Measurement of prompt and nonprompt $\mathrm{J}/{\psi }$ production in $\mathrm {p}\mathrm {p}$ and $\mathrm {p}\mathrm {Pb}$ collisions at $\sqrt{s_{\mathrm {NN}}} =5.02\,\text {TeV} $ - INSPIRE

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Measurement of prompt and nonprompt $\mathrm{J}/{\psi }$ production in $\mathrm {p}\mathrm {p}$ and $\mathrm {p}\mathrm {Pb}$ collisions at $\sqrt{s_{\mathrm {NN}}} =5.02\,\text {TeV}$

CMS

Collaboration

Feb 5, 2017

40 pages

Published in:

Eur.Phys.J.C 77 (2017) 4, 269

Published: Apr 27, 2017

e-Print:

1702.01462 [nucl-ex]

DOI:

10.1140/epjc/s10052-017-4828-3

Report number:

CMS-HIN-14-009,
CERN-EP-2017-009

Experiments:

CERN-LHC-CMS

View in:

reference search95 citations

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Abstract: (Springer)

This paper reports the measurement of

\mathrm{J}/{\psi }

meson production in proton–proton (

\mathrm {p}\mathrm {p}

) and proton–lead (

\mathrm {p}\mathrm {Pb}

) collisions at a center-of-mass energy per nucleon pair of

5.02\,\text {TeV}

by the CMS experiment at the LHC. The data samples used in the analysis correspond to integrated luminosities of 28

\,\text {pb}^{-1}

and 35

\,\text {nb}^{-1}

for

\mathrm {p}\mathrm {p}

and

\mathrm {p}\mathrm {Pb}

collisions, respectively. Prompt and nonprompt

\mathrm{J}/{\psi }

mesons, the latter produced in the decay of

{\mathrm {B}}

hadrons, are measured in their dimuon decay channels. Differential cross sections are measured in the transverse momentum range of

2<p_{\mathrm {T}} <30{\,\text {GeV}/{c}}

, and center-of-mass rapidity ranges of

|y_\mathrm{{CM}} |<2.4

(

\mathrm {p}\mathrm {p}

) and

-2.87<y_\mathrm{{CM}}<1.93

(

\mathrm {p}\mathrm {Pb}

). The nuclear modification factor,

R_{\mathrm {p}\mathrm {Pb}}

, is measured as a function of both

p_{\mathrm {T}}

and

y_\mathrm{{CM}}

. Small modifications to the

\mathrm{J}/{\psi }

cross sections are observed in

\mathrm {p}\mathrm {Pb}

relative to

\mathrm {p}\mathrm {p}

collisions. The ratio of

\mathrm{J}/{\psi }

production cross sections in

\mathrm {p}

-going and Pb-going directions,

R_\mathrm{{FB}}

, studied as functions of

p_{\mathrm {T}}

and

y_\mathrm{{CM}}

, shows a significant decrease for increasing transverse energy deposited at large pseudorapidities. These results, which cover a wide kinematic range, provide new insight on the role of cold nuclear matter effects on prompt and nonprompt

\mathrm{J}/{\psi }

production.

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-14-009/index.html

J/psi(3100): production
psi mesons: direct production
B: decay
dimuon: decay
differential cross section
transverse momentum
transverse energy
rapidity
nuclear matter: effect
suppression

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