Small-$x$ evolution of gluon fields from incoherent J/$\psi$ photoproduction in ultraperipheral PbPb collisions - INSPIRE

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Small- $x$ evolution of gluon fields from incoherent J/ $\psi$ photoproduction in ultraperipheral PbPb collisions

CMS

Collaboration

Mar 11, 2025

e-Print:

2503.08903 [nucl-ex]

Report number:

CMS-HIN-23-009,
CERN-EP-2025-030

Experiments:

CERN-LHC-CMS

View in:

ADS Abstract Service

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Abstract: (arXiv)

Incoherent J/

\psi

photoproduction in heavy ion ultraperipheral collisions (UPCs), in which the photon interacts with localized, fluctuating gluonic hotspots rather than the entire nucleus, provides a unique probe of those fluctuations. This study presents the first measurement of the dependence of this photoproduction yield on the photon-nucleon center-of-mass energy (

W_\gamma^\mathrm{N}

), using PbPb UPCs at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The data corresponds to an integrated luminosity of 1.52 nb

^{-1}

, recorded by the CMS experiment. The measurement covers a wide

W_\gamma^\mathrm{N}

range of

\approx

40-400 GeV, probing gluons carrying a fraction of nucleon momentum

x

in the range between 5.9

\times

10

^{-3}

and 6.5

\times

10

^{-5}

. The measured incoherent J/

\psi

photoproduction cross section is suppressed relative to theoretical predictions without nuclear effects. However, the ratio of incoherent to coherent photoproduction remains constant across the probed

W_\gamma^\mathrm{N}

and

x

range. Together, these results pose significant challenges to current theoretical models which include gluon saturation or nuclear shadowing effects.

Note:

Submitted to Physical Review Letters. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-23-009 (CMS Public Pages)

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