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Physical Review Letters 109 (2012) 242301
Upsilon (1S+2S+3S) production in d+Au and p+p collisions at sqrt(s_NN)=200 GeV and cold-nuclear matter effects
A. Adare, E.T. Atomssa1, Z. Conesa Del Valle1, D. d'Enterria1, O. Drapier1, F. Fleuret1, M. Gonin1, R. Granier de Cassagnac1, A. Rakotozafindrabe1, V.N. Tram1, L. Aphecetche2, A. Hadj Henni2, G. Roche3, P. Rosnet3, D. Jouan4
For the PHENIX collaboration(s)

The three Upsilon states, Upsilon(1S+2S+3S), are measured in d+Au and p+p collisions at sqrt(s_NN)=200 GeV and rapidities 1.2<|y|<2.2 by the PHENIX experiment at the Relativistic Heavy-Ion Collider. Cross sections for the inclusive Upsilon(1S+2S+3S) production are obtained. The inclusive yields per binary collision for d+Au collisions relative to those in p+p collisions (R_dAu) are found to be 0.62 +/- 0.26 (stat) +/- 0.13 (syst) in the gold-going direction and 0.91 +/- 0.33 (stat) +/- 0.16 (syst) in the deuteron-going direction. The measured results are compared to a nuclear-shadowing model, EPS09 [JHEP 04, 065 (2009)], combined with a final-state breakup cross section, sigma_br, and compared to lower energy p+A results. We also compare the results to the PHENIX J/psi results [Phys. Rev. Lett. 107, 142301 (2011)]. The rapidity dependence of the observed Upsilon suppression is consistent with lower energy p+A measurements.
1:  LLR - Laboratoire Leprince-Ringuet
2:  SUBATECH - Laboratoire SUBATECH Nantes
3:  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
4:  IPNO - Institut de Physique Nucléaire d'Orsay
Physics/Nuclear Experiment
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