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Transverse momentum spectra and nuclear modification factors of charged particles in Xe-Xe collisions at √sNN = 5.44 TeV

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 pT<0.15, 50>GeV/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>10 GeV/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.

transverse momentum ; momentum spectrum ; charged particle multiplicity ; charged particle: spectrum ; path length: dependence ; multiplicity: density ; model hydrodynamics ; parton energy loss ; heavy ion: scattering ; nucleus ; CERN LHC Coll ; kinematics ; ALICE

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