Cold-nuclear-matter effects on heavy-quark production in d+Au collisions at √s.sub.NN./sub.=200 GeV

0390054 - FZÚ 2013 RIV US eng J - Článek v odborném periodiku
Adare, A. - Aidala, C. - Ajitanand, N.N. - Růžička, Pavel - Tomášek, Lukáš - Vrba, Václav … celkem 376 autorů
Cold-nuclear-matter effects on heavy-quark production in d+Au collisions at √s_NN=200 GeV.
Physical Review Letters. Roč. 109, č. 24 (2012), "242301-1"-"242301-11". ISSN 0031-9007. E-ISSN 1079-7114
Grant CEP: GA MŠMT LC527
Výzkumný záměr: CEZ:AV0Z10100502
Klíčová slova: PHENIX * RHIC * nucleus shadowing * rapidity dependence * fragmentation * J/psi * Upsilon * heavy ion
Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
Impakt faktor: 7.943, rok: 2012
http://arxiv.org/abs/arXiv:1211.4017

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.
Trvalý link: http://hdl.handle.net/11104/0218926