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You searched for +publisher:"University of Notre Dame" +contributor:("Antonio Delgado, Research Director"). Showing records 1 – 2 of 2 total matches.

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University of Notre Dame

1. Carlos Alvarado. Phenomenology beyond the Standard Model: Models for R-Symmetric Charginos, Flavored Dark Matter, and Higgs Lepton Flavor Violation</h1>.

Degree: Physics, 2018, University of Notre Dame

In this thesis work, I present three extensions of the Standard Model, corresponding to three independent attempts to improve our understanding of dark matter and Large Hadron Collider data in terms of new physics. The first work studies the chargino superparticle in the R-symmetric Minimal Supersymmetric Standard Model, an extension known to improve results regarding the hierarchy problem of the Minimal Supersymmetric Standard Model. In a regime where the lightest superparticles are the chargino and the gravitino, I explore the parameter space in order to determine collider-viable regions for their masses that simultaneously respect the 125 GeV Higgs and squark mass limits. The second work is a dark matter model where the dark candidate carries a flavor charge and couples to two scalar mediators. These two scalars are conventionally used in the Froggatt-Nielsen class of flavor models to explain the mass sizes and mixings of quarks and leptons. The trademark of the model is that dark matter reaches its abundance mostly through annihilation into a pair of distinct mediators, with meson mixing observables imposing stronger constraints than current direct detection prospects. The third model was designed as a means to reproduce the Higgs-to-tau-and-mu excess seen in the proton-proton collisions at the Large Hadron Collider. The approach involved four-fermion interactions between SM leptons and two different vectorlike fermions, which needed to be as heavy as tens-of-TeV in order to simultaneously satisfy such excess and the limits in other flavor-violating processes. Advisors/Committee Members: Antonio Delgado, Research Director.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Alvarado, C. (2018). Phenomenology beyond the Standard Model: Models for R-Symmetric Charginos, Flavored Dark Matter, and Higgs Lepton Flavor Violation</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/7079571590x

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Alvarado, Carlos. “Phenomenology beyond the Standard Model: Models for R-Symmetric Charginos, Flavored Dark Matter, and Higgs Lepton Flavor Violation</h1>.” 2018. Thesis, University of Notre Dame. Accessed January 15, 2021. https://curate.nd.edu/show/7079571590x.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Alvarado, Carlos. “Phenomenology beyond the Standard Model: Models for R-Symmetric Charginos, Flavored Dark Matter, and Higgs Lepton Flavor Violation</h1>.” 2018. Web. 15 Jan 2021.

Vancouver:

Alvarado C. Phenomenology beyond the Standard Model: Models for R-Symmetric Charginos, Flavored Dark Matter, and Higgs Lepton Flavor Violation</h1>. [Internet] [Thesis]. University of Notre Dame; 2018. [cited 2021 Jan 15]. Available from: https://curate.nd.edu/show/7079571590x.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alvarado C. Phenomenology beyond the Standard Model: Models for R-Symmetric Charginos, Flavored Dark Matter, and Higgs Lepton Flavor Violation</h1>. [Thesis]. University of Notre Dame; 2018. Available from: https://curate.nd.edu/show/7079571590x

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of Notre Dame

2. Bryan Ostdiek. Searching for Electroweakino Dark Matter at a Hadron Collider</h1>.

Degree: Physics, 2016, University of Notre Dame

Supersymmetry with R parity provides a stable dark matter candidate. However, over much of the parameter space, the dark matter candidate does not freeze out to the observed relic abundance. One method to achieve the observed relic abundance relies on the co-annihilation of multiple, nearly-degenerate electroweakino states. This so-called well tempering evades traditional collider searches because the compressed spectrum leaves soft decay products. I outline new strategies that takes advantage of this compressed spectrum and estimate its usefulness at the LHC and a future 100 TeV collider. The first strategy is based on final states with missing transverse energy, a photon, and a dilepton pair, \slashed{E}T + γ + ℓ+-. This search method performs best when the mass splitting between the heavier neutralinos and the lightest neutralino is less than the Z mass, which is when traditional search strategies break down. Using this new method, I find the LHC could discover a mixed bino-Higgsino with m\ ilde{χ2,30} ≤ sssim 190 ~ ≥ v and m\ ilde{χ2,30} - m ilde{χ10} ∼eq 30~ ≥ v with 600 fb-1 of 14 TeV data. While the signature of this signal is quite distinct from the backgrounds, triggering is the biggest set-back. Requiring an additional hard jet from initial (or final) state radiation can provide a trigger at the cost of signal rate. I explore the effects of boosting the electroweakinos off a hard jet at a 100~ ev collider; the background leptons and photons recoil proportional to the momentum of the jet, while the signal leptons and photons have momentum proportional to the mass splitting. A 100~ ev collider would provide a unique search strategy where one uses the most energetic machine to look for low energy events. In addition, I also examine an extension to the minimal supersymmetric standard model. This addition adds three SU(2)L triplet chiral superfields with Y=0,±1 and the superpotential respects a global SU(2)L \otimes SU(2)R broken only by the Yukawa interactions. The F terms from these extra fields help raise the mass of the Higgs to the observed value. Meanwhile, if the vacuum mantains the global SU(2)L \otimes SU(2)R, up to the ratio of the doublet vacuum expectation values, the ho parameter is protected at tree level. This allows for the triplet scalars to be light which opens the possibility of resonant s-channel funnels to set the observed relic abundance of dark matter. I show over a wide range of parameters that the triplets can help to set the dark matter abundance either through the s-channel funnels or well tempering with the bino. Advisors/Committee Members: Dinshaw Balsara, Committee Member, Chris Kolda, Committee Member, Michael Hildreth, Committee Member, Antonio Delgado, Research Director.

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Ostdiek, B. (2016). Searching for Electroweakino Dark Matter at a Hadron Collider</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/2801pg1768w

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Ostdiek, Bryan. “Searching for Electroweakino Dark Matter at a Hadron Collider</h1>.” 2016. Thesis, University of Notre Dame. Accessed January 15, 2021. https://curate.nd.edu/show/2801pg1768w.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Ostdiek, Bryan. “Searching for Electroweakino Dark Matter at a Hadron Collider</h1>.” 2016. Web. 15 Jan 2021.

Vancouver:

Ostdiek B. Searching for Electroweakino Dark Matter at a Hadron Collider</h1>. [Internet] [Thesis]. University of Notre Dame; 2016. [cited 2021 Jan 15]. Available from: https://curate.nd.edu/show/2801pg1768w.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ostdiek B. Searching for Electroweakino Dark Matter at a Hadron Collider</h1>. [Thesis]. University of Notre Dame; 2016. Available from: https://curate.nd.edu/show/2801pg1768w

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.