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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

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dc.contributor.authorAdam, J.
dc.contributor.authorAdamczyk, L.
dc.contributor.authorAdams, J. R.
dc.contributor.authorAdkins, J. K.
dc.contributor.authorAlekseev, I.
dc.contributor.authorBrandin, A. V.
dc.contributor.authorKochenda, L.
dc.contributor.authorKravtsov, P.
dc.contributor.authorNigmatkulov, G.
dc.contributor.authorOkorokov, V. A.
dc.contributor.authorStrikhanov, M.
dc.contributor.authorTaranenko, A.
dc.contributor.authorАлексеев, Игорь Геннадьевич
dc.contributor.authorБрандин, Андрей Владимирович
dc.contributor.authorНигматкулов, Григорий Александрович
dc.contributor.authorОкороков, Виталий Алексеевич
dc.contributor.authorСтриханов, Михаил Николаевич
dc.contributor.authorТараненко, Аркадий Владимирович
dc.date.accessioned2024-11-21T12:22:49Z
dc.date.available2024-11-21T12:22:49Z
dc.date.issued2019
dc.description.abstract© 2019 authors. Published by the American Physical Society.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.
dc.identifier.citationObservation 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 / Adam, J. [et al.] // Physical Review Letters. - 2019. - 123. - № 13. - 10.1103/PhysRevLett.123.132302
dc.identifier.doi10.1103/PhysRevLett.123.132302
dc.identifier.urihttps://www.doi.org/10.1103/PhysRevLett.123.132302
dc.identifier.urihttps://www.scopus.com/record/display.uri?eid=2-s2.0-85073061405&origin=resultslist
dc.identifier.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000488270200018
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/18744
dc.relation.ispartofPhysical Review Letters
dc.titleObservation 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
dc.typeArticle
dspace.entity.typePublication
oaire.citation.issue13
oaire.citation.volume123
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