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.
-
Dielectron production at midrapidity at low transverse momentum in peripheral and semi-peripheral Pb–Pb collisions at √sNN = 5.02 TeV
ALICE Collaboration (Springer, 2023) -
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 ... -
First measurement of Λ+c production down to pT = 0 in pp and p-Pb collisions at √sNN = 5.02 TeV
ALICE Collaboration (American Physical Society (APS), 2023)The production of prompt Λ+c baryons has been measured at midrapidity in the transverse momentum interval 0<1 GeV/c for the first time, in pp and p–Pb collisions at a center-of-mass energy per nucleon-nucleon collision ... -
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 ... -
Characterizing the initial conditions of heavy-ion collisions at the LHC with mean transverse momentum and anisotropic flow correlations
ALICE Collaboration (Elsevier BV, 2022)Correlations between mean transverse momentum [pT] and anisotropic flow coefficients v2 or v3 are measured as a function of centrality in Pb-Pb and Xe-Xe collisions at √sNN=5.02 TeV and 5.44 TeV, respectively, with ALICE. ...