Probing Gluon Fluctuations in Nuclei with the First Energy-Dependent Measurement of Incoherent 𝐽/𝜓 Photoproduction in Ultraperipheral PbPb Collisions

Boos, E.E.; Ershov, A.A.; A, G.; Khein, L.; Kodolova, O.L.; Korotkikh, V.L.; Lukina, O.; Petrushanko, S.V.; Savrin, V.I.; Snigirev, A.M.; Vardanyan, I.; CMS, C.

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Дата последнего поиска статьи во внешних источниках: 8 октября 2025 г.

Авторы: Boos E.E., Ershov A.A., A Gribushin, Khein L., Kodolova O.L., Korotkikh V.L., Lukina O., Petrushanko S.V., Savrin V.I., Snigirev A.M., Vardanyan I., CMS Collaboration
Журнал: Physical Review Letters
Том: 135
Год издания: 2025
Издательство: American Physical Society
Местоположение издательства: United States
Номер статьи: 112301
DOI: 10.1103/w9kp-f8xr
Аннотация: Incoherent 𝐽/𝜓 photoproduction in heavy ion ultraperipheral collisions (UPCs) provides a sensitive probe of localized, fluctuating gluonic structures within heavy nuclei. This Letter reports the first measurement of the photon-nucleon center-of-mass energy (𝑊𝛾⁢N) dependence of this process in PbPb UPCs at a nucleon-nucleon center-of-mass energy of 5.02 TeV, using 1.52 nb−1 of data recorded by the CMS experiment. The measurement covers a wide 𝑊𝛾⁢N range of ≈40–400 GeV, probing gluons carrying a fraction 𝑥 of nucleon momentum down to an unexplored regime of 6.5 ×10−5. Compared to baseline predictions neglecting nuclear effects, the measured cross sections exhibit significantly greater suppression at lower 𝑥. Additionally, the ratio of incoherent to coherent photoproduction is found to be constant across the probed 𝑊𝛾⁢N and 𝑥 range, disfavoring the establishment of the black disk limit. This Letter provides critical insights into the 𝑥-dependent evolution of fluctuating gluonic structures within nuclei and calls for further advancements in theoretical models incorporating nuclear shadowing and gluon saturation.
Добавил в систему: Петрушанко Сергей Владимирович

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Probing Gluon Fluctuations in Nuclei with the First Energy-Dependent Measurement of Incoherent 𝐽/𝜓 Photoproduction in Ultraperipheral PbPb Collisionsстатья Исследовательская статья

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