Measurement of an Excess in the Yield of J/ψ at Very Low pT in Pb-Pb Collisions at √sNN = 2.76 TeV
ALICE Collaboration. (2016). Measurement of an Excess in the Yield of J/ψ at Very Low pT in Pb-Pb Collisions at √sNN = 2.76 TeV. Physical Review Letters, 116(22), Article 222301. https://doi.org/10.1103/PhysRevLett.116.222301
Published in
Physical Review LettersAuthors
Date
2016Copyright
© 2016 CERN, for the ALICE Collaboration, 2016. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License.
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.
...


Publisher
American Physical SocietyISSN Search the Publication Forum
0031-9007Keywords
Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/26095769
Metadata
Show full item recordCollections
License
Except where otherwise noted, this item's license is described as © 2016 CERN, for the ALICE Collaboration, 2016. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License.
Related items
Showing items with similar title or keywords.
-
Measurement of prompt Ds+-meson production and azimuthal anisotropy in Pb–Pb collisions at √sNN = 5.02 TeV
ALICE Collaboration (Elsevier BV, 2022)The production yield and angular anisotropy of prompt Ds+ mesons were measured as a function of transverse momentum (pT) in Pb–Pb collisions at a centre-of-mass energy per nucleon pair sNN=5.02TeV collected with the ALICE ... -
Transverse-momentum and event-shape dependence of D-meson flow harmonics in Pb–Pb collisions at √sNN = 5.02 TeV
ALICE Collaboration (Elsevier BV, 2021)The elliptic and triangular flow coefficients v2 and v3 of prompt D0, D+, and D⁎+ mesons were measured at midrapidity (|y|<0.8) in Pb–Pb collisions at the centre-of-mass energy per nucleon pair of √sNN=5.02TeV with the ... -
Single electron yields from semileptonic charm and bottom hadron decays in Au+Au collisions at √sNN = 200 GeV
PHENIX Collaboration (American Physical Society, 2016)The PHENIX Collaboration at the Relativistic Heavy Ion Collider has measured open heavy flavor production in minimum bias Au + Au collisions at √sNN = 200 GeV via the yields of electrons from semileptonic decays of charm ... -
Anisotropic flow of identified hadrons in Xe-Xe collisions at √sNN = 5.44 TeV
ALICE collaboration (Springer, 2021)Measurements of elliptic (v2) and triangular (v3) flow coefficients of π±, K±, p+p¯, K0S, and Λ+Λ¯ obtained with the scalar product method in Xe-Xe collisions at √sNN = 5.44 TeV are presented. The results are obtained in ... -
Production of Λ and KS0 in jets in p–Pb collisions at √sNN = 5.02 TeV and pp collisions at √s = 7 TeV
ALICE Collaboration (Elsevier BV, 2022)The production of Λ baryons and KS0 mesons (V0 particles) was measured in p–Pb collisions at √sNN=5.02 TeV and pp collisions at √s=7 TeV with ALICE at the LHC. The production of these strange particles is studied separately ...