标题:upsilon cross section in p plus p collisions at root s=200 GeV
作者:Abelev, B. I.; Aggarwal, M. M.; Ahammed, Z.; Alakhverdyants, A. V.; Anderson, B. D.; Arkhipkin, D.; Averichev, G. S.; Balewski, J.; Ba 更多
作者机构:[Abelev, B. I.; Betts, R. R.; Evdokimov, O.; Garcia-Solis, E. J.; Hofman, D. J.; Hollis, R. S.; Iordanova, A.; Kauder, K.; Suarez, M. C.] Univ Illinoi 更多
通讯作者:Abelev, BI
通讯作者地址:[Abelev, BI]Univ Illinois, Chicago, IL 60607 USA.
来源:PHYSICAL REVIEW D
出版年:2010
卷:82
期:1
DOI:10.1103/PhysRevD.82.012004
摘要:We report on a measurement of the gamma(1S + 2S + 3S) -> e(+)e(-) cross section at midrapidity in p + p collisions at root 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 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 gamma data to RHIC energies. The dielectron continuum in the invariant-mass range near the gamma is also studied to obtain a combined yield of e(+)e(-) pairs from the sum of the Drell-Yan process and b-(b) over bar production.
收录类别:SCIE
WOS核心被引频次:25
资源类型:期刊论文
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