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

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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.

Originalsprog	Engelsk
Artikelnummer	222301
Tidsskrift	Physical Review Letters
Vol/bind	116
Udgave nummer	22
ISSN	0031-9007
DOI	https://doi.org/10.1103/PhysRevLett.116.222301
Status	Udgivet - 2 jun. 2016

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10.1103/PhysRevLett.116.222301Licens: CC BY

PhysRevLett.116.222301Forlagets udgivne version, 285 KB

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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), Artikel 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, bind 116, nr. 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 - Adamova, D.

AU - Aggarwal, MM.

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

AU - Hansen, Alexander Colliander

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AB - 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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DO - 10.1103/PhysRevLett.116.222301

M3 - Journal article

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SN - 0031-9007

VL - 116

JO - Physical Review Letters

JF - Physical Review Letters

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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

Abstract

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