Measurement of an Excess in the Yield of J/ψ at Very Low pT in Pb-Pb Collisions at s NN=2.76 TeV

(ALICE Collaboration)

Research output: Contribution to journalArticle

42 Citations (Scopus)

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 languageEnglish
Article number222301
JournalPhysical Review Letters
Volume116
Issue number22
DOIs
Publication statusPublished - Jun 2 2016

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photoproduction
collisions
transverse momentum
nuclear reactions
quarks
physics
radii
probes
cross sections

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Measurement of an Excess in the Yield of J/ψ at Very Low pT in Pb-Pb Collisions at s NN=2.76 TeV. / (ALICE Collaboration).

In: Physical Review Letters, Vol. 116, No. 22, 222301, 02.06.2016.

Research output: Contribution to journalArticle

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