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 inPhysical Review Letters
© 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. ...
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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.
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