Centrality dependence of J/$\psi$ and $\psi$(2S) production and nuclear modification in p-Pb collisions at $\sqrt{s_{\rm NN}} =$ 8.16 TeV - INSPIRE

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Centrality dependence of J/ $\psi$ and $\psi$ (2S) production and nuclear modification in p-Pb collisions at $\sqrt{s_{\rm NN}} =$ 8.16 TeV

ALICE

Collaboration

Aug 11, 2020

36 pages

Published in:

JHEP 02 (2021) 002

Published: Feb 1, 2021

e-Print:

2008.04806 [nucl-ex]

DOI:

10.1007/JHEP02(2021)002

Report number:

CERN-EP-2020-133

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Springer)

The inclusive production of the J/ψ and ψ(2S) charmonium states is studied as a function of centrality in p-Pb collisions at a centre-of-mass energy per nucleon pair

\sqrt{s_{\mathrm{NN}}}

= 8.16 TeV at the LHC. The measurement is performed in the dimuon decay channel with the ALICE apparatus in the centre-of-mass rapidity intervals −4.46 < y

_{cms}

< −2.96 (Pb-going direction) and 2.03 < y

_{cms}

< 3.53 (p-going direction), down to zero transverse momentum (p

_{T}

). The J/ψ and ψ(2S) production cross sections are evaluated as a function of the collision centrality, estimated through the energy deposited in the zero degree calorimeter located in the Pb-going direction. The p

_{T}

-differential J/ψ production cross section is measured at backward and forward rapidity for several centrality classes, together with the corresponding average 〈p

_{T}

〉 and

\left\langle {p}_{\mathrm{T}}^2\right\rangle

values. The nuclear effects affecting the production of both charmonium states are studied using the nuclear modification factor. In the p-going direction, a suppression of the production of both charmonium states is observed, which seems to increase from peripheral to central collisions. In the Pb-going direction, however, the centrality dependence is different for the two states: the nuclear modification factor of the J/ψ increases from below unity in peripheral collisions to above unity in central collisions, while for the ψ(2S) it stays below or consistent with unity for all centralities with no significant centrality dependence. The results are compared with measurements in p-Pb collisions at

\sqrt{s_{\mathrm{NN}}}

= 5.02 TeV and no significant dependence on the energy of the collision is observed. Finally, the results are compared with theoretical models implementing various nuclear matter effects.[graphic not available: see fulltext]

Note:

32 pages, 11 captioned figures, 3 tables, authors from page 27, version published, figures at http://alice-publications.web.cern.ch/node/6661

Hadron-Hadron scattering (experiments)
J/psi(3100): production
psi(3685): production
p nucleus: scattering
charmonium: production
cross section: measured
nuclear matter: effect
dimuon: decay
calorimeter: forward spectrometer
impact parameter

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