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

STAR Collaboration,; Adam, J.; Schmitz, N.; Seyboth, P.; et al.,

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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

STAR Collaboration, Adam, J., Schmitz, N., Seyboth, P., & et al. (2019). 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. Physical Review Letters, 123, 132302. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2019-283.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-D791-4 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-D792-3

Genre: Journal Article

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STAR Collaboration¹, Author
Adam, J.¹, Author
Schmitz, N.¹, Author
Seyboth, P.¹, Author
et al.¹, Author

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1Max Planck Institute for Physics, Max Planck Society and Cooperation Partners, ou_2253650

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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 \sqrt{s_{\rm{NN}}} = 200 GeV and U+U collisions at \sqrt{s_{\rm{NN}}} = 193 GeV. Remarkably, the inferred nuclear modification factor of J/\psi at mid-rapidity in Au+Au (U+U) collisions reaches about 24 (52) for p_{T} < 0.05 GeV/c in the 60-80$\% collision centrality class. This noteworthy enhancement cannot be explained by hadronic production accompanied by cold and hot medium effects. In addition, the dN/dt distribution of J/\psi for the very low p_{T} range is presented for the first time. The distribution is consistent with that expected from the Au nucleus and shows a hint of interference. Comparison of the measurements to theoretical calculations of coherent production shows that the excess yield can be described reasonably well and reveals a partial disruption of coherent production in semi-central collisions, perhaps due to the violent hadronic interactions. Incorporating theoretical calculations, the results strongly suggest that the dramatic enhancement of J/$\psi$ yield observed at extremely low p_{T} originates from coherent photon-nucleus interactions. In particular, coherently produced J/\psi's in violent hadronic collisions may provide a novel probe of the quark-gluon-plasma.

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Dates: Date issued: 2019

Publication Status: Issued

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Identifiers: Other: MPP-2019-283
URI: https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2019-283
arXiv: arxiv:1904.11658
URI: https://inspirehep.net/search?p=find+eprint+1904.11658

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Title: Physical Review Letters

Abbreviation : Phys.Rev.Lett.

Source Genre: Journal

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Pages: - Volume / Issue: 123 Sequence Number: - Start / End Page: 132302 Identifier: -