Centrality and transverse momentum dependence of inclusive J/psi production at midrapidity in Pb–Pb collisions at sNN = 5.02 TeV
Özet
The inclusive J/ψ meson production in Pb–Pb collisions at a center-of-mass energy per nucleon–nucleon
collision of √sNN = 5.02 TeV at midrapidity (|y| < 0.9) is reported by the ALICE Collaboration. The
measurements are performed in the dielectron decay channel, as a function of event centrality and J/ψ
transverse momentum pT, down to pT = 0. The J/ψ mean transverse momentum pT and rAA ratio,
defined as p2
T PbPb/p2
T pp, are evaluated. Both observables show a centrality dependence decreasing
towards central (head-on) collisions. The J/ψ nuclear modification factor RAA exhibits a strong pT
dependence with a large suppression at high pT and an increase to unity for decreasing pT. When
integrating over the measured momentum range pT < 10 GeV/c, the J/ψ RAA shows a weak centrality
dependence. Each measurement is compared with results at lower center-of-mass energies and with
ALICE measurements at forward rapidity, as well as to theory calculations. All reported features of the
J/ψ production at low pT are consistent with a dominant contribution to the J/ψ yield originating from
charm quark (re)combination.
Koleksiyonlar
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