Upsilon (1S+2S+3S) production in d+Au and p+p collisions at sqrt(s_NN)=200 GeV and cold-nuclear matter effects

Abstract : 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.
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Journal articles
Physical Review Letters, American Physical Society, 2012, 109, pp.242301. <10.1103/PhysRevLett.109.242301>


http://hal.in2p3.fr/in2p3-00756698
Contributor : Dominique Girod <>
Submitted on : Friday, November 23, 2012 - 3:00:25 PM
Last modification on : Friday, September 13, 2013 - 12:00:03 PM

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A. Adare, E. T. Atomssa, Z. Conesa Del Valle, D. D'Enterria, O. Drapier, et al.. Upsilon (1S+2S+3S) production in d+Au and p+p collisions at sqrt(s_NN)=200 GeV and cold-nuclear matter effects. Physical Review Letters, American Physical Society, 2012, 109, pp.242301. <10.1103/PhysRevLett.109.242301>. <in2p3-00756698>

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