Szczegóły publikacji
Opis bibliograficzny
Evidence of spin-interference effects in exclusive $J/\psi \to e^{+}e^{-}$ photoproduction in ultraperipheral heavy-ion collisions / B. E. Aboona, [et al.], L. ADAMCZYK, [et al.], S. R. BHOSALE, [et al.], M. PRZYBYCIEŃ, [et al.], A. J. WĄTROBA, [et al.] // Physical Review Letters ; ISSN 0031-9007 . — 2026 — vol. 136 iss. 24 art. no. 242302, s. 242302-1–242302-8. — Bibliogr. s. 242302-8, Abstr. — Publikacja dostępna online od: 2026-06-17
Autorzy (384)
Dane bibliometryczne
| ID BaDAP | 168811 |
|---|---|
| Data dodania do BaDAP | 2026-08-06 |
| Tekst źródłowy | URL |
| DOI | 10.1103/tcdb-ldh8 |
| Rok publikacji | 2026 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Physical Review Letters |
Abstract
We report the first evidence of spin interference in exclusive 𝐽/𝜓→𝑒+𝑒− photoproduction in ultraperipheral heavy-ion collisions at STAR at √𝑠𝑁𝑁=200 GeV. In Au+Au collisions, a negative cos(2𝜙) modulation is found for 𝑝𝑇<120 MeV/𝑐 with a significance of 3.2𝜎, while the isobar data (Ru+Ru, Zr+Zr) show a consistent negative modulation with a significance of 1.9𝜎, opposite in sign to that in 𝜌0 →𝜋+𝜋− photoproduction. This establishes for the first time that the interference sign is controlled by the spin structure of the final-state daughters, resolving the ambiguity present in the all-boson 𝜌0 channel. The compact 𝐽/𝜓 probes gluon distributions at perturbative scales, resulting in a weaker modulation and providing stringent constraints on color glass condensate calculations. These findings demonstrate that spin-dependent interference in heavy vector mesons provides a new, experimentally accessible handle on gluon structure beyond traditional cross-section measurements.
