Coherent J/Psi photoproduction in ultra-peripheral Pb-Pb collisions at \sqrt{s_NN} = 2.76 TeV

B. Abelev; N. Arbor; G. Conesa Balbastre; J. Faivre; C. Furget; R. Guernane; S. Kox; J.S. Real; C. Silvestre; R. Vernet; I. Belikov; B. Hippolyte; C. Kuhn; L. Molnar; C. Roy; X. Sanchez Castro; S. Senyukov; R. Wan; L. Aphecetche; G. Batigne; E. Bergognon; M. Bregant; H. Delagrange; O. Driga; B. Erazmus; M. Estienne; M. Germain; A. Lardeux; G. Martinez Garcia; A. Mas; L. Massacrier; A. Matyja; P. Pillot; Y. Schutz; A. Shabetai; D. Stocco; c. Cheshkov; B. Cheynis; L. Ducroux; J.-Y. Grossiord; M. Guilbaud; R. Tieulent; A. Uras; Y. Zoccarato; S.U. Ahn; Y.W. Baek; V. Barret; N. Bastid; P. Crochet; P. Dupieux; R. Ichou; X. Lopez; F. Manso; M. Marchisone; S. Porteboeuf-Houssais; P. Rosnet; B. Vulpescu; X. Zhang

HAL : in2p3-00733121, version 1

arXiv : 1209.3715

DOI : 10.1016/j.physletb.2012.11.059

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Physics Letters B 718 (2013) 1273-1283

Coherent J/Psi photoproduction in ultra-peripheral Pb-Pb collisions at \sqrt{s_NN} = 2.76 TeV

B. Abelev, N. Arbor¹, G. Conesa Balbastre¹, J. Faivre, C. Furget¹, R. Guernane¹, S. Kox¹, J.S. Real¹, C. Silvestre¹, R. Vernet², I. Belikov³, B. Hippolyte³, C. Kuhn³, L. Molnar³, C. Roy³, X. Sanchez Castro³, S. Senyukov³, R. Wan³, L. Aphecetche⁴, G. Batigne⁴, E. Bergognon⁴, M. Bregant⁴, H. Delagrange⁴, O. Driga⁴, B. Erazmus⁴, M. Estienne⁴, M. Germain⁴, A. Lardeux⁴, G. Martinez Garcia⁴, A. Mas⁴, L. Massacrier⁴, A. Matyja⁴, P. Pillot⁴, Y. Schutz⁴, A. Shabetai⁴, D. Stocco⁴, c. Cheshkov⁵, B. Cheynis⁵, L. Ducroux⁵, J.-Y. Grossiord⁵, M. Guilbaud⁵, R. Tieulent⁵, A. Uras⁵, Y. Zoccarato⁵, S.U. Ahn⁶, Y.W. Baek⁶, V. Barret⁶, N. Bastid⁶, P. Crochet⁶, P. Dupieux⁶, R. Ichou⁶, X. Lopez⁶, F. Manso⁶, M. Marchisone⁶, S. Porteboeuf-Houssais⁶, P. Rosnet⁶, B. Vulpescu⁶, X. Zhang⁶

ALICE Collaboration(s)

(2013)

The ALICE collaboration has made the first measurement at the LHC of J/Psi photoproduction in ultra-peripheral Pb-Pb-collisions at \sqrt{s_NN} = 2.76 TeV. The J/Psi is identified via its dimuon decay in the forward rapidity region with the muon spectrometer 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 55 mub-1. The cross section for coherent J/Psi production in the rapidity interval -3.6 < y < -2.6 is measured to be dsigma/dy = 1.00 +/- 0.18 (stat) +0.24/-0.26 (syst) mb. The result is compared to theoretical models for coherent J/Psi production and found to be in good agreement with models which include nuclear gluon shadowing.

1 :	LPSC - Laboratoire de Physique Subatomique et de Cosmologie

2 :	CC IN2P3 - Centre de Calcul de l'inst. national de phy. nucléaire et de phy. des particules

3 :	DRS-IPHC - Département Recherches Subatomiques

4 :	SUBATECH - Laboratoire SUBATECH Nantes

5 :	IPNL - Institut de Physique Nucléaire de Lyon

6 :	LPC-CLERMONT - Laboratoire de Physique Corpusculaire de Clermont-Ferrand

Thème(s)

Physique/Physique des Hautes Energies - Expérience

Physique/Physique des Hautes Energies - Phénoménologie

Physique/Physique Nucléaire Expérimentale

Lien vers le texte intégral :

http://fr.arXiv.org/abs/1209.3715


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Soumis le : Mardi 18 Septembre 2012, 08:14:20
Dernière modification le : Jeudi 7 Mars 2013, 07:51:40