Szczegóły publikacji
Opis bibliograficzny
Probing gluon fluctuations in nuclei with the first energy-dependent measurement of incoherent $J/\psi$ photoproduction in ultraperipheral PbPb collisions / 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. 11 art. no. 112301, s. 112301-1–112301-22. — Bibliogr. s. 112301-6–112301-8, Abstr. — Publikacja dostępna online od: 2025-09-09
Autorzy (2381)
Dane bibliometryczne
| ID BaDAP | 162770 |
|---|---|
| Data dodania do BaDAP | 2025-09-22 |
| Tekst źródłowy | URL |
| DOI | 10.1103/w9kp-f8xr |
| Rok publikacji | 2025 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp | |
| Creative Commons | |
| Czasopismo/seria | Physical Review Letters |
Abstract
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 (𝑊𝛾N ) 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 𝑊𝛾N 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 𝑊𝛾N 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.