ΛK and Ξ<sup>−</sup>K<sup>±</sup> Femtoscopy in Pb-Pb Collisions at √<i>s</i><sub>NN</sub> = 2.76 TeV from the LHC ALICE Collaboration

ΛK and Ξ<sup>−</sup>K<sup>±</sup> Femtoscopy in Pb-Pb Collisions at √<i>s</i><sub>NN</sub> = 2.76 TeV from the LHC ALICE Collaboration

Bibliographic Details
Main Author: Buxton, Jesse Thomas
Language:English
Published: The Ohio State University / OhioLINK 2019
Subjects:
Physics
Femtoscopy
heavy-ion collisions
HBT interferometry
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=osu1555596225005443
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-osu15555962250054432021-08-03T07:10:29Z ΛK and Ξ<sup>−</sup>K<sup>±</sup> Femtoscopy in Pb-Pb Collisions at √<i>s</i><sub>NN</sub> = 2.76 TeV from the LHC ALICE Collaboration Buxton, Jesse Thomas Physics Femtoscopy heavy-ion collisions HBT interferometry The first measurements of the scattering parameters of ΛK pairs in all three charge combinations (ΛK<sup>+</sup>, ΛK<sup>−</sup>, and ΛK<sup>0</sup><sub>S</sub>) are presented. The measurements are achieved through a femtoscopic analysis of ΛK correlations in Pb-Pb collisions at √<i>s</i><sub>NN</sub> = 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 λ<sub>Fit</sub> 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<sup>+</sup> and ΛK<sup>−</sup> correlations, and the ΛK<sup>0</sup><sub>S</sub> system exhibits features between the two. The ΛK<sup>+</sup> system exhibits a negative real component of the scattering parameter (ℜ<i>f</i><sub>0</sub>), while those of the ΛK<sup>−</sup> and ΛK<sup>0</sup><sub>S</sub> are positive, although the magnitude of that of the ΛK<sup>0</sup><sub>S</sub> is smaller than that of the ΛK<sup>−</sup>. 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<sup>+</sup>, and S=−2 for ΛK<sup>−</sup>). To investigate further, we conduct a Ξ<sup>−</sup>K<sup>±</sup> 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. 2019-08-29 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1555596225005443 http://rave.ohiolink.edu/etdc/view?acc_num=osu1555596225005443 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Physics
Femtoscopy
heavy-ion collisions
HBT interferometry
spellingShingle Physics
Femtoscopy
heavy-ion collisions
HBT interferometry
Buxton, Jesse Thomas
ΛK and Ξ<sup>−</sup>K<sup>±</sup> Femtoscopy in Pb-Pb Collisions at √<i>s</i><sub>NN</sub> = 2.76 TeV from the LHC ALICE Collaboration
author Buxton, Jesse Thomas
author_facet Buxton, Jesse Thomas
author_sort Buxton, Jesse Thomas
title ΛK and Ξ<sup>−</sup>K<sup>±</sup> Femtoscopy in Pb-Pb Collisions at √<i>s</i><sub>NN</sub> = 2.76 TeV from the LHC ALICE Collaboration
title_short ΛK and Ξ<sup>−</sup>K<sup>±</sup> Femtoscopy in Pb-Pb Collisions at √<i>s</i><sub>NN</sub> = 2.76 TeV from the LHC ALICE Collaboration
title_full ΛK and Ξ<sup>−</sup>K<sup>±</sup> Femtoscopy in Pb-Pb Collisions at √<i>s</i><sub>NN</sub> = 2.76 TeV from the LHC ALICE Collaboration
title_fullStr ΛK and Ξ<sup>−</sup>K<sup>±</sup> Femtoscopy in Pb-Pb Collisions at √<i>s</i><sub>NN</sub> = 2.76 TeV from the LHC ALICE Collaboration
title_full_unstemmed ΛK and Ξ<sup>−</sup>K<sup>±</sup> Femtoscopy in Pb-Pb Collisions at √<i>s</i><sub>NN</sub> = 2.76 TeV from the LHC ALICE Collaboration
title_sort λk and ξ<sup>−</sup>k<sup>±</sup> femtoscopy in pb-pb collisions at √<i>s</i><sub>nn</sub> = 2.76 tev from the lhc alice collaboration
publisher The Ohio State University / OhioLINK
publishDate 2019
url http://rave.ohiolink.edu/etdc/view?acc_num=osu1555596225005443
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