HAL : in2p3-00724598, version 1

arXiv : 1207.3193

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Cold Nuclear Matter effects in Upsilon production in dAu collisions at RHIC

A. Rakotozafindrabe1, 2, E. G. Ferreiro, F. Fleuret1, J. P. Lansberg3, N. Matagne

(2012)

We report on our recent study of Cold Nuclear Matter effects on the Upsilon production at RHIC in dAu collisions. The first experimental results available on the nuclear modification factor R_dAu have rather large uncertainties. They nevertheless allow to bring qualitative information on the nature of the nuclear effects at play on top of the usual nuclear absorption, since the latter is expected to lie in a quite small range around a value close to ten times smaller as for charmonia. At backward rapidities, the behavior of R_dAu hints at the presence of a gluon EMC effect, analogous to the quark EMC effect -- but possibly stronger. Mid rapidity measurements with a better precision are highly desirable to pin down the gluon anti-shadowing, still under debate. At forward rapidities, the data leave some room for an additional fractional energy loss mechanism, recently revived in the literature.

1 :	LLR - Laboratoire Leprince-Ringuet
2 :	IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
3 :	IPNO - Institut de Physique Nucléaire d'Orsay

Thème(s)

:

Physique/Physique des Hautes Energies - Expérience Physique/Physique des Hautes Energies - Phénoménologie Physique/Physique Nucléaire Expérimentale Physique/Physique Nucléaire Théorique

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Contributeur : Sophie Heurteau <>

Soumis le : Mardi 21 Août 2012, 17:18:27

Dernière modification le : Jeudi 23 Août 2012, 14:08:01