Di-electron spectrum at mid-rapidity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>p</mml:mi><mml:mo>+</mml:mo><mml:mi>p</mml:mi></mml:mrow></mml:math>collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>200</mml:mn></mml:mrow></mml:math>GeV
L. AdamczykAGH University of Science and Technology, Krakow, PolandG. AgakishievJoint Institute for Nuclear Research, Dubna 141 980, RussiaM. M. AggarwalPanjab University, Chandigarh 160014, IndiaZ. AhammedVariable Energy Cyclotron Centre, Kolkata 700064, IndiaA. V. AlakhverdyantsJoint Institute for Nuclear Research, Dubna 141 980, RussiaI. AlekseevAlikhanov Institute for Theoretical and Experimental Physics, Moscow, RussiaJ. AlfordKent State University, Kent, Ohio 44242, USAB. D. AndersonKent State University, Kent, Ohio 44242, USAC. AnsonOhio State University, Columbus, Ohio 43210, USAD. ArkhipkinBrookhaven National Laboratory, Upton, New York 11973, USAE. C. AschenauerBrookhaven National Laboratory, Upton, New York 11973, USAG. S. AverichevJoint Institute for Nuclear Research, Dubna 141 980, RussiaJ. BalewskiMassachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAA. BanerjeeVariable Energy Cyclotron Centre, Kolkata 700064, IndiaZ. BarnovskaNuclear Physics Institute AS CR, 250 68 e/Prague, Czech RepublicD. R. BeavisBrookhaven National Laboratory, Upton, New York 11973, USAR. BellwiedUniversity of Houston, Houston, Texas 77204, USAM. BetancourtMassachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAR. R. BettsUniversity of Illinois at Chicago, Chicago, Illinois 60607, USAA. BhasinUniversity of Jammu, Jammu 180001, IndiaA. K. BhatiPanjab University, Chandigarh 160014, IndiaH. BichselUniversity of Washington, Seattle, Washington 98195, USAJ. BielčíkCzech Technical University in Prague, FNSPE, 115 19 Prague, Czech RepublicJ. BielčíkováNuclear Physics Institute AS CR, 250 68 e/Prague, Czech RepublicL. C. BlandBrookhaven National Laboratory, Upton, New York 11973, USAI. G. BordyuzhinAlikhanov Institute for Theoretical and Experimental Physics, Moscow, RussiaW. BorowskiSUBATECH, Nantes, FranceJ. BouchetKent State University, Kent, Ohio 44242, USAA. V. BrandinMoscow Engineering Physics Institute, Moscow, RussiaS. G. BrovkoUniversity of California, Davis, California 95616, USAE. BrunaYale University, New Haven, Connecticut 06520, USAS. BueltmannOld Dominion University, Norfolk, Virginia 23529, USAI. BunzarovJoint Institute for Nuclear Research, Dubna 141 980, RussiaT. P. BurtonBrookhaven National Laboratory, Upton, New York 11973, USAJ. M. ButterworthRice University, Houston, Texas 77251, USAX. Z. CaiShanghai Institute of Applied Physics, Shanghai 201800, ChinaH. CainesYale University, New Haven, Connecticut 06520, USAM. Calderón de la Barca SánchezUniversity of California, Davis, California 95616, USAD. CebraUniversity of California, Davis, California 95616, USAR. CendejasUniversity of California, Los Angeles, California 90095, USAM. C. CervantesTexas A&M University, College Station, Texas 77843, USAP. ChaloupkaNuclear Physics Institute AS CR, 250 68 e/Prague, Czech RepublicZ. ChangTexas A&M University, College Station, Texas 77843, USAS. ChattopadhyayVariable Energy Cyclotron Centre, Kolkata 700064, IndiaH. F. ChenUniversity of Science & Technology of China, Hefei 230026, ChinaJ. H. ChenCentral China Normal University (HZNU), Wuhan 430079, ChinaJ. Y. ChenCentral China Normal University (HZNU), Wuhan 430079, ChinaL. ChenCentral China Normal University (HZNU), Wuhan 430079, ChinaJ. ChengCentral China Normal University (HZNU), Wuhan 430079, ChinaM. CherneyCreighton University, Omaha, Nebraska 68178, USAA. ChikanianYale University, New Haven, Connecticut 06520, USAW. ChristieBrookhaven National Laboratory, Upton, New York 11973, USAP. ChungNuclear Physics Institute AS CR, 250 68 e/Prague, Czech RepublicJ. J. ChwastowskiM. J. M. CodringtonTexas A&M University, College Station, Texas 77843, USAR. CorlissMassachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAJ. G. CramerUniversity of Washington, Seattle, Washington 98195, USAH. J. CrawfordUniversity of California, Berkeley, California 94720, USAX.Y. CuiUniversity of Science & Technology of China, Hefei 230026, ChinaA. Davila LeyvaUniversity of Texas, Austin, Texas 78712, USAL. C. de SilvaUniversity of Houston, Houston, Texas 77204, USAR. R. DebbeBrookhaven National Laboratory, Upton, New York 11973, USAT. G. DedovichJoint Institute for Nuclear Research, Dubna 141 980, RussiaJ. DengShandong University, Jinan, Shandong 250100, ChinaR. Derradi de SouzaUniversidade Estadual de Campinas, Sao Paulo, BrazilS. DhamijaIndiana University, Bloomington, Indiana 47408, USAL. DidenkoBrookhaven National Laboratory, Upton, New York 11973, USAF. DingUniversity of California, Davis, California 95616, USAA. DionBrookhaven National Laboratory, Upton, New York 11973, USAP. DjawothoTexas A&M University, College Station, Texas 77843, USAX. DongLawrence Berkeley National Laboratory, Berkeley, California 94720, USAJ. L. DrachenbergTexas A&M University, College Station, Texas 77843, USAJ. E. DraperUniversity of California, Davis, California 95616, USAC. M. DuInstitute of Modern Physics, Lanzhou, ChinaL. E. DunkelbergerUniversity of California, Los Angeles, California 90095, USAJ. C. DunlopBrookhaven National Laboratory, Upton, New York 11973, USAL. G. EfimovJoint Institute for Nuclear Research, Dubna 141 980, RussiaM. ElnimrWayne State University, Detroit, Michigan 48201, USAJ. EngelageUniversity of California, Berkeley, California 94720, USAG. EppleyRice University, Houston, Texas 77251, USAL. EunLawrence Berkeley National Laboratory, Berkeley, California 94720, USAO. EvdokimovUniversity of Illinois at Chicago, Chicago, Illinois 60607, USAR. FatemiUniversity of Kentucky, Lexington, Kentucky 40506-0055, USAS. FazioBrookhaven National Laboratory, Upton, New York 11973, USAJ. FedorišinJoint Institute for Nuclear Research, Dubna 141 980, RussiaR. G. FerschUniversity of Kentucky, Lexington, Kentucky 40506-0055, USAP. FilipJoint Institute for Nuclear Research, Dubna 141 980, RussiaE. FinchYale University, New Haven, Connecticut 06520, USAY. FisyakBrookhaven National Laboratory, Upton, New York 11973, USAC. A. GagliardiTexas A&M University, College Station, Texas 77843, USAD. R. GangadharanOhio State University, Columbus, Ohio 43210, USAF. J. M. GeurtsRice University, Houston, Texas 77251, USAS. M. GibsonValparaiso University, Valparaiso, Indiana 46383, USAS. GliskeArgonne National Laboratory, Argonne, Illinois 60439, USAY. N. GorbunovCreighton University, Omaha, Nebraska 68178, USAO. G. GrebenyukLawrence Berkeley National Laboratory, Berkeley, California 94720, USAD. GrosnickValparaiso University, Valparaiso, Indiana 46383, USAS. K. GuptaUniversity of Jammu, Jammu 180001, IndiaW. GurynBrookhaven National Laboratory, Upton, New York 11973, USAB. HaagUniversity of California, Davis, California 95616, USA
ABI
Аннотация
We report on the mid-rapidity mass spectrum of di-electrons and cross sections of pseudoscalar and vector mesons via e + e -decays, from s = 200 GeV p + p collisions, measured by the large-acceptance experiment STAR at the Relativistic Heavy Ion Collider. The ratio of the di-electron continuum to the combinatorial background is larger than 10% over the entire mass range. Simulations of di-electrons from light-meson decays and heavy-flavor decays (charmonium and open charm correlation) are found to describe the data. The extracted e + e -invariant yields are consistent with previous measurements. The mid-rapidity yields (dN/dy) of and J / are extracted through their di-electron decay channels and are consistent with the previous measurements of K + K -and J / e + e -. Our results suggest a new
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