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2013-05-15 - Article/Dans un journal avec peer-review - Anglais - 8 page(s)

Ferreiro E.G., Fleuret F., Lansberg J.-P., Matagne Nicolas , Rakotozafindrabe A., "Upsilon production in p(d)A collisions at RHIC and the LHC" in European Physical Journal C -- Particles & Fields, 73, 2427

  • Edition : Springer Science & Business Media B.V., New York (NY)
  • Codes CREF : Physique des particules élémentaires (DI1221)
  • Unités de recherche UMONS : Physique nucléaire et subnucléaire (S824)
  • Instituts UMONS : Institut de Recherche sur les Systèmes Complexes (Complexys)
  • Centres UMONS : Algèbre, Géométrie et Interactions fondamentales (AGIF)
Texte intégral :

Abstract(s) :

(Anglais) We study the effect of nuclear matter in Upsilon production in dAu collisions at RHIC and pPb collisions at the LHC. We find that the nuclear modification factor, R^Upsilon_dAu, measured at RHIC is not satisfactorily reproduced by the conventional effects used in the literature, namely the modification of the gluon distribution in bound nucleons and an-effective-survival probability for a bound state to escape the nucleus. In particular, we argue that this probability should be close to 1 as opposed to the J/Psi case. We note that, at backward rapidities, the unexpected suppression of R^Upsilon_dAu observed by PHENIX hints at the presence of a gluon EMC effect, analogous to the quark EMC effect-but likely stronger. Further nuclear matter effects, such as saturation and fractional energy loss, are discussed, but none of them fit in a more global picture of quarkonium production. Predictions for Upsilon(nS) for the forthcoming pPb run at 5 TeV at the LHC are also presented.

Identifiants :
  • arXiv : 1110.5047
  • DOI : 10.1140/epjc/s10052-013-2427-5