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ΛK and ΞK± Femtoscopy in Pb-Pb Collisions at √sNN = 2.76 TeV from the LHC ALICE Collaboration

Buxton, Jesse Thomas

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2019, Doctor of Philosophy, Ohio State University, Physics.
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 √sNN = 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 (k* ≤ 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 (ℜf0), 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.
Thomas Humanic (Advisor)
Michael Lisa (Committee Member)
Ulrich Heinz (Committee Member)
Fengyuan Yang (Committee Member)
275 p.

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Citations

  • Buxton, J. T. (2019). ΛK and ΞK± Femtoscopy in Pb-Pb Collisions at √sNN = 2.76 TeV from the LHC ALICE Collaboration [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555596225005443

    APA Style (7th edition)

  • Buxton, Jesse. ΛK and ΞK± Femtoscopy in Pb-Pb Collisions at √sNN = 2.76 TeV from the LHC ALICE Collaboration. 2019. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1555596225005443.

    MLA Style (8th edition)

  • Buxton, Jesse. "ΛK and ΞK± Femtoscopy in Pb-Pb Collisions at √sNN = 2.76 TeV from the LHC ALICE Collaboration." Doctoral dissertation, Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555596225005443

    Chicago Manual of Style (17th edition)