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Observation of Coherent ϕ(1020) Meson Photoproduction in Ultraperipheral PbPb Collisions at √s_NN = 5.36 TeVстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Boos E., Ershov A.A., Gribushin A., Khein L., Klyukhin, Kodolova O., Korotkikh V., Petrushanko, Savrin V., Snigirev A., Vardanyan I., CMS Collaboration
- Журнал: Physical Review Letters
- Том: 135
- Номер: 26
- Год издания: 2025
- Издательство: American Physical Society
- Местоположение издательства: United States
- Первая страница: 262301
- DOI: 10.1103/2ssw-wwyy
- Аннотация: The first observation of coherent ϕð1020Þ meson photoproduction off heavy nuclei is presented using ultraperipheral lead-lead collisions at a center-of-mass energy per nucleon pair of 5.36 TeV. The data were collected by the CMS experiment and correspond to an integrated luminosity of 1.62 μb−1. The ϕ(1020) meson signals are reconstructed via the K+K− decay channel. The production cross section is presented as a function of the ϕð1020Þ meson rapidity in the range 0.3 < |y| < 1.0, probing gluons that carry a fraction of the nucleon momentum (x) around 10^−4. The observed cross section exhibits little dependence on rapidity and is significantly suppressed, by a factor of ∼5, compared to a baseline model that treats a nucleus as a collection of free nucleons. Theoretical models that incorporate the nuclear shadowing effect generally provide a better description of the ϕ(1020) data than those incorporating gluon saturation. This study establishes a powerful new tool for exploring nuclear effects and nuclear gluonic structure in the small-x regime at a unique energy scale bridging the perturbative and nonperturbative quantum chromodynamics domains.
- Добавил в систему: Клюхин Вячеслав Иванович
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