Szczegóły publikacji
Opis bibliograficzny
Observation of the charged-particle multiplicity dependence of $\sigma_{\psi(2S)}/\sigma_{J/\psi}$ in $p-Pb$ Collisions at 8.16 TeV / V. Chekhovsky, [et al.], V. AVATI, A. BELLORA, L. FORTHOMME, L. GRZANKA, M. MALAWSKI, K. PIOTRZKOWSKI, [et al.] // Physical Review Letters ; ISSN 0031-9007 . — 2025 — vol. 135 iss. 9 art. no. 092301, s. 092301-1–092301-22. — Bibliogr. s. 092301-6–092301-8, Abstr. — Publikacja dostępna online od: 2025-08-25
Autorzy (2381)
Dane bibliometryczne
| ID BaDAP | 162766 |
|---|---|
| Data dodania do BaDAP | 2025-09-22 |
| Tekst źródłowy | URL |
| DOI | 10.1103/c9wp-5tq3 |
| Rok publikacji | 2025 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Physical Review Letters |
Abstract
Bound states of charm and anticharm quarks, known as charmonia, have a rich spectroscopic structure that can be used to probe the dynamics of hadron production in high-energy hadron collisions. Here, the cross section ratio of excited (𝜓(2𝑆)) and ground state (𝐽/𝜓) 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.
