Upsilon production in p(d)A collisions at RHIC and the LHC

[en] 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.

Research center :

AGIF - Algèbre, Géométrie et Interactions fondamentales

Disciplines :

Physics

Author, co-author :

Ferreiro, E.G.

Fleuret, F.

Lansberg, J.-P.

Matagne, Nicolas ; Université de Mons > Faculté des Sciences > Physique nucléaire et subnucléaire

Rakotozafindrabe, A.

Language :

English

Title :

Upsilon production in p(d)A collisions at RHIC and the LHC

Publication date :

15 May 2013

Journal title :

European Physical Journal C. Particles and Fields

ISSN :

1434-6044

Publisher :

Springer, Germany

Volume :

Peer reviewed :

Peer Reviewed verified by ORBi

Research unit :

S824 - Physique nucléaire et subnucléaire

Research institute :

R150 - Institut de Recherche sur les Systèmes Complexes

Available on ORBi UMONS :

since 09 September 2013

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