Szczegóły publikacji
Opis bibliograficzny
Observation of excess $J/\psi$ yield at very low transverse momenta in Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV and U+U collisions at $\sqrt{s_{NN}}$=193 GeV / J. Adam, L. ADAMCZYK, [et al.], Ł. FULEK, [et al.], M. PRZYBYCIEŃ, [et al.], R. SIKORA, [et al.] // Physical Review Letters ; ISSN 0031-9007. — 2019 — vol. 123 iss. 13 art. no. 132302, s. 132302-1–132302-8. — Bibliogr. s. 132302-7–132302-8. — Publikacja dostępna online od: 2019-09-27
Autorzy (342)
Dane bibliometryczne
| ID BaDAP | 125567 |
|---|---|
| Data dodania do BaDAP | 2019-12-11 |
| Tekst źródłowy | URL |
| DOI | 10.1103/PhysRevLett.123.132302 |
| Rok publikacji | 2019 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Physical Review Letters |
Abstract
We report on the first measurements of J/psi production at very low transverse momentum (p(T) < 0.2 GeV/c) in hadronic Au + Au collisions at root S-NN = 200 GeV and U + U collisions at ONN = 193 GeV. Remarkably, the inferred nuclear modification factor of J/psi at midrapidity in Au + Au (U + U) collisions reaches about 24 (52) for p(T) < 0.05 GeV/c in the 60%-80% collision centrality class. This noteworthy enhancement cannot be explained by hadronic production accompanied by cold and hot medium effects. In addition, the dN/dt distribution of J/psi for the very low p(T) range is presented for the first time. The distribution is consistent with that expected from the Au nucleus and shows a hint of interference. Comparison of the measurements to theoretical calculations of coherent production shows that the excess yield can be described reasonably well and reveals a partial disruption of coherent production in semicentral collisions, perhaps due to the violent hadronic interactions. Incorporating theoretical calculations, the results strongly suggest that the dramatic enhancement of J/psi yield observed at extremely low p(T) originates from coherent photon-nucleus interactions. In particular, coherently produced J/psi in violent hadronic collisions may provide a novel probe of the quark-gluon plasma.
