Transverse momentum spectra and nuclear modification factors of charged particles in Xe-Xe collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.44 TeV

Abstract

Transverse momentum ($p_{\mathrm{T}}$) spectra of charged particles at mid-pseudorapidity in Xe-Xe collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.44 TeV measured with the ALICE apparatus at the Large Hadron Collider are reported. The kinematic range $0.15<p_{\mathrm{T}}<50$ GeV/$c$ and $|\eta |<0.8$ is covered. Results are presented in nine classes of collision centrality in the 0-80% range. For comparison, a pp reference at the collision energy of $\sqrt{s}$ = 5.44 TeV is obtained by interpolating between existing \pp measurements at $\sqrt{s}$ = 5.02 and 7 TeV. The nuclear modification factors in central Xe-Xe collisions and Pb-Pb collisions at a similar center-of-mass energy of $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV, and in addition at 2.76 TeV, at analogous ranges of charged particle multiplicity density $⟨\mathrm{d}{\mathrm{N}}_{\mathrm{ch}}/\mathrm{d}\eta ⟩$ show a remarkable similarity at $p_{\mathrm{T}}>10$ GeV/$c$. The centrality dependence of the ratio of the average transverse momentum $⟨p_{\mathrm{T}}⟩$ in Xe-Xe collisions over Pb-Pb collision at $\sqrt{s}$ = 5.02 TeV is compared to hydrodynamical model calculations.

49 pages, 7 captioned figures, 2 tables, authors from page 43, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/4289

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