Measurement of cold nuclear matter effects for inclusive J/ψ in p+Au collisions at sNN=200 GeV - INSPIRE

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Measurement of cold nuclear matter effects for inclusive J/ψ in p+Au collisions at sNN=200 GeV

STAR

Collaboration

Oct 18, 2021

31 pages

Published in:

Phys.Lett.B 825 (2022) 136865

Published: Feb 10, 2022

e-Print:

2110.09666 [nucl-ex]

DOI:

10.1016/j.physletb.2021.136865 (publication)

Experiments:

BNL-RHIC-STAR

View in:

ADS Abstract Service

reference search15 citations

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Abstract: (Elsevier B.V.)

Measurement by the STAR experiment at RHIC of the cold nuclear matter (CNM) effects experienced by inclusive

J / ψ

at mid-rapidity in 0-100% p+Au collisions at

\sqrt{s_{_{NN}}}

= 200 GeV is presented. Such effects are quantified utilizing the nuclear modification factor,

R_{p Au}

, obtained by taking a ratio of

J / ψ

yield in p+Au collisions to that in p+p collisions scaled by the number of binary nucleon-nucleon collisions. The differential

J / ψ

yield in both p+p and p+Au collisions is measured through the dimuon decay channel, taking advantage of the trigger capability provided by the Muon Telescope Detector in the RHIC 2015 run. Consequently, the

J / ψ

R_{p Au}

is derived within the transverse momentum (

p_{T}

) range of 0 to 10 GeV/c. A suppression of approximately 30% is observed for

p_{T} < 2

GeV/c, while

J / ψ

R_{p Au}

becomes compatible with unity for

p_{T}

greater than 3 GeV/c, indicating the

J / ψ

yield is minimally affected by the CNM effects at high

p_{T}

. Comparison to a similar measurement from 0-20% central Au+Au collisions reveals that the observed strong

J / ψ

suppression above 3 GeV/c is mostly due to the hot medium effects, providing strong evidence for the formation of the quark-gluon plasma in these collisions. Several model calculations show qualitative agreement with the measured

J / ψ

R_{p Au}

, while their agreement with the

J / ψ

yields in p+p and p+Au collisions is worse.

Note:

5 figures

RHIC
Cold nuclear matter effects
suppression
cold nuclear matter effects
J/ψ suppression
quark gluon: plasma
nuclear matter: effect
muon: detector
p p: scattering
matter: effect

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