter effect in long baseline experiments such as
the future DUNE experiment, we derive a new compact formula to
describe the effect analytically, which provides a clear physical
picture of our understanding of the NSI matter effect compared to
numerical computations. Last, we discuss the possibility of combining
neutrino and collider data to get a better understanding of where the
new physics is hidden. In particular, we study a model that produces
sizable NSI to show how they can be constrained by past collider data,
which covers a distinct region of the model parameter space from the
DUNE experiment. In combining the two, we show that neutrino
experiments are complementary to collider searches in ruling out
models such as the ones that utilize a light mediator particle. More
general procedures in constructing such models relevant to neutrino
experiments are also described.
Advisors/Committee Members: Takeuchi, Tatsu (committeechair), Sharpe, Eric R. (committee member), Piilonen, Leo E. (committee member), Minic, Djordje (committee member).
Subjects/Keywords: New Physics; Collider; Neutrino; Noncommutative Geometry
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APA (6th Edition):
Sun, C. (2017). Constraining New Physics with Colliders and Neutrinos. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/77923
Chicago Manual of Style (16th Edition):
Sun, Chen. “Constraining New Physics with Colliders and Neutrinos.” 2017. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/77923.
MLA Handbook (7th Edition):
Sun, Chen. “Constraining New Physics with Colliders and Neutrinos.” 2017. Web. 18 Apr 2021.
Vancouver:
Sun C. Constraining New Physics with Colliders and Neutrinos. [Internet] [Doctoral dissertation]. Virginia Tech; 2017. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/77923.
Council of Science Editors:
Sun C. Constraining New Physics with Colliders and Neutrinos. [Doctoral Dissertation]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/77923
Virginia Tech
11.
Yokley, Zachary W.
Solar and Sterile Neutrino Physics with the Raghavan Optical Lattice.
Degree: PhD, Physics, 2016, Virginia Tech
URL: http://hdl.handle.net/10919/71330
► The neutrino is, by its nature, an elusive particle that requires massive detectors with small backgrounds to capture a handful of events. Nevertheless, neutrino experiments…
(more)
▼ The neutrino is, by its nature, an elusive particle that requires massive detectors with small backgrounds to capture a handful of events. Nevertheless, neutrino experiments stand at the heart of the current mysteries of particle physics and astrophysics. These include the origin and size of neutrino mass, the existence of additional types of neutrinos, CP violation and the matter – antimatter asymmetry, the amount of metals in the Sun's core, and the existence of non-nuclear energy sources in the Sun. This dissertation concerns the the use of a novel detector technology, the Raghavan Optical Lattice (ROL), in the Low-Energy Neutrino Spectrometer (LENS) and Neutrino Lattice (NuLat) experiments. LENS will measure the solar neutrino luminosity and the Sun's core metallicity using a ROL with indium-loaded liquid scintillator. NuLat will probe the existence of light sterile neutrinos with masses of ∼ 1\,{eV} using a ROL made from
6{Li} -loaded plastic scintillator. For LENS we present an overview of the experiment and the present the ROL construction results from the LENS R\andD program. In particular we will present results from the micro- and mini-LENS prototypes. For both LENS and NuLat we present the development of an event reconstruction algorithm for ROLs and we apply these to the expected signals for these experiments. For NuLat we present an overview of the experiment including its theory of operation and its sensitivity to sterile neutrino oscillations. Finally, we present work toward the full-sized NuLat detector through bench-top tests and construction of the NuLat demonstrator.
Advisors/Committee Members: Vogelaar, R. Bruce (committeechair), Pitt, Mark L. (committee member), Sharpe, Eric R. (committee member), Piilonen, Leo E. (committee member).
Subjects/Keywords: Solar Neutrinos; Sterile Neutrinos; Raghavan Optical Lattice; Li-loaded plastic scintillator
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APA (6th Edition):
Yokley, Z. W. (2016). Solar and Sterile Neutrino Physics with the Raghavan Optical Lattice. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/71330
Chicago Manual of Style (16th Edition):
Yokley, Zachary W. “Solar and Sterile Neutrino Physics with the Raghavan Optical Lattice.” 2016. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/71330.
MLA Handbook (7th Edition):
Yokley, Zachary W. “Solar and Sterile Neutrino Physics with the Raghavan Optical Lattice.” 2016. Web. 18 Apr 2021.
Vancouver:
Yokley ZW. Solar and Sterile Neutrino Physics with the Raghavan Optical Lattice. [Internet] [Doctoral dissertation]. Virginia Tech; 2016. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/71330.
Council of Science Editors:
Yokley ZW. Solar and Sterile Neutrino Physics with the Raghavan Optical Lattice. [Doctoral Dissertation]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/71330
Virginia Tech
12.
Drozdetski, Aleksander Vladimirovich.
Unexpected mechanical properties of nucleic acids.
Degree: PhD, Physics, 2016, Virginia Tech
URL: http://hdl.handle.net/10919/71660
► Mechanical deformations of nucleic acids (NA) play a very important role in many biological life processes. The bending persistence length of DNA is of specific…
(more)
▼ Mechanical deformations of nucleic acids (NA) play a very important role in many biological life processes. The bending persistence length of DNA is of specific interest, because so much eukaryotic DNA that stores genetic information is tightly packed inside cell nuclei, even though DNA is considered to be a relatively stiff biopolymer. However, recent experiments suggest that DNA may be more flexible than its persistence length (~ 150 bp or ~ 47 nm) suggests, especially for fragments shorter than 100 bp. It is important to reconcile these two seemingly competing pictures of DNA bending by providing a model that can explain the novel results without discrediting old experiments and the widely-accepted worm-like chain model. Another factor that influences both molecular geometry as well as mechanical properties is the ionic atmosphere surrounding the NA. It is known that multivalent ions with charge of +3e and higher can condense DNA into aggregates at high enough concentration. However, most conventional models cannot explain why RNA and DNA condense at different concentrations. Furthermore, our recent simulation results suggest that even though DNA persistence length decreases with multivalent ion concentration due to increasing electrostatic screening, RNA actually becomes stiffer due to a structural transition from the internal binding of the counterions.
Advisors/Committee Members: Onufriev, Alexey (committeechair), Pleimling, Michel Jean (committeechair), Tauber, Uwe C. (committee member), Piilonen, Leo E. (committee member).
Subjects/Keywords: DNA; RNA; persistence length; NA condensation; molecular dynamics
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APA (6th Edition):
Drozdetski, A. V. (2016). Unexpected mechanical properties of nucleic acids. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/71660
Chicago Manual of Style (16th Edition):
Drozdetski, Aleksander Vladimirovich. “Unexpected mechanical properties of nucleic acids.” 2016. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/71660.
MLA Handbook (7th Edition):
Drozdetski, Aleksander Vladimirovich. “Unexpected mechanical properties of nucleic acids.” 2016. Web. 18 Apr 2021.
Vancouver:
Drozdetski AV. Unexpected mechanical properties of nucleic acids. [Internet] [Doctoral dissertation]. Virginia Tech; 2016. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/71660.
Council of Science Editors:
Drozdetski AV. Unexpected mechanical properties of nucleic acids. [Doctoral Dissertation]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/71660
Virginia Tech
13.
Intoy, Ben Frederick Martir.
Pure and Mixed Strategies in Cyclic Competition: Extinction, Coexistence, and Patterns.
Degree: PhD, Physics, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/51999
► We study game theoretic ecological models with cyclic competition in the case where the strategies can be mixed or pure. For both projects, reported in…
(more)
▼ We study game theoretic ecological models with cyclic competition in the case where the strategies can be mixed or pure. For both projects, reported in [49] and [50], we employ Monte Carlo simulations to study finite systems.
In chapter 3 the results of a previously published paper [49] are presented and expanded upon, where we study the extinction time of four cyclically competing species on different lattice structures using Lotka-Volterra dynamics. We find that the extinction time of a well mixed system goes linearly with respect to the system size and that the probability distribution approximately takes the shape of a shifted exponential. However, this is not true for when spatial structure is added to the model. In that case we find that instead the probability distribution takes on a non-trivial shape with two characteristic slopes and that the mean goes as a power law with an exponent greater than one. This is attributed to neutral species pairs, species who do not interact, forming domains and coarsening.
In chapter 4 the results of [50] are reported and expanded, where we allow agents to choose cyclically competing strategies out of a distribution. We first study the case of three strategies and find through both simulation and mean field equations that the probability distributions of the agents synchronize and oscillate with time in the limit where the agents probability distributions can be approximated as continuous. However, when we simulate the system on a one-dimensional lattice and the probability distributions are small and discretized, it is found that there is a drastic transition in stability, where the average extinction time of a strategy goes from being a power law with respect to system size to an exponential. This transition can also be observed in space time images with the emergence of tile patterns. We also look into the case of four cyclically competing strategies and find results similar to that of [49], such as the coarsening of neutral domains. However, the transition from power law to exponential for the average extinction time seen for three strategies is not observed, but we do find a transition from one power law to another with a different slope.
This work was supported by the United States National Science Foundation through grants DMR-0904999 and DMR-1205309.
Advisors/Committee Members: Pleimling, Michel J. (committeechair), Piilonen, Leo E. (committee member), Tauber, Uwe C. (committee member), Mccaskey (committee member).
Subjects/Keywords: Evolutionary Game Theory; Population Dynamics; Non-Equilibrium Statistical Physics; Pattern Formation
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APA (6th Edition):
Intoy, B. F. M. (2015). Pure and Mixed Strategies in Cyclic Competition: Extinction, Coexistence, and Patterns. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/51999
Chicago Manual of Style (16th Edition):
Intoy, Ben Frederick Martir. “Pure and Mixed Strategies in Cyclic Competition: Extinction, Coexistence, and Patterns.” 2015. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/51999.
MLA Handbook (7th Edition):
Intoy, Ben Frederick Martir. “Pure and Mixed Strategies in Cyclic Competition: Extinction, Coexistence, and Patterns.” 2015. Web. 18 Apr 2021.
Vancouver:
Intoy BFM. Pure and Mixed Strategies in Cyclic Competition: Extinction, Coexistence, and Patterns. [Internet] [Doctoral dissertation]. Virginia Tech; 2015. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/51999.
Council of Science Editors:
Intoy BFM. Pure and Mixed Strategies in Cyclic Competition: Extinction, Coexistence, and Patterns. [Doctoral Dissertation]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/51999
Virginia Tech
14.
Jusic, Dragana.
Properties of LEDs for the Calibration of PMTs for the Daya Bay Project.
Degree: MS, Physics, 2008, Virginia Tech
URL: http://hdl.handle.net/10919/36400
► The flavor oscillations of neutrinos due to the mixing of mass eigenstates have been thoroughly studied in several experiments. One missing piece of the puzzle…
(more)
▼ The flavor oscillations of neutrinos due to the mixing of mass eigenstates have been thoroughly studied in several experiments. One missing piece of the puzzle is the mixing angle θ13, which is being searched for by the Daya Bay experiment. Currently, the experiment is still in construction mode. Part of the experiment involves building effective detectors for atmospheric muons, resulting in accurate detection of antineutrinos from the source. To ensure accurate detection, we must effectively calibrate the PMTs with the use of carefully chosen and calibrated LEDs. This thesis details the study of several LEDs measured in an attempt to determine the properties of the most likely source for our calibration efforts. I measured the spectra of the LEDs meant for use in calibration, along with several others for the purpose of comparison of spectrum width and to find the evidence of fluorescence in the LEDs.
Advisors/Committee Members: Link, Jonathan Marion (committeechair), Pitt, Mark L. (committee member), Piilonen, Leo E. (committee member).
Subjects/Keywords: Calibration; LED; Spectrum; Fluorescence
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APA (6th Edition):
Jusic, D. (2008). Properties of LEDs for the Calibration of PMTs for the Daya Bay Project. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/36400
Chicago Manual of Style (16th Edition):
Jusic, Dragana. “Properties of LEDs for the Calibration of PMTs for the Daya Bay Project.” 2008. Masters Thesis, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/36400.
MLA Handbook (7th Edition):
Jusic, Dragana. “Properties of LEDs for the Calibration of PMTs for the Daya Bay Project.” 2008. Web. 18 Apr 2021.
Vancouver:
Jusic D. Properties of LEDs for the Calibration of PMTs for the Daya Bay Project. [Internet] [Masters thesis]. Virginia Tech; 2008. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/36400.
Council of Science Editors:
Jusic D. Properties of LEDs for the Calibration of PMTs for the Daya Bay Project. [Masters Thesis]. Virginia Tech; 2008. Available from: http://hdl.handle.net/10919/36400
Virginia Tech
15.
Hu, Kangping Karen.
Study of photon production in e + e - collisions at Tristan.
Degree: PhD, Physics, 1991, Virginia Tech
URL: http://hdl.handle.net/10919/39778
► A study of photon production in multi-hadronic final states has been made at center-of-mass energies from 55 to 58 GeV with the AMY detector at…
(more)
Subjects/Keywords: Photons.; LD5655.V856 1991.H8
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APA (6th Edition):
Hu, K. K. (1991). Study of photon production in e + e - collisions at Tristan. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/39778
Chicago Manual of Style (16th Edition):
Hu, Kangping Karen. “Study of photon production in e + e - collisions at Tristan.” 1991. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/39778.
MLA Handbook (7th Edition):
Hu, Kangping Karen. “Study of photon production in e + e - collisions at Tristan.” 1991. Web. 18 Apr 2021.
Vancouver:
Hu KK. Study of photon production in e + e - collisions at Tristan. [Internet] [Doctoral dissertation]. Virginia Tech; 1991. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/39778.
Council of Science Editors:
Hu KK. Study of photon production in e + e - collisions at Tristan. [Doctoral Dissertation]. Virginia Tech; 1991. Available from: http://hdl.handle.net/10919/39778
Virginia Tech
16.
Lai, Anzhi.
Bhabha scattering in e⁺e⁻ collisions at TRISTAN.
Degree: PhD, Physics, 1992, Virginia Tech
URL: http://hdl.handle.net/10919/39590
► Bhabha scattering, the process of e⁺e⁻ → e⁺e⁻, has been studied at center-of-mass energies from 50 to 58 GeV with the AMY detector at the…
(more)
▼ Bhabha scattering, the process of e⁺e⁻ → e⁺e⁻, has been studied at center-of-mass energies from 50 to 58 GeV with the AMY detector at the KEK e⁺e⁻ storage ring TRISTAN. The study is based on a data sample of 79.7 <i>pb⁻¹</i> integrated luminosity. The differential cross section of Bhabha scattering has been measured. The measured cross section is found to agree fairly well with the Standard Model of the electroweak theory. The measured cross section is also compared with various four-fermion contact interaction models, and confidence level lower limits on the composite scale, A, are determined. In addition, the limits on VV model are converted to SM-break-down scales, which indicate the validity of the SM down to the distance of order ~ 10⁻¹⁷ cm and the electron charge radius of ~ 10⁻¹⁶ cm. Attempts are made in searching for an additional boson Z'. No clear signal of the existence of a Z' boson is found up to energy of ~160 GeV/c². The effect of transverse beam polarization on Bhabha scattering is also studied. The ϕ dependence of Bhabha events are fitted to the QED prediction and found to agree with the theory. However, no quantitative conclusion on polarization effect can be drawn based on current data sample, which does not provide enough statistics. More data is being accumulated and further study should be carried out.
Advisors/Committee Members: Abashian, Alexander (committeechair), Gotow, Kazuo (committee member), Piilonen, Leo E. (committee member), Chang, Lay Nam (committee member), Bowden, Robert L. (committee member).
Subjects/Keywords: Interacting boson-fermion models; Polarization (Nuclear physics); Thermal neutrons Scattering.; LD5655.V856 1992.L35
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APA (6th Edition):
Lai, A. (1992). Bhabha scattering in e⁺e⁻ collisions at TRISTAN. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/39590
Chicago Manual of Style (16th Edition):
Lai, Anzhi. “Bhabha scattering in e⁺e⁻ collisions at TRISTAN.” 1992. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/39590.
MLA Handbook (7th Edition):
Lai, Anzhi. “Bhabha scattering in e⁺e⁻ collisions at TRISTAN.” 1992. Web. 18 Apr 2021.
Vancouver:
Lai A. Bhabha scattering in e⁺e⁻ collisions at TRISTAN. [Internet] [Doctoral dissertation]. Virginia Tech; 1992. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/39590.
Council of Science Editors:
Lai A. Bhabha scattering in e⁺e⁻ collisions at TRISTAN. [Doctoral Dissertation]. Virginia Tech; 1992. Available from: http://hdl.handle.net/10919/39590
Virginia Tech
17.
Godang, Romulus.
Measurement of the Ratio of Charged and Neutral 𝐵 Mesons in Υ (4𝑆) Events via Partial Reconstruction of the Semileptonic Decays 𝛣̅⁰⟶𝐷∗⁺ℓ⁻𝜈̅ℓ and 𝛣̅⁻⟶𝐷∗⁰ℓ𝜈̅ℓ.
Degree: PhD, Physics, 2000, Virginia Tech
URL: http://hdl.handle.net/10919/28846
► The decays, <img width=119 height=32 align=center src=https://vtechworks.lib.vt.edu/bitstream/handle/10919/28846/image006.gif> and <img width=119 height=29 align=center src=https://vtechworks.lib.vt.edu/bitstream/handle/10919/28846/image008.gif> are studied using data collected at the CLEO II detector at the…
(more)
▼ The decays, <img width=119 height=32 align=center src=https://vtechworks.lib.vt.edu/bitstream/handle/10919/28846/image006.gif> and <img width=119 height=29 align=center src=https://vtechworks.lib.vt.edu/bitstream/handle/10919/28846/image008.gif> are studied using data collected at the CLEO II detector at the Cornell Electron Storage Ring. Both decays are identified using a partial reconstruction method where the <I>D
*</I> is detected only through a pion daughter from the decay <img width=64 height=25 align=center src=https://vtechworks.lib.vt.edu/bitstream/handle/10919/28846/image010.gif>. Because of the similarities in the analyses of the two modes, the ratio of the rates is measured in a way that is independent of the decay model, limited mainly by the uncertainty in the relative efficiency for detecting neutral and charged pions. This ratio is equivalent to the ratio of the product of production fraction and lifetime for charged and neutral B mesons, <img width=31 height=29 align=center src=https://vtechworks.lib.vt.edu/bitstream/handle/10919/28846/image012.gif>.
It is combined with measurements of the lifetime ratio to obtain the ratio of charged and neutral B meson production at the Y(4S) resonance, <img width=175 height=29 align=center src=https://vtechworks.lib.vt.edu/bitstream/handle/10919/28846/image014.gif>.
Advisors/Committee Members: Kinoshita, Kay (committeechair), Chang, Lay Nam (committee member), Indebetouw, Guy J. (committee member), Blecher, Marvin (committee member), Abashian, Alexander (committee member), Piilonen, Leo E. (committeecochair).
Subjects/Keywords: Partial Reconstruction; Semileptonic Decay; B Meson
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APA (6th Edition):
Godang, R. (2000). Measurement of the Ratio of Charged and Neutral 𝐵 Mesons in Υ (4𝑆) Events via Partial Reconstruction of the Semileptonic Decays 𝛣̅⁰⟶𝐷∗⁺ℓ⁻𝜈̅ℓ and 𝛣̅⁻⟶𝐷∗⁰ℓ𝜈̅ℓ. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/28846
Chicago Manual of Style (16th Edition):
Godang, Romulus. “Measurement of the Ratio of Charged and Neutral 𝐵 Mesons in Υ (4𝑆) Events via Partial Reconstruction of the Semileptonic Decays 𝛣̅⁰⟶𝐷∗⁺ℓ⁻𝜈̅ℓ and 𝛣̅⁻⟶𝐷∗⁰ℓ𝜈̅ℓ.” 2000. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/28846.
MLA Handbook (7th Edition):
Godang, Romulus. “Measurement of the Ratio of Charged and Neutral 𝐵 Mesons in Υ (4𝑆) Events via Partial Reconstruction of the Semileptonic Decays 𝛣̅⁰⟶𝐷∗⁺ℓ⁻𝜈̅ℓ and 𝛣̅⁻⟶𝐷∗⁰ℓ𝜈̅ℓ.” 2000. Web. 18 Apr 2021.
Vancouver:
Godang R. Measurement of the Ratio of Charged and Neutral 𝐵 Mesons in Υ (4𝑆) Events via Partial Reconstruction of the Semileptonic Decays 𝛣̅⁰⟶𝐷∗⁺ℓ⁻𝜈̅ℓ and 𝛣̅⁻⟶𝐷∗⁰ℓ𝜈̅ℓ. [Internet] [Doctoral dissertation]. Virginia Tech; 2000. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/28846.
Council of Science Editors:
Godang R. Measurement of the Ratio of Charged and Neutral 𝐵 Mesons in Υ (4𝑆) Events via Partial Reconstruction of the Semileptonic Decays 𝛣̅⁰⟶𝐷∗⁺ℓ⁻𝜈̅ℓ and 𝛣̅⁻⟶𝐷∗⁰ℓ𝜈̅ℓ. [Doctoral Dissertation]. Virginia Tech; 2000. Available from: http://hdl.handle.net/10919/28846
Virginia Tech
18.
Rountree, Steven Derek.
Science and Technology of a Low-Energy Solar Neutrino Spectrometer (LENS) and Development of the MiniLENS Underground Prototype.
Degree: PhD, Physics, 2010, Virginia Tech
URL: http://hdl.handle.net/10919/27803
► A real time low energy spectral measurement of the neutrinos coming from the Sun will give us a greater understanding of energy production in the…
(more)
▼ A real time low energy spectral measurement of the neutrinos coming from the Sun will give us a greater understanding of energy production in the Sun, and the mechanisms of neutrino mixing. We will, for the first time, measure the solar neutrino spectrum for all solar neutrinos <2MeV in particular pp, Be and CNO neutrinos, be able to compare the solar photon derived energy luminosity (Lï §) to the solar neutrino derived energy luminosity (Lï ®) independent of any solar model, explore dark energy with respect to mass varying neutrinos, and explore CNO abundances in the Sun. These measurements require new technology in Indium loaded scintillators and large scale detector designs, namely increased spatial resolution through a novel scintillation lattice. I will present the advances we are making to these fields at
Virginia Tech as well as neutrino science and the physics of the LENS detector.
Advisors/Committee Members: Raghavan, Ramaswamy (committeechair), Piilonen, Leo E. (committee member), Takeuchi, Tatsu (committee member), Pitt, Mark L. (committee member), Vogelaar, R. Bruce (committee member).
Subjects/Keywords: calibration; radiation; Borexino; metal loaded liquid scintillator; neutrino physics; LENS; scintillation lattice
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APA (6th Edition):
Rountree, S. D. (2010). Science and Technology of a Low-Energy Solar Neutrino Spectrometer (LENS) and Development of the MiniLENS Underground Prototype. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/27803
Chicago Manual of Style (16th Edition):
Rountree, Steven Derek. “Science and Technology of a Low-Energy Solar Neutrino Spectrometer (LENS) and Development of the MiniLENS Underground Prototype.” 2010. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/27803.
MLA Handbook (7th Edition):
Rountree, Steven Derek. “Science and Technology of a Low-Energy Solar Neutrino Spectrometer (LENS) and Development of the MiniLENS Underground Prototype.” 2010. Web. 18 Apr 2021.
Vancouver:
Rountree SD. Science and Technology of a Low-Energy Solar Neutrino Spectrometer (LENS) and Development of the MiniLENS Underground Prototype. [Internet] [Doctoral dissertation]. Virginia Tech; 2010. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/27803.
Council of Science Editors:
Rountree SD. Science and Technology of a Low-Energy Solar Neutrino Spectrometer (LENS) and Development of the MiniLENS Underground Prototype. [Doctoral Dissertation]. Virginia Tech; 2010. Available from: http://hdl.handle.net/10919/27803
Virginia Tech
19.
Lee, Fei-sheng.
Measurement of the Michel Parameter Rho Using the MEGA Positron Spectrometer.
Degree: PhD, Physics, 2001, Virginia Tech
URL: http://hdl.handle.net/10919/26790
► This experiment attempts to measure the Michel parameter Rho in normal muon decay Mu to e nue nu_μ with a precision of 0.001. The Standard…
(more)
▼ This experiment attempts to measure the Michel parameter Rho in normal muon decay Mu to
e nu
e nu_μ with a precision of 0.001. The Standard Model with pure V-A interaction gives 0.75 for this parameter. The world average value is 0.7518 +/- 0.0026. A deviation of the value of Rho from 0.75 will indicate new physics.
The experiment, RHO, was carried out at the Los Alamos Meson Physics Facility (LAMPF) of Los Alamos National Laboratory (LANL) in New Mexico, USA, in 1993. The existing experimental set-up that was built for the MEGA experiment was used for the RHO measurement. The experiment was a collaboration of about 50 physicists from Los Alamos National Laboratory, Stanford University, Fermi National Accelerator Laboratory,
Virginia Tech, Texas A University, Indiana University, Valparaiso University, University of Houston, University of Chicago and University of
Virginia.
The result of the experiment is in agreement with Standard Model. The precision of this measurement was dominated by systematic uncertainties due to the fact that the positron spectrometer used in the measurement was designed for another experiment. Thus, the data analysis here focused mainly on the determination of systematic errors.
Advisors/Committee Members: Piilonen, Leo E. (committeechair), Simonetti, John H. (committee member), Kinoshita, Kay (committee member), Abashian, Alexander (committee member), Chang, Lay Nam (committee member).
Subjects/Keywords: Standard Model; V-A Theory; Michel Parameter; Muon Decay
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APA (6th Edition):
Lee, F. (2001). Measurement of the Michel Parameter Rho Using the MEGA Positron Spectrometer. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/26790
Chicago Manual of Style (16th Edition):
Lee, Fei-sheng. “Measurement of the Michel Parameter Rho Using the MEGA Positron Spectrometer.” 2001. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/26790.
MLA Handbook (7th Edition):
Lee, Fei-sheng. “Measurement of the Michel Parameter Rho Using the MEGA Positron Spectrometer.” 2001. Web. 18 Apr 2021.
Vancouver:
Lee F. Measurement of the Michel Parameter Rho Using the MEGA Positron Spectrometer. [Internet] [Doctoral dissertation]. Virginia Tech; 2001. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/26790.
Council of Science Editors:
Lee F. Measurement of the Michel Parameter Rho Using the MEGA Positron Spectrometer. [Doctoral Dissertation]. Virginia Tech; 2001. Available from: http://hdl.handle.net/10919/26790
Virginia Tech
20.
Lai, I Chung.
Measurement of bar{B0} Meson Properties Via Partial Reconstruction of the Decay bar{B0} -> D*+ l- ar{nu}.
Degree: PhD, Physics, 1999, Virginia Tech
URL: http://hdl.handle.net/10919/38697
► Using data recorded by the CLEO II detector operating at the Upsilon(4S) resonance at the Cornell Electron Storage Ring, several properties of B mesons are…
(more)
▼ Using data recorded by the CLEO II detector operating at the
Upsilon(4S) resonance at the Cornell Electron Storage Ring,
several properties of B mesons are measured using a partially
reconstructed tag of the decay mode bar{B0} ->
D*+ l- bar{nu}. Using 2.38 fb**{-1} of on-resonance
data and the averaged B meson semileptonic branching fraction
through inclusive lepton momentum spectrum obtained by previous
CLEO analysis, we measure the B0 and B- semileptonic
branching fraction to be (10.78 +/- 0.60 +/- 0.69)% and
(10.25 +/- 0.57 +/- 0.65)% respectively, which yields the
lifetime ratio tau_+/tau_0 = 0.950 +0.117-0.080 +0.091-0.068,
assuming the equality of semileptonic partial branching width for
bar{B0} and B-. With a larger dataset of 3.1 fb**{-1}, we measured
the B0-bar{B0} mixing parameter chi_d to be 0.189 +/- 0.019 +/- 0.006.
Advisors/Committee Members: Chang, Lay Nam (committee member), Heflin, James R. (committee member), Pitt, Mark L. (committee member), Kinoshita, Kay (committeecochair), Piilonen, Leo E. (committeecochair).
Subjects/Keywords: Mixing; Semileptonic Decay; B Meson
Record Details
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Record Details
Similar Records
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lai, I. C. (1999). Measurement of bar{B0} Meson Properties Via Partial Reconstruction of the Decay bar{B0} -> D*+ l- ar{nu}. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/38697
Chicago Manual of Style (16th Edition):
Lai, I Chung. “Measurement of bar{B0} Meson Properties Via Partial Reconstruction of the Decay bar{B0} -> D*+ l- ar{nu}.” 1999. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/38697.
MLA Handbook (7th Edition):
Lai, I Chung. “Measurement of bar{B0} Meson Properties Via Partial Reconstruction of the Decay bar{B0} -> D*+ l- ar{nu}.” 1999. Web. 18 Apr 2021.
Vancouver:
Lai IC. Measurement of bar{B0} Meson Properties Via Partial Reconstruction of the Decay bar{B0} -> D*+ l- ar{nu}. [Internet] [Doctoral dissertation]. Virginia Tech; 1999. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/38697.
Council of Science Editors:
Lai IC. Measurement of bar{B0} Meson Properties Via Partial Reconstruction of the Decay bar{B0} -> D*+ l- ar{nu}. [Doctoral Dissertation]. Virginia Tech; 1999. Available from: http://hdl.handle.net/10919/38697
Virginia Tech
21.
Mohapatra, Debabrata.
Observation of b to d gamma and determination of |Vtd/Vts|.
Degree: PhD, Physics, 2006, Virginia Tech
URL: http://hdl.handle.net/10919/28129
► The flavor changing neutral current process b -> dγ is a sensitive probe to the Standard Model of elementary particle physics. Using a sample of…
(more)
▼ The flavor changing neutral current process
b -> dγ is a sensitive probe to the Standard Model of elementary particle physics. Using a sample of
386 Ã 106 B meson pairs accumulated by the Belle detector at the KEKB
e+e− collider, we measure the branching fractions for the exclusive modes
B −> ρ−γ, B0 -> ρ0γ and B0 -> ωγ as follows:
B(B −> ρ−γ) = 0.55 +0.42−0.36 +0.09−0.08
B(B0 -> ρ0γ) = 1.25 +0.37−0.33 +0.07−0.06
B(B0 -> ωγ) = 0.56 +0.34−0.27 +0.05−0.10
where the first error on each value is statistical and the second is systematic. Assuming that these three modes are related by isospin conservation
rules, we find the combined branching fraction
B(B -> (ρ, ω)γ) = 1.32 +0.34−0.31 +0.10−0.09 .
This result is used to determine the ratio of CKM matrix elements,
|Vtd/Vts| = 0.199 +0.026−0.025 +0.018−0.015 .
Advisors/Committee Members: Piilonen, Leo E. (committeechair), Ficenec, John R. (committee member), Pitt, Mark L. (committee member), Simonetti, John H. (committee member), Mizutani, Tetsuro (committee member).
Subjects/Keywords: CKM matrix elements; rare B decays; radiative B decays
Record Details
Similar Records
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Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mohapatra, D. (2006). Observation of b to d gamma and determination of |Vtd/Vts|. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/28129
Chicago Manual of Style (16th Edition):
Mohapatra, Debabrata. “Observation of b to d gamma and determination of |Vtd/Vts|.” 2006. Doctoral Dissertation, Virginia Tech. Accessed April 18, 2021.
http://hdl.handle.net/10919/28129.
MLA Handbook (7th Edition):
Mohapatra, Debabrata. “Observation of b to d gamma and determination of |Vtd/Vts|.” 2006. Web. 18 Apr 2021.
Vancouver:
Mohapatra D. Observation of b to d gamma and determination of |Vtd/Vts|. [Internet] [Doctoral dissertation]. Virginia Tech; 2006. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10919/28129.
Council of Science Editors:
Mohapatra D. Observation of b to d gamma and determination of |Vtd/Vts|. [Doctoral Dissertation]. Virginia Tech; 2006. Available from: http://hdl.handle.net/10919/28129
. 
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