Direct virtual photon production in Au+Au collisions at s N N = 200 GeV
L. AdamczykAGH University of Science and Technology, FPACS, Cracow 30-059, PolandJ. K. AdkinsUniversity of Kentucky, Lexington, Kentucky 40506-0055G. AgakishievJoint Institute for Nuclear Research, Dubna, 141 980, RussiaM. M. AggarwalPanjab University, Chandigarh 160014, IndiaZ. AhammedVariable Energy Cyclotron Centre, Kolkata 700064, IndiaN. N. AjitanandState University of New York, Stony Brook, New York 11794I. AlekseevNational Research Nuclear University MEPhI, Moscow 115409, RussiaD. M. AndersonTexas A&M University, College Station, Texas 77843Y. G.University of Tsukuba, Tsukuba, Ibaraki, 305-8571 JapanA. AparinJoint Institute for Nuclear Research, Dubna, 141 980, RussiaD. ArkhipkinBrookhaven National Laboratory, Upton, New York 11973E. C. AschenauerBrookhaven National Laboratory, Upton, New York 11973M. U. AshrafTsinghua University, Beijing 100084A. AttriPanjab University, Chandigarh 160014, IndiaG. S. AverichevJoint Institute for Nuclear Research, Dubna, 141 980, RussiaX. BaiCentral China Normal University, Wuhan, Hubei 430079V. BairathiNational Institute of Science Education and Research, Bhubaneswar 751005, IndiaA. BeheraStony Brook UniversityR. BellwiedUniversity of Houston, Houston, Texas 77204A. BhasinUniversity of Jammu, Jammu 180001, IndiaA. K. BhatiJoint Institute for Nuclear Research, Dubna, 141 980, RussiaP. BhattaraiBrookhaven National Laboratory, Upton, New York 11973J. BielčíkStony Brook UniversityJ. BielčíkováState University of New York, Stony Brook, New York 11794L. C. BlandBrookhaven National Laboratory , Upton , New York 11973I. G. BordyuzhinAlikhanov Institute for Theoretical and Experimental Physics , Moscow 117218 , RussiaJ. BouchetKent State University , Kent , Ohio 44242J. D. BrandenburgRice University , Houston , Texas 77251A. V. BrandinNational Research Nuclear University MEPhI , Moscow 115409 , RussiaD. S. BrownCreighton University , Omaha , Nebraska 68178I. BunzarovUniversity of Jammu, Jammu 180001, IndiaJ. M. ButterworthStony Brook UniversityH. CainesUniversity of Jammu, Jammu 180001, IndiaM. Calderón de la Barca SánchezTsinghua University, Beijing 100084J. M. CampbellOhio State University, Columbus, Ohio 43210D. CebraUniversity of California , Davis , California 95616I. ChakaberiaUniversity of Jammu, Jammu 180001, IndiaP. ChaloupkaCzech Technical University in Prague , FNSPE , Prague , 115 19 , Czech RepublicZ. ChangVariable Energy Cyclotron Centre, Kolkata 700064, IndiaN. Chankova-BunzarovaJoint Institute for Nuclear Research , Dubna , 141 980 , RussiaA. ChatterjeeVariable Energy Cyclotron Centre, Kolkata 700064, IndiaS. ChattopadhyayVariable Energy Cyclotron Centre , Kolkata 700064 , IndiaX. ChenUniversity of Science and Technology of China , Hefei , Anhui 230026X. ChenUniversity of Science and Technology of China , Hefei , Anhui 230026Jiahao ChenCreighton University , Omaha , Nebraska 68178J. ChengState University of New York, Stony Brook, New York 11794M. CherneyTsinghua University, Beijing 100084W. ChristieBrookhaven National Laboratory , Upton , New York 11973G. ContinLawrence Berkeley National Laboratory , Berkeley , California 94720H. J. CrawfordUniversity of California , Berkeley , California 94720S. DasCentral China Normal University , Wuhan , Hubei 430079L.C. De SilvaCreighton University , Omaha , Nebraska 68178R. R. DebbeBrookhaven National Laboratory , Upton , New York 11973T. G. DedovichJoint Institute for Nuclear Research , Dubna , 141 980 , RussiaJ. DengStony Brook UniversityA. A. DerevschikovUniversity of California, Los Angeles, California 90095L. DidenkoUniversity of Houston, Houston, Texas 77204C. DilksCreighton University , Omaha , Nebraska 68178X. DongCentral China Normal University, Wuhan, Hubei 430079J. L. DrachenbergLamar University , Physics Department , Beaumont , Texas 77710J. E. DraperUniversity of California , Davis , California 95616L. E. DunkelbergerUniversity of California , Los Angeles , California 90095J. C. DunlopBrookhaven National Laboratory , Upton , New York 11973L. G. EfimovJoint Institute for Nuclear Research , Dubna , 141 980 , RussiaN. ElseyUniversity of Jammu, Jammu 180001, IndiaJ. EngelageUniversity of California, BerkeleyG. EppleyJoint Institute for Nuclear Research, Dubna, 141 980, RussiaR. EshaUniversity of Houston, Houston, Texas 77204S. EsumiUniversity of Jammu, Jammu 180001, IndiaO. EvdokimovUniversity of Illinois at Chicago , Chicago , Illinois 60607 iJ. EwiglebenStony Brook UniversityO. EyserBrookhaven National Laboratory , Upton , New York 11973R. FatemiUniversity of Kentucky , Lexington , Kentucky 40506-0055S. FazioUniversity of Jammu, Jammu 180001, IndiaP. FedericNuclear Physics Institute AS CR , 250 68 Prague , Czech RepublicP. FederičováBrookhaven National Laboratory, Upton, New York 11973J. FedorišinJoint Institute for Nuclear Research , Dubna , 141 980 , RussiaZ. FengVariable Energy Cyclotron Centre, Kolkata 700064, IndiaP. FilipBrookhaven National Laboratory, Upton, New York 11973E. FinchUniversity of Houston, Houston, Texas 77204Y. FisyakUniversity of Tsukuba, Tsukuba, Ibaraki, 305-8571 JapanC. E. FloresUniversity of California , Davis , California 95616J. FujitaState University of New York, Stony Brook, New York 11794Ł. FulekUniversity of Houston, Houston, Texas 77204C. A. GagliardiBrookhaven National Laboratory, Upton, New York 11973D. GarandPurdue University , West Lafayette , Indiana 47907F. J. M. GeurtsRice University , Houston , Texas 77251S. M. GibsonCreighton University , Omaha , Nebraska 68178M. GirardTsinghua University, Beijing 100084D. GrosnickUniversity of Houston, Houston, Texas 77204D. S. GunarathneCreighton University , Omaha , Nebraska 68178Y. GuoKent State University , Kent , Ohio 44242A. GuptaUniversity of Jammu , Jammu 180001 , IndiaSourendu GuptaUniversity of Jammu , Jammu 180001 , IndiaW. GurynUniversity of Houston, Houston, Texas 77204A. I. HamadKent State University , Kent , Ohio 44242A. HamedBrookhaven National Laboratory, Upton, New York 11973A. HarlenderovaCzech Technical University in Prague , FNSPE , Prague , 115 19 , Czech RepublicJ. W. HarrisYale University , New Haven , Connecticut 06520L. HeState University of New York, Stony Brook, New York 11794
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We report the direct virtual photon invariant yields in the transverse momentum ranges 1 < p T < 3 GeV / c and 5 < p T < 10 GeV / c at mid-rapidity derived from the dielectron invariant mass continuum region 0.10 < M e e < 0.28 GeV / c 2 for 0–80% minimum-bias Au+Au collisions at s N N = 200 GeV . A clear excess in the invariant yield compared to the nuclear overlap function T A A scaled p + p reference is observed in the p T range 1 < p T < 3 GeV / c . For p T > 6 GeV / c the production follows T A A scaling. Model calculations with contributions from thermal radiation and initial hard parton scattering are consistent within uncertainties with the direct virtual photon invariant yield.
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