Observation of Excess J /ψ Yield at Very Low Transverse Momenta in Au+Au Collisions at sNN =200 GeV and U+ U Collisions at sNN =193 GeV

J. Adam , Daniel Kikoła , Adam Kisiel , Andrzej Lipiec , Jan Pluta , Sebastian Siejka , P. Szymanski , Hanna Zbroszczyk

Abstract

We report on the first measurements of J/ψ production at very low transverse momentum (pT<0.2 GeV/c) in hadronic Au+Au collisions at sNN=200 GeV and U+U collisions at sNN=193 GeV. Remarkably, the inferred nuclear modification factor of J/ψ at midrapidity in Au+Au (U+U) collisions reaches about 24 (52) for pT<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/ψ for the very low pT 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/ψ yield observed at extremely low pT originates from coherent photon-nucleus interactions. In particular, coherently produced J/ψ's in violent hadronic collisions may provide a novel probe of the quark-gluon plasma.

Collective authorL. Adamczyk, J.R. Adams, J.K. Adkins, G. Agakishiev, M.M. Aggarwal, Z. Ahammed, I. Aleksee.....
Author J. Adam - [Creighton University]
J. Adam,,
-
-
, Daniel Kikoła (FP / NPD)
Daniel Kikoła,,
- Nuclear Physics Division
, Adam Kisiel (FP / NPD)
Adam Kisiel,,
- Nuclear Physics Division
, Andrzej Lipiec (FP / NPD)
Andrzej Lipiec,,
- Nuclear Physics Division
, Jan Pluta (FP / NPD)
Jan Pluta,,
- Nuclear Physics Division
, Sebastian Siejka (FP / NPD)
Sebastian Siejka,,
- Nuclear Physics Division
, P. Szymanski (WUT)
P. Szymanski,,
- Warsaw University of Technology
, Hanna Zbroszczyk (FP / NPD)
Hanna Zbroszczyk,,
- Nuclear Physics Division
Journal seriesPhysical Review Letters, ISSN 0031-9007, e-ISSN 1079-7114, (N/A 200 pkt)
Issue year2019
Vol123
No13
Pages132302-1-132302-8
Publication size in sheets0.3
ASJC Classification3100 General Physics and Astronomy
DOIDOI:10.1103/PhysRevLett.123.132302
Languageen angielski
Score (nominal)200
Score sourcejournalList
ScoreMinisterial score = 200.0, 09-01-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 2.464; WoS Impact Factor: 2018 = 9.227 (2) - 2018=8.313 (5)
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