Measurement of an Excess in the Yield of J/psi at Very Low p(T) in Pb-Pb Collisions at root s(NN)=2.76 TeV

J. Adam; D. Adamova; MM. Aggarwal; G.A. Rinella; Maria Agnello; N. Agrawal; Z. Ahammed; C. Ahn; S. Aiola; A. Akindinov; Ian Bearden; Hans Bøggild; Christian Holm Christensen; Jens Jørgen Gaardhøje; Hans Hjersing Dalsgaard; Børge Svane Nielsen; Kristjan Herlache Gulbrandsen; Ante Bilandzic; Marek Chojnacki; Valentina Zaccolo; Christian Alexander Bourjau; Alexander Colliander Hansen

doi:10.1103/PhysRevLett.116.222301

Measurement of an Excess in the Yield of J/psi at Very Low p(T) in Pb-Pb Collisions at root s(NN)=2.76 TeV

J. Adam, D. Adamova, MM. Aggarwal, G.A. Rinella, Maria Agnello, N. Agrawal, Z. Ahammed, C. Ahn, S. Aiola, A. Akindinov, Ian Bearden, Hans Bøggild, Christian Holm Christensen, Jens Jørgen Gaardhøje, Hans Hjersing Dalsgaard, Børge Svane Nielsen, Kristjan Herlache Gulbrandsen, Ante Bilandzic, Marek Chojnacki, Valentina ZaccoloChristian Alexander Bourjau, Alexander Colliander Hansen

Experimental Particle Physics

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Abstract

We report on the first measurement of an excess in the yield of J/ψ at very low transverse momentum (pT<0.3 GeV/c) in peripheral hadronic Pb-Pb collisions at sNN=2.76 TeV, performed by ALICE at the CERN LHC. Remarkably, the measured nuclear modification factor of J/ψ in the rapidity range 2.5<y<4 reaches about 7 (2) in the pT range 0-0.3 GeV/c in the 70%-90% (50%-70%) centrality class. The J/ψ production cross section associated with the observed excess is obtained under the hypothesis that coherent photoproduction of J/ψ is the underlying physics mechanism. If confirmed, the observation of J/ψ coherent photoproduction in Pb-Pb collisions at impact parameters smaller than twice the nuclear radius opens new theoretical and experimental challenges and opportunities. In particular, coherent photoproduction accompanying hadronic collisions may provide insight into the dynamics of photoproduction and nuclear reactions, as well as become a novel probe of the quark-gluon plasma.

Original language	English
Article number	222301
Journal	Physical Review Letters
Volume	116
Issue number	22
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.116.222301
Publication status	Published - 2 Jun 2016

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Adam, J., Adamova, D., Aggarwal, MM., Rinella, G. A., Agnello, M., Agrawal, N., Ahammed, Z., Ahn, C., Aiola, S., Akindinov, A., Bearden, I., Bøggild, H., Christensen, C. H., Gaardhøje, J. J., Dalsgaard, H. H., Nielsen, B. S., Gulbrandsen, K. H., Bilandzic, A., Chojnacki, M., ... Hansen, A. C. (2016). Measurement of an Excess in the Yield of J/psi at Very Low p(T) in Pb-Pb Collisions at root s(NN)=2.76 TeV. Physical Review Letters, 116(22), Article 222301. https://doi.org/10.1103/PhysRevLett.116.222301

Adam, J, Adamova, D, Aggarwal, MM, Rinella, GA, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, C, Aiola, S, Akindinov, A, Bearden, I , Bøggild, H , Christensen, CH , Gaardhøje, JJ, Dalsgaard, HH, Nielsen, BS , Gulbrandsen, KH, Bilandzic, A, Chojnacki, M, Zaccolo, V, Bourjau, CA & Hansen, AC 2016, 'Measurement of an Excess in the Yield of J/psi at Very Low p(T) in Pb-Pb Collisions at root s(NN)=2.76 TeV', Physical Review Letters, vol. 116, no. 22, 222301. https://doi.org/10.1103/PhysRevLett.116.222301

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abstract = "We report on the first measurement of an excess in the yield of J/ψ at very low transverse momentum (pT<0.3 GeV/c) in peripheral hadronic Pb-Pb collisions at sNN=2.76 TeV, performed by ALICE at the CERN LHC. Remarkably, the measured nuclear modification factor of J/ψ in the rapidity range 2.5",

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AU - Rinella, G.A.

AU - Agnello, Maria

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahn, C.

AU - Aiola, S.

AU - Akindinov, A.

AU - Bearden, Ian

AU - Bøggild, Hans

AU - Christensen, Christian Holm

AU - Gaardhøje, Jens Jørgen

AU - Dalsgaard, Hans Hjersing

AU - Nielsen, Børge Svane

AU - Gulbrandsen, Kristjan Herlache

AU - Bilandzic, Ante

AU - Chojnacki, Marek

AU - Zaccolo, Valentina

AU - Bourjau, Christian Alexander

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Measurement of an Excess in the Yield of J/psi at Very Low p(T) in Pb-Pb Collisions at root s(NN)=2.76 TeV

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