期刊论文

Abelev, B. I.

英文

PHYSICAL REVIEW D

2470-0010

2010

82

1

10.1103/PhysRevD.82.012004

RHIC; RCF at BNL; NERSC Center at LBNL; Open Science Grid consortium; U.S. DOE Office of ScienceUnited States Department of Energy (DOE); U.S. NSFNational Science Foundation (NSF); Sloan FoundationAlfred P. Sloan Foundation; DFG cluster of excellence "Origin and Structure of the Universe'' of Germany; CNRS/IN2P3Centre National de la Recherche Scientifique (CNRS); STFCUK Research & Innovation (UKRI)Science & Technology Facilities Council (STFC); EPSRC, United KingdomUK Research & Innovation (UKRI)Engineering & Physical Sciences Research Council (EPSRC); FAPESP CNPq of Brazil; Ministry of Education and Science of the Russian FederationMinistry of Education and Science, Russian Federation; NNSFCNational Natural Science Foundation of China (NSFC); CASChinese Academy of Sciences; MoST; MoE of ChinaMinistry of Education, China; GA; MSMT of the Czech RepublicMinistry of Education, Youth & Sports - Czech Republic; FOMFOM (The Netherlands); NWO of the NetherlandsNetherlands Organization for Scientific Research (NWO); DAEDepartment of Atomic Energy (DAE); DSTDepartment of Science & Technology (India); CSIR of IndiaCouncil of Scientific & Industrial Research (CSIR) - India; Polish Ministry of Science and Higher EducationMinistry of Science and Higher Education, Poland; Korea Research FoundationKorea Research Foundation; Ministry of Science, Education and Sports of the Republic Of CroatiaMinistry of Science, Education and Sports, Republic of Croatia; Russian Ministry of Science and Technology; RosAtom of Russia; Science and Technology Facilities CouncilUK Research & Innovation (UKRI)Science & Technology Facilities Council (STFC) [PP/F001061/1] Funding Source: researchfish; Direct For Mathematical & Physical ScienNational Science Foundation (NSF)NSF - Directorate for Mathematical & Physical Sciences (MPS) [0758170] Funding Source: National Science Foundation

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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 diele...