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Observation of Excess J/psi Yield at Very Low Transverse Momenta in Au plus Au Collisions at root S-NN =200 GeV and U+U Collisions at root S-NN =193 GeV
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SYSNO ASEP 0509904 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Observation of Excess J/psi Yield at Very Low Transverse Momenta in Au plus Au Collisions at root S-NN =200 GeV and U+U Collisions at root S-NN =193 GeV Author(s) Adam, J. (US)
Adamczyk, L. (PL)
Adams, J. R. (US)
Adkins, J. K. (US)
Agakishiev, G. (RU)
Bielčík, J. (CZ)
Bielčíková, Jana (UJF-V) RID, ORCID, SAI
Federič, Pavol (UJF-V) ORCID, SAI
Chaloupka, P. (CZ)
Holub, L. (CZ)
Kocan, M. (CZ)
Kosarzewski, L. K. (CZ)
Kramárik, L. (CZ)
Líčeník, R. (CZ)
Matonoha, O. (CZ)
Moravcová, Z. (CZ)
Rusňák, Jan (UJF-V) RID, ORCID, SAI
Rusňáková, O. (CZ)
Šimko, Miroslav (UJF-V) ORCID, SAI
Šumbera, Michal (UJF-V) RID, ORCID, SAI
Vaněk, Jan (UJF-V) ORCID, SAINumber of authors 335 Article number 132302 Source Title Physical Review Letters. - : American Physical Society - ISSN 0031-9007
Roč. 123, č. 13 (2019)Number of pages 8 s. Publication form Print - P Language eng - English Country US - United States Keywords STAR collaboration ; heavy ion collisions Subject RIV BF - Elementary Particles and High Energy Physics OECD category Particles and field physics R&D Projects LTT18002 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UJF-V - RVO:61389005 UT WOS 000488270200018 EID SCOPUS 85073061405 DOI 10.1103/PhysRevLett.123.132302 Annotation 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. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2020 Electronic address https://doi.org/10.1103/PhysRevLett.123.132302
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