Charmonium and e+e- pair photoproduction at mid-rapidity in ultra-peripheral Pb-Pb collisions at sqrt(sNN) = 2.76 TeV - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles European Physical Journal C: Particles and Fields Year : 2013

Charmonium and e+e- pair photoproduction at mid-rapidity in ultra-peripheral Pb-Pb collisions at sqrt(sNN) = 2.76 TeV

E. Abbas
  • Function : Author
C. Roy
Laurent Aphecetche
Guillaume Batigne
B. Erazmus
  • Function : Author
  • PersonId : 1178907
  • IdRef : 033726485
Magali Estienne
Marie Germain
Gines Martinez Garcia
Philippe Pillot
Alexandre Shabetai
Diego Stocco
B. Cheynis
Maxime Guilbaud

Abstract

The ALICE Collaboration at the LHC has measured the j/psi and psi' photoproduction at mid-rapidity in ultra-peripheral Pb-Pb collisions at sqrt(sNN) = 2.76 TeV. The charmonium is identified via its leptonic decay for events where the hadronic activity is required to be minimal. The analysis is based on an event sample corresponding to an integrated luminosity of about 23 {\mu}b^{-1}. The cross section for coherent and incoherent j/psi production in the rapidity interval -0.9 < y < 0.9, are d{\sigma}_{J/{\psi}}^{coh}/dy = 2.38^{+0.34}_{-0.24}(sta+sys) mb and d{\sigma}_{J/{\psi}}^{inc}/dy = 0.98^{+0.19}_{-0.17}(sta+sys) mb, respectively. The results are compared to theoretical models for j/{\psi} production and the coherent cross section is found to be in good agreement with those models which include nuclear gluon shadowing consistent with EPS09 parametrization. In addition the cross section for the process {\gamma}{\gamma} -> e+e- has been measured and found to be in agreement with the STARLIGHT Monte Carlo predictions.

Dates and versions

in2p3-00821782 , version 1 (13-05-2013)

Identifiers

Cite

E. Abbas, N. Arbor, G. Conesa Balbastre, J. Faivre, C. Furget, et al.. Charmonium and e+e- pair photoproduction at mid-rapidity in ultra-peripheral Pb-Pb collisions at sqrt(sNN) = 2.76 TeV. European Physical Journal C: Particles and Fields, 2013, 73, pp.2617. ⟨10.1140/epjc/s10052-013-2617-1⟩. ⟨in2p3-00821782⟩
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