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Observation of the charged-particle multiplicity dependence of σ_{ψ(2S)}/σ_{J/ψ} in pPb collisions at 8.16 TeVстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 1 октября 2025 г.
- Авторы: Boos E.E., Ershov A.A., A Gribushin, Kaminskiy A., Khein L., Kodolova O.L., Korotkikh V.L., Obraztsov S.V., 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: 092301
- DOI: 10.1103/c9wp-5tq3
- Аннотация: Bound states of charm and anticharm quarks, known as charmonia, have a rich spectroscopic structurethat can be used to probe the dynamics of hadron production in high-energy hadron collisions. Here, the cross section ratio of excited ðψð2SÞÞ and ground state ðJ=ψÞ vector mesons is measured as a function of the charged-particle multiplicity in proton-lead (pPb) collisions at a center-of-mass (CM) energy per nucleon pair of 8.16 TeV. The data corresponding to an integrated luminosity of 175 nb−1 were collected using the CMS detector. The ratio is measured separately for prompt and nonprompt charmonia in the transverse momentum range 6.5 < pT < 30 GeV and in four rapidity ranges spanning −2.865 < yCM < 1.935. For the first time, a statistically significant multiplicity dependence of the prompt cross section ratio is observed in proton-nucleus collisions. There is no clear rapidity dependence in the ratio. The prompt measurements are compared with a theoretical model which includes interactions with nearby particles during the evolution of the system. These results provide additional constraints on hadronization models of heavy quarks in nuclear collisions.
- Добавил в систему: Петрушанко Сергей Владимирович
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