Υ(1S+2S+3S) production in d+Au and p+p collisions at sNN=200 GeV and cold-nuclear-matter effects
Abstract
The three Υ states, Υ(1S+2S+3S), are measured in d+Au and p+p collisions at sNN=200 GeV and rapidities 1.2<|y|<2.2 by the PHENIX experiment at the Relativistic Heavy Ion Collider. Cross sections for the inclusive Υ(1S+2S+3S) production are obtained. The inclusive yields per binary collision for d+Au collisions relative to those in p+p collisions (RdAu) 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 [Eskola , J. High Energy Phys.10.1088/1126-6708/2009/04/065 04 (2009) 065], combined with a final-state breakup cross section, σbr, and compared to lower energy p+A results. We also compare the results to the PHENIX J/ψ results [Adare , Phys. Rev. Lett.PRLTAO0031-900710.1103/PhysRevLett.107.142301 107, 142301 (2011)]. The rapidity dependence of the observed Υ suppression is consistent with lower energy p+A measurements.
- Publication:
-
Physical Review C
- Pub Date:
- April 2013
- DOI:
- 10.1103/PhysRevC.87.044909
- arXiv:
- arXiv:1211.4017
- Bibcode:
- 2013PhRvC..87d4909A
- Keywords:
-
- 25.75.Dw;
- Particle and resonance production;
- Nuclear Experiment
- E-Print:
- 495 authors, 11 pages, 9 figures, 5 tables. Submitted to Phys. Rev. C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html