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

Author(s)
Balewski, Jan T.; Betancourt, Michael Joseph; Corliss, Ross Cameron; Hays-Wehle, James Prewitt; Jones, Christopher LaDon; Kocoloski, Adam Philip; Leight, William Axel; Sakuma, Tai; Seele, Joseph Patrick; Surrow, Bernd; Hoffman, Alan Michael; Milner, Richard G; Redwine, Robert P; van Nieuwenhuizen, Gerrit J; Walker, Matthew H; ... Show more Show less
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Abstract
We report on a measurement of the Υ(1S+2S+3S)→e+e- cross section at midrapidity in p+p collisions at √s=200  GeV. We find the cross section to be 114±38(stat+fit)-24+23(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 2σ [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 Υ data to RHIC energies. The dielectron continuum in the invariant-mass range near the Υ is also studied to obtain a combined yield of e+e- pairs from the sum of the Drell-Yan process and b-b̅ production.
Date issued
2010-07
URI
http://hdl.handle.net/1721.1/60459
Department
Bates Linear Accelerator Center; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical review D
Publisher
American Physical Society
Citation
Abelev, B. et al. “Υ cross section in p+p collisions at sqrt[s]=200  GeV.” Physical Review D 82.1 (2010): n. pag. © 2010 The American Physical Society
Version: Final published version
ISSN
1550-7998
1550-2368

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