Abstract
Transverse momentum (pT ) spectra of charged particles at mid-pseudorapidity in Xe–Xe collisions at sNN=5.44TeV measured with the ALICE apparatus at the Large Hadron Collider are reported. The kinematic range 0.15<pT<50GeV/c and |η|<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 s=5.44 TeV is obtained by interpolating between existing pp measurements at 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 sNN=5.02 TeV, and in addition at 2.76 TeV, at analogous ranges of charged particle multiplicity density 〈dNch/dη〉 show a remarkable similarity at pT>10GeV/c. The centrality dependence of the ratio of the average transverse momentum 〈pT〉 in Xe–Xe collisions over Pb–Pb collision at s=5.02 TeV is compared to hydrodynamical model calculations.
Highlights
Transverse momentum spectra of charged particles carry essential information about the high-density deconfined state of strongly-interacting matter commonly denoted as quark–gluon plasma, that is formed in high-energy nucleus–nucleus (A–A) collisions [1]
At low to intermediate pT, typically in the range of up to 10 GeV/c, charged particle production is governed by the collective expansion of the system, which is observed in the shapes of single-particle transverse-momentum spectra [4,5] and multiparticle correlations [2]
1.1 · 106 minimumbias collisions pass the event selection and were further analyzed. This analysis is based on tracking information from the Inner Tracking System (ITS) [28] and the Time Projection Chamber (TPC) [29] which are located in the central barrel of ALICE
Summary
Transverse momentum (pT) spectra of charged particles carry essential information about the high-density deconfined state of strongly-interacting matter commonly denoted as quark–gluon plasma, that is formed in high-energy nucleus–nucleus (A–A) collisions [1]. The LHC produced for the clei at a center-of-mass energy fiorfs√t stiNmNe=c5o.l4li4sioTenVs of xenon nuduring a pilot run with 6 hours of stable beams in October 2017 5.44 TeV measured with the ALICE apparatus at the LHC in the kinematic range 0.15 < pT < 50 GeV/c and |η| < 0.8 for nine classes of collision centrality, covering the most central 80% of the hadronic cross section. It is organized as follows: Section 2 describes the experimental setup and data analysis.
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