| Thesis | |
| Report number | CERN-THESIS-2015-112 |
| Title | $\mathrm{K}^{0}_\mathrm{S}$ and $\Lambda$ production associated to high-$p_\mathrm{T}$ particles in Pb-Pb collisions at $\sqrt{s_\mathrm{NN}}$ = 2.76 TeV with ALICE : Comparison between soft- and hard-processes in hadron production |
| Author(s) | Sanchez Castro, Xitzel (Strasbourg, IPHC) |
| Publication | 190. |
| Thesis note | PhD : Strasbourg U. : 2015-06-18 |
| Thesis supervisor(s) | Kuhn, Christian |
| Note | Presented 31 Mar 2015 |
| Subject category | Nuclear Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LHC ; ALICE |
| Abstract | In ultrarelativistic heavy-ion collisions, the QCD matter is under extreme conditions of energy density, forming a quark-gluon plasma (QGP), in which quarks and gluons are deconfined. At RHIC and LHC energies, a large baryon-to-meson ratio, like $\Lambda/\mathrm{K}^{0}_\mathrm{S}$, was observed within the transverse momentum range $2 < p_\mathrm{T} < 6$ GeV/$c$ for central heavy-ion collisions. The goal of this dissertation is to verify if the baryon-to-meson enhancement is only due to collective effects of the bulk of matter, and if there is also a contribution related to in-medium modifications of parton fragmentation. With two-hadron angular correlations, the $\mathrm{K}^{0}_\mathrm{S}$ and $\Lambda$ produced in association to an energetic hadron (hard processes) are separated from those originated from the thermalised medium (soft processes). The differential $\Lambda/\mathrm{K}^{0}_\mathrm{S}$ ratios related to the soft or hard production processes are extracted. The results are obtained for the Pb--Pb collisions at $\sqrt{s_\mathrm{NN}}$= 2.76 TeV recorded in 2011 with the ALICE experiment. Keywords: heavy-ion collisions, quark-gluon plasma, ALICE, baryon-to-meson ratio, hard processes, parton fragmentation, thermalised medium, bulk. |
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Zapis kreiran 2015-08-13, zadnja izmjena 2019-06-03
