J/psi production and nuclear effects in p-Pb collisions at sqrt(sNN)=5.02 TeV

B. Abelev , Laurent Aphecetche (1) , Y.W. Baek (2) , A. Baldisseri (3) , V. Barret (2) , N. Bastid (2) , I. Belikov (4) , A.A.E. Bergognon (1) , H. Borel (3) , M. Bregant (1) , J. Castillo Castellanos (3) , J.L. Charvet (3) , C. Cheshkov (5) , B. Cheynis (5) , P. Crochet (2) , H. Delagrange (1) , L. Ducroux (5) , P. Dupieux (2) , B. Erazmus (1) , Magali Estienne (1) , Marie Germain (1) , J.-Y. Grossiord (5) , Maxime Guilbaud (5) , A. Lardeux (1) , S. Li (2) , X. Lopez (2) , F. Manso (2) , M. Marchisone (2) , Gines Martinez Garcia (1) , J. Martin Blanco (1) , A. Mas (1) , L. Massacrier (1) , L. Molnar (4) , H. Pereira da Costa (3) , Philippe Pillot (1) , S. Porteboeuf-Houssais (2) , A. Rakotozafindrabe (3) , P. Rosnet (2) , C. Roy (4) , X. Sanchez Castro (4) , Y. Schutz (1) , Alexandre Shabetai (1) , Diego Stocco (1) , R. Tieulent (5) , A. Uras (5) , R. Vernet (6) , B. Vulpescu (2) , H. Yang (3) , X. Zhang (2) , Y. Zoccarato (5) , N. Arbor (7) , G. Conesa Balbastre (7) , J. Faivre (7) , C. Furget (7) , R. Guernane (7) , S. Kox (7) , J.S. Real (7) , C. Silvestre (7) , Z. Conesa Del Valle (8) , I. Das , B. Espagnon (8) , C. Hadjidakis (8) , I. Lakomov (8) , C. Suire (8) , J. D. Tapia Takaki (8) , L. Valencia Palomo (8)

1 SUBATECH - Laboratoire SUBATECH Nantes
2 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
3 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
4 IPHC - Institut Pluridisciplinaire Hubert Curien
5 IPNL - Institut de Physique Nucléaire de Lyon
6 CC-IN2P3 - Centre de Calcul de l'IN2P3
7 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
8 IPNO - Institut de Physique Nucléaire d'Orsay

Inclusive J/psi production has been studied with the ALICE detector in p-Pb collisions at sqrt(sNN) = 5.02 TeV at the CERN LHC, in the rapidity domains 2.03 < ycms < 3.53 and -4.46 < ycms < -2.96, down to zero transverse momentum. The J/psi measurement is performed in the Muon Spectrometer through the mu+ mu- decay mode. In this paper, the J/psi production cross section and the nuclear modification factor R(pPb) for the rapidities under study are presented. While at forward rapidity, corresponding to the proton direction, a suppression of the J/psi yield with respect to binary-scaled pp collisions is observed, in the backward region no suppression is present. The ratio of the forward and backward yields is also shown differentially in rapidity and transverse momentum. Theoretical predictions based on nuclear shadowing, as well as on models including, in addition, a contribution from partonic energy loss, are in fair agreement with the experimental results.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]; Physique Nucléaire Expérimentale [nucl-ex]

B. Abelev, Laurent Aphecetche, Y.W. Baek, A. Baldisseri, V. Barret, et al.. J/psi production and nuclear effects in p-Pb collisions at sqrt(sNN)=5.02 TeV. Journal of High Energy Physics, 2014, 2, pp.073. ⟨10.1007/JHEP02(2014)073⟩. ⟨in2p3-00856719⟩