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Title: Observation of Excess J/ψ 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

Abstract

Here, we report on the first measurements of J/ψ production at very low transverse momentum ( p T < 0.2 GeV/c) in hadronic Au+Au collisions at √ s NN = 200 GeV and U+U collisions at √ s NN = 193 GeV. Remarkably, the inferred nuclear modification factor of J/ψ at mid-rapidity 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/ψ 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 semi-central 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 p T originates from coherent photon-nucleus interactions. In particular, coherently produced J/ψ's in violent hadronic collisions may provide amore » novel probe of the quark-gluon-plasma.« less

Authors:
 [1]
  1. Creighton Univ., Omaha, NE (United States). et al.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Texas A & M Univ., College Station, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); Ministry of Education and Science of the Russian Federation; National Natural Science Foundation of China (NNSFC); Chinese Academy of Sciences (CAS); Ministry of Science and Technology of the People’s Republic of China; Ministry of Education of China; National Research Foundation of Korea (NRF); Czech Science Foundation (GACR); Ministry of Education, Youth and Sports of the Czech Republic; Hungarian National Research, Development and Innovation Office (NRDI); Hungarian Ministry of Human Capacities; Government of India; National Science Centre of Poland (NCN); Ministry of Science, Education and Sports of the Republic of Croatia; ROSATOM of Russia; German Federal Ministry of Education and Research (BMBF)
Contributing Org.:
STAR Collaboration
OSTI Identifier:
1566931
Alternate Identifier(s):
OSTI ID: 1523247; OSTI ID: 1594832
Report Number(s):
BNL-211606-2019-JAAM
Grant/Contract Number:  
SC0012704; SC0017982
Resource Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Name: Physical Review Letters
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Jets and heavy flavor physics; Quark-gluon plasma

Citation Formats

Adam, Jaroslav. Observation of Excess J/ψ 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. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.123.132302.
Adam, Jaroslav. Observation of Excess J/ψ 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. United States. doi:10.1103/PhysRevLett.123.132302.
Adam, Jaroslav. Fri . "Observation of Excess J/ψ 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". United States. doi:10.1103/PhysRevLett.123.132302.
@article{osti_1566931,
title = {Observation of Excess J/ψ 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},
author = {Adam, Jaroslav},
abstractNote = {Here, 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 mid-rapidity 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 semi-central 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.},
doi = {10.1103/PhysRevLett.123.132302},
journal = {Physical Review Letters},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {9}
}

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DOI: 10.1103/PhysRevLett.123.132302

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