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

73 Citations (Scopus)

45 Downloads (Pure)

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

Access to Document

10.1103/PhysRevLett.116.222301Licence: CC BY

PhysRevLett.116.222301Final published version, 285 KB

Cite this

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), [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

@article{802820cbe58a41bdbfb24af064dc4104,

title = "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 = "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",

author = "J. Adam and D. Adamova and MM. Aggarwal and G.A. Rinella and Maria Agnello and N. Agrawal and Z. Ahammed and C. Ahn and S. Aiola and A. Akindinov and Ian Bearden and Hans B{\o}ggild and Christensen, {Christian Holm} and Gaardh{\o}je, {Jens J{\o}rgen} and Dalsgaard, {Hans Hjersing} and Nielsen, {B{\o}rge Svane} and Gulbrandsen, {Kristjan Herlache} and Ante Bilandzic and Marek Chojnacki and Valentina Zaccolo and Bourjau, {Christian Alexander} and Hansen, {Alexander Colliander}",

year = "2016",

month = jun,

day = "2",

doi = "10.1103/PhysRevLett.116.222301",

language = "English",

volume = "116",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "22",

}

TY - JOUR

T1 - 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

AU - Adam, J.

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

PY - 2016/6/2

Y1 - 2016/6/2

N2 - 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

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

U2 - 10.1103/PhysRevLett.116.222301

DO - 10.1103/PhysRevLett.116.222301

M3 - Journal article

C2 - 27314714

SN - 0031-9007

VL - 116

JO - Physical Review Letters

JF - Physical Review Letters

IS - 22

M1 - 222301

ER -

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

Access to Document

Fingerprint

Cite this