Gluon EMC effect and fractional energy loss in Upsilon production in dAu collisions at RHIC - IN2P3 - Institut national de physique nucléaire et de physique des particules
Article Dans Une Revue European Physical Journal C: Particles and Fields Année : 2013

Gluon EMC effect and fractional energy loss in Upsilon production in dAu collisions at RHIC

Résumé

We demonstrate that the nuclear modification factor R^Upsilon_dAu measured at RHIC can only be reproduced once two supplemental Cold Nuclear Matter effects are taken into account. At backward rapidities, the visible suppression of R^Upsilon_dAu hints at the presence of a gluon EMC effect, analogous to the quark EMC effect -- but likely stronger. At forward and mid rapidities, the data can only be accounted for by a fractional energy loss, recently revived in the literature. Our conclusions do not depend on the detail of the nuclear parton distributions. We thus argue that this may be the first observation of a gluon EMC effect stronger than the quark one.

Dates et versions

in2p3-00649008 , version 1 (13-12-2011)

Identifiants

Citer

E. G. Ferreiro, F. Fleuret, J. P. Lansberg, N. Matagne, A. Rakotozafindrabe. Gluon EMC effect and fractional energy loss in Upsilon production in dAu collisions at RHIC. European Physical Journal C: Particles and Fields, 2013, 73, pp.2427. ⟨10.1140/epjc/s10052-013-2427-5⟩. ⟨in2p3-00649008⟩
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