Υ cross section in p+p collisions at s√=200  GeV

Abelev, B. I. and Planinić, Mirko and Poljak, Nikola and Zoulkarneeva, Y. (STAR Collaboration) (2010) Υ cross section in p+p collisions at s√=200  GeV. Physical Review D, 82 (1). pp. 12004-17. ISSN 1550-7998

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Abstract

We report on a measurement of the Upsilon(1S+2S+3S) -> e+e- cross section at midrapidity in p+p collisions at sqrt(s)=200 GeV. We find the cross section to be 114 +/- 38 (stat.) +23, -24 (syst.) pb. Perturbative QCD calculations at next-to-leading order in the Color Evaporation Model are in agreement with our measurement, while calculations in the Color Singlet Model underestimate it by 2 sigma. Our result is consistent with the trend seen in world data as a function of the center-of-mass energy of the collision and extends the availability of Upsilon data to RHIC energies. The dielectron continuum in the invariant mass range near the Upsilon is also studied to obtain a combined cross section of Drell-Yan plus (b b-bar) -> e+e-.

Item Type: Article
Keywords: p p, interaction upsilon mesons, hadroproduction upsilon mesons, leptonic decay electron positron, mass spectrum channel cross section, branching ratio energy dependence quantum chromodynamics, perturbation theory color, singlet Drell-Yan process quark antiquark, annihilation bottom STAR Brookhaven RHIC Coll upsilon mesons --> positron electron 200 GeV-cms/nucleon
Date: July 2010
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2010) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 09 Jun 2014 13:04
Last Modified: 24 Feb 2016 15:30
URI: http://digre.pmf.unizg.hr/id/eprint/2305

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