文章基本信息

标题：Cold Nuclear Matter effects in Upsilon production in dAu collisions at RHIC
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作者：A. Rakotozafindrabe ; E.G. Ferreiro ; F. FLEURET 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2012
卷号：2012
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We report on our recent study of Cold Nuclear Matter effects on the ¡ production at RHIC in dAu collisions. The first experimental results available on the nuclear modification factor R¡ d Au 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¡ d Au 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.