Abstract
In late 2015, the ALICE collaboration recorded data from Pb–Pb collisions at the unprecedented energy of sNN=5.02 TeV. The transverse-momentum (pT) spectra of pions, kaons and protons are presented. The evolution of the particle ratios as a function of collision energy and centrality is discussed. The ratio between pT-integrated particle yields are measured and compared to different collision energies as well as smaller collision systems. For the study of energy loss mechanisms in the QCD medium at high transverse momenta, the nuclear modification factors (RAA) are computed and compared with results obtained at lower energy.
Highlights
The ultimate goal of heavy-ion physics is the study of the properties of the Quark-Gluon Plasma (QGP), a de-confined and chirally restored state of matter
The measurement of the transverse momentum spectra ofidentified particles provides a solid understanding of the collective properties and of the particle production in the fireball created in heavy-ion collisions which is necessary for the correct interpretation of many signatures of QGP creation
ALICE Collaboration measured as a function has presented the results on the production of the event centrality in Pb–Pb collisions at
Summary
The ultimate goal of heavy-ion physics is the study of the properties of the Quark-Gluon Plasma (QGP), a de-confined and chirally restored state of matter. The measurement of the transverse momentum (pT) spectra of (un-)identified particles provides a solid understanding of the collective properties and of the particle production in the fireball created in heavy-ion collisions which is necessary for the correct interpretation of many signatures of QGP creation. The ALICE experiment [1, 2] is well suited to study the production of both identified and unidentified charged particles thanks to its excellent tracking performance coupled with extensive particle identification (PID) capabilities over a wide range of transverse momentum. The Inner Tracking System (ITS) and the Time Projection Chamber (TPC) detectors allow one to identify particles in the lower pT region (starting from 100 MeV/c) by measuring their specific energy loss. The relativistic rise of the energy loss in the TPC gas can be used to further separate different particle species up to 12 GeV/c
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