Suppression and azimuthal anisotropy of prompt and nonprompt ${\mathrm{J}}/\psi $ production in PbPb collisions at $\sqrt{{s_{_{\text {NN}}}}} =2.76$ $\,\mathrm{TeV}$ - INSPIRE

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Suppression and azimuthal anisotropy of prompt and nonprompt ${\mathrm{J}}/\psi$ production in PbPb collisions at $\sqrt{{s_{_{\text {NN}}}}} =2.76$ $\,\mathrm{TeV}$

CMS

Collaboration

Oct 3, 2016

42 pages

Published in:

Eur.Phys.J.C 77 (2017) 4, 252

Published: Apr 19, 2017

e-Print:

1610.00613 [nucl-ex]

DOI:

10.1140/epjc/s10052-017-4781-1

Report number:

CMS-HIN-14-005,
CERN-EP-2016-243

Experiments:

CERN-LHC-CMS

View in:

reference search178 citations

Citations per year

Abstract: (Springer)

The nuclear modification factor

R_{\mathrm{AA}}

and the azimuthal anisotropy coefficient

v_{2}

of prompt and nonprompt (i.e. those from decays of b hadrons)

{\mathrm{J}}/\psi

mesons, measured from PbPb and pp collisions at

\sqrt{{s_{_{\text {NN}}}}} =2.76

\,\mathrm{TeV}

at the LHC, are reported. The results are presented in several event centrality intervals and several kinematic regions, for transverse momenta

p_{\mathrm{T}} >6.5

\,{\mathrm{GeV}}/{\mathrm{c}}

and rapidity

|{y}|<2.4

, extending down to

p_{\mathrm{T}} =3

\,{\mathrm{GeV}}/{\mathrm{c}}

in the

1.6<|{y}|<2.4

range. The

v_{2}

of prompt

{\mathrm{J}}/\psi

is found to be nonzero, but with no strong dependence on centrality, rapidity, or

p_{\mathrm{T}}

over the full kinematic range studied. The measured

v_{2}

of nonprompt

{\mathrm{J}}/\psi

is consistent with zero. The

R_{\mathrm{AA}}

of prompt

{\mathrm{J}}/\psi

exhibits a suppression that increases from peripheral to central collisions but does not vary strongly as a function of either y or

p_{\mathrm{T}}

in the fiducial range. The nonprompt

{\mathrm{J}}/\psi

R_{\mathrm{AA}}

shows a suppression which becomes stronger as rapidity or

p_{\mathrm{T}}

increases. The

v_{2}

and

R_{\mathrm{AA}}

of open and hidden charm, and of open charm and beauty, are compared.

Note:

Replaced with the published version. Added the journal reference and DOI. All the figures and tables, including additional supplemental figures, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-14-005/index.html

J/psi(3100)
charm
bottom
suppression
kinematics
direct production
angular distribution: anisotropy
rapidity
nucleus
heavy ion: scattering

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