Abstract
The ALICE Collaboration has measured ϕ meson production in the dimuon channel at the forward rapidity (2.5 < y < 4) in pp and Pb–Pb collisions at several center of mass energies. Results in pp collisions at center of mass energies √s = 5.02 and 8 TeV are reported. They complement the previously published results at √s = 2.76 and √s = 7 TeV, providing a solid baseline for Pb–Pb collisions. In Pb–Pb, the preliminary ϕ meson transverse momentum spectra for different centrality classes and the yields as a function of the collision centrality in the transverse momentum range 2 < pT < 7 GeV/c are presented.
Highlights
Quantum Chromodynamics predicts the occurrence of a phase transition from hadronic matter to a plasma of deconfined quarks and gluons, the Quark-Gluon Plasma (QGP), at extreme conditions of temperature and energy density
The measurement at forward rapidity was performed using the muon spectrometer, that covers the pseudorapidity range −4 < η < −2.51. It consists of a hadron absorber, five tracking stations, each one composed of two cathode pad chambers, for the track reconstruction in a dipole magnetic field, an iron wall acting as a muon filter and two stations of two resistive plate chambers for the muon trigger
Muon tracks were selected requesting that the tracks reconstructed in the tracking stations matched the ones in the trigger chambers and
Summary
Quantum Chromodynamics predicts the occurrence of a phase transition from hadronic matter to a plasma of deconfined quarks and gluons, the Quark-Gluon Plasma (QGP), at extreme conditions of temperature and energy density. ALICE has measured vector meson production in pp and Pb–Pb collisions at the LHC. The measurement at forward rapidity was performed using the muon spectrometer, that covers the pseudorapidity range −4 < η < −2.51. The muon trigger introduces a set at ∼ 0.5 GeV/c in pp coll√isions and in Pb–Pb collisions at sNN
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