Measurement of nuclear effects on psi(2S) production in p-Pb collisions at sNN = 8.16 TeV
Özet
Inclusive ψ(2S) production is measured in p-Pb collisions at the centre-ofmass energy per nucleon-nucleon pair √sNN = 8.16 TeV, using the ALICE detector at the
CERN LHC. The production of ψ(2S) is studied at forward (2.03 < ycms < 3.53) and
backward (−4.46 < ycms < −2.96) centre-of-mass rapidity and for transverse momentum
pT < 12 GeV/c via the decay to muon pairs. In this paper, we report the integrated as
well as the ycms- and pT-differential inclusive production cross sections. Nuclear effects
on ψ(2S) production are studied via the determination of the nuclear modification factor
that shows a strong suppression at both forward and backward centre-of-mass rapidities.
Comparisons with corresponding results for inclusive J/ψ show a similar suppression for
the two states at forward rapidity (p-going direction), but a stronger suppression for ψ(2S)
at backward rapidity (Pb-going direction). As a function of pT, no clear dependence
of the nuclear modification factor is found. The relative size of nuclear effects on ψ(2S)
production compared to J/ψ is also studied via the double ratio of production cross sections
[σψ(2S)/σJ/ψ]pPb/[σψ(2S)/σJ/ψ]pp between p-Pb and pp collisions. The results are compared
with theoretical models that include various effects related to the initial and final state of
the collision system and also with previous measurements at √sNN = 5.02 TeV.
Koleksiyonlar
DSpace@Karatay by Karatay University Institutional Repository is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 Unported License..