A1 Journal article (refereed)
First Measurement of the |t| Dependence of Incoherent J/ψ Photonuclear Production (2024)

ALICE collaboration. (2024). First Measurement of the |t| Dependence of Incoherent J/ψ Photonuclear Production. Physical Review Letters, 132(16), Article 162302. https://doi.org/10.1103/PhysRevLett.132.162302

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Publication details

All authors or editors: ALICE collaboration

Journal or series: Physical Review Letters

ISSN: 0031-9007

eISSN: 1079-7114

Publication year: 2024

Publication date: 19/04/2024

Volume: 132

Issue number: 16

Article number: 162302

Publisher: American Physical Society (APS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevLett.132.162302

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published: https://arxiv.org/abs/2305.06169

Abstract

The first measurement of the cross section for incoherent photonuclear production of J/ψ vector meson as a function of the Mandelstam |t| variable is presented. The measurement was carried out with the ALICE detector at midrapidity, |y|<0.8, using ultra-peripheral collisions of Pb nuclei at a centre-of-mass energy per nucleon pair √sNN=5.02 TeV. This rapidity interval corresponds to a Bjorken-x range (0.3−1.4)×10−3. Cross sections are reported in five |t| intervals in the range 0.04<|t|<1~GeV2 and compared to the predictions of different models. Models that ignore quantum fluctuations of the gluon density in the colliding hadron predict a |t|-dependence of the cross section much steeper than in data. The inclusion of such fluctuations in the same models provides a better description of the data.

Keywords: particle physics; nuclear physics

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Ministry reporting: Yes

Reporting Year: 2024

Preliminary JUFO rating: 3