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The Ohio State University

1. Buxton, Jesse Thomas. ΛK and ΞK± Femtoscopy in Pb-Pb Collisions at √<i>s</i>NN = 2.76 TeV from the LHC ALICE Collaboration.

Degree: PhD, Physics, 2019, The Ohio State University

The first measurements of the scattering parameters of ΛK pairs in all three charge combinations (ΛK+, ΛK, and ΛK0S) are presented. The measurements are achieved through a femtoscopic analysis of ΛK correlations in Pb-Pb collisions at √<i>s</i>NN = 2.76 TeV from ALICE at the LHC. The femtoscopic correlations result from strong final-state interactions, and are fit with a parametrization allowing for both the characterization of the pair emission source and the measurement of the scattering parameters for the particle pairs. The fit assumes a common radius and λFit parameter for each centrality bin, shared across all ΛK pair systems. Extensive studies with the THERMINATOR 2 event generator allow for the description of the non-femtoscopic background, resulting mainly from collective effects, with unprecedented precision. Furthermore, this model together with HIJING simulations are used to account for contributions from residual correlations induced by feed-down from resonances. In the experimental data, a striking difference is observed in pairs with low relative momenta (<i>k</i>* ≤ 100 MeV) between the ΛK+ and ΛK correlations, and the ΛK0S system exhibits features between the two. The ΛK+ system exhibits a negative real component of the scattering parameter (ℜ<i>f</i>0), while those of the ΛK and ΛK0S are positive, although the magnitude of that of the ΛK0S is smaller than that of the ΛK. The results suggest an effect arising from different quark-antiquark interactions between the pairs, or from different net strangeness for each system (S=0 for ΛK+, and S=−2 for ΛK). To investigate further, we conduct a ΞK± analysis, for which preliminary results are shown. Finally, the ΛK systems exhibit source radii larger than expected from extrapolation from identical particle femtoscopic studies. This effect is interpreted as resulting from the separation in space-time of the single-particle Λ and K source distributions. Advisors/Committee Members: Humanic, Thomas (Advisor).

Subjects/Keywords: Physics; Femtoscopy; heavy-ion collisions; HBT interferometry

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

APA (6th Edition):

Buxton, J. T. (2019). ΛK and ΞK± Femtoscopy in Pb-Pb Collisions at √<i>s</i>NN = 2.76 TeV from the LHC ALICE Collaboration. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1555596225005443

Chicago Manual of Style (16th Edition):

Buxton, Jesse Thomas. “ΛK and ΞK± Femtoscopy in Pb-Pb Collisions at √<i>s</i>NN = 2.76 TeV from the LHC ALICE Collaboration.” 2019. Doctoral Dissertation, The Ohio State University. Accessed September 21, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555596225005443.

MLA Handbook (7th Edition):

Buxton, Jesse Thomas. “ΛK and ΞK± Femtoscopy in Pb-Pb Collisions at √<i>s</i>NN = 2.76 TeV from the LHC ALICE Collaboration.” 2019. Web. 21 Sep 2019.

Vancouver:

Buxton JT. ΛK and ΞK± Femtoscopy in Pb-Pb Collisions at √<i>s</i>NN = 2.76 TeV from the LHC ALICE Collaboration. [Internet] [Doctoral dissertation]. The Ohio State University; 2019. [cited 2019 Sep 21]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1555596225005443.

Council of Science Editors:

Buxton JT. ΛK and ΞK± Femtoscopy in Pb-Pb Collisions at √<i>s</i>NN = 2.76 TeV from the LHC ALICE Collaboration. [Doctoral Dissertation]. The Ohio State University; 2019. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1555596225005443

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