<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mi>ρ</mml:mi><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>photoproduction in ultraperipheral relativistic heavy ion collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi mathvariant="italic">NN</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>200</mml:mn></mml:mrow></mml:math>GeV
B. I. AbelevUniversity of Illinois at Chicago, Chicago, Illinois 60607, USAM. M. AggarwalPanjab University, Chandigarh 160014, IndiaZ. AhammedVariable Energy Cyclotron Centre, Kolkata 700064, IndiaB. D. AndersonKent State University, Kent, Ohio 44242, USAD. ArkhipkinParticle Physics Laboratory (JINR), Dubna, RussiaG. S. AverichevLaboratory for High Energy (JINR), Dubna, RussiaY. BaiNIKHEF and Utrecht University, Amsterdam, The NetherlandsJ. BalewskiIndiana University, Bloomington, Indiana 47408, USAO. BarannikovaUniversity of Illinois at Chicago, Chicago, Illinois 60607, USAL. S. BarnbyUniversity of Birmingham, Birmingham, United KingdomJ. BaudotS. BaumgartYale University, New Haven, Connecticut 06520, USAD. R. BeavisBrookhaven National Laboratory, Upton, New York 11973, USAR. BellwiedWayne State University, Detroit, Michigan 48201, USAF. BenedossoNIKHEF and Utrecht University, Amsterdam, The NetherlandsR. R. BettsUniversity of Illinois at Chicago, Chicago, Illinois 60607, USAS. BhardwajUniversity of Rajasthan, Jaipur 302004, IndiaA. BhasinUniversity of Jammu, Jammu 180001, IndiaA. K. BhatiPanjab University, Chandigarh 160014, IndiaH. BichselUniversity of Washington, Seattle, Washington 98195, USAJ. BielčíkNuclear Physics Institute AS CR, 250 68 e, Prague, Czech RepublicJ. BielčíkováNuclear Physics Institute AS CR, 250 68 e, Prague, Czech RepublicL. C. BlandBrookhaven National Laboratory, Upton, New York 11973, USAS.-L. BlythLawrence Berkeley National Laboratory, Berkeley, California 94720, USAM. BombaraUniversity of Birmingham, Birmingham, United KingdomB. E. BonnerRice University, Houston, Texas 77251, USAM. BotjeNIKHEF and Utrecht University, Amsterdam, The NetherlandsJ. BouchetSUBATECH, Nantes, FranceE. BraidotNIKHEF and Utrecht University, Amsterdam, The NetherlandsA. V. BrandinMoscow Engineering Physics Institute, Moscow, RussiaS. BueltmannBrookhaven National Laboratory, Upton, New York 11973, USAT. P. BurtonUniversity of Birmingham, Birmingham, United KingdomM. BysterskýNuclear Physics Institute AS CR, 250 68 e, Prague, Czech RepublicX. Z. CaiShanghai Institute of Applied Physics, Shanghai 201800, ChinaM. Calderon De La Barca SanchezUniversity of California, Davis, Davis, United StatesJ. CallnerUniversity of Illinois at Chicago, Chicago, Illinois 60607, USAO. CatuYale University, New Haven, Connecticut 06520, USAD. CebraUniversity of California, Davis, California 95616, USAM. C. CervantesTexas A&M University, College Station, Texas 77843, USAZ. ChajęckiOhio State University, Columbus, Ohio 43210, USAP. ChaloupkaNuclear Physics Institute AS CR, 250 68 e, Prague, Czech RepublicS. ChattopadhyayVariable Energy Cyclotron Centre, Kolkata 700064, IndiaH. F. ChenUniversity of Science & Technology of China, Hefei 230026, ChinaJ. H. ChenInstitute of Particle Physics, CCNU (HZNU), Wuhan 430079, ChinaJ. Y. ChenInstitute of Particle Physics, CCNU (HZNU), Wuhan 430079, ChinaJ. ChengTsinghua University, Beijing 100084, ChinaM. CherneyCreighton University, Omaha, Nebraska 68178, USAA. ChikanianYale University, New Haven, Connecticut 06520, USAK. ChoiPusan National University, Pusan, Republic of KoreaW. ChristieBrookhaven National Laboratory, Upton, New York 11973, USAS. U. ChungBrookhaven National Laboratory, Upton, New York 11973, USAR. F. ClarkeTexas A&M University, College Station, Texas 77843, USAM. J. M. CodringtonTexas A&M University, College Station, Texas 77843, USAJ. P. CoffinT. M. CormierWayne State University, Detroit, Michigan 48201, USAM. R. CosentinoUniversidade de Sao Paulo, Sao Paulo, BrazilJ. G. CramerUniversity of Washington, Seattle, Washington 98195, USAH. J. CrawfordUniversity of California, Berkeley, California 94720, USAD. DasUniversity of California, Davis, California 95616, USAS. DashInstitute of Physics, Bhubaneswar 751005, IndiaM. DaugherityUniversity of Texas, Austin, Texas 78712, USAM. M. de MouraUniversidade de Sao Paulo, Sao Paulo, BrazilT. G. DedovichLaboratory for High Energy (JINR), Dubna, RussiaM. DePhillipsBrookhaven National Laboratory, Upton, New York 11973, USAA. A. DerevschikovInstitute of High Energy Physics, Protvino, RussiaR. Derradi de SouzaUniversidade Estadual de Campinas, Sao Paulo, BrazilL. DidenkoBrookhaven National Laboratory, Upton, New York 11973, USAT. DietelUniversity of Frankfurt, Frankfurt, GermanyP. DjawothoIndiana University, Bloomington, Indiana 47408, USAS. DograUniversity of Jammu, Jammu 180001, IndiaX. 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, USAF. DuYale University, New Haven, Connecticut 06520, USAJ. C. DunlopBrookhaven National Laboratory, Upton, New York 11973, USAM. R. Dutta MazumdarVariable Energy Cyclotron Centre, Kolkata 700064, IndiaW. R. EdwardsLawrence Berkeley National Laboratory, Berkeley, California 94720, USAL. G. EfimovLaboratory for High Energy (JINR), Dubna, RussiaE. ElhalhuliUniversity of Birmingham, Birmingham, United KingdomВ. ЕмеляновMoscow Engineering Physics Institute, Moscow, RussiaJ. EngelageUniversity of California, Berkeley, California 94720, USAG. EppleyRice University, Houston, Texas 77251, USAB. ErazmusSUBATECH, Nantes, FranceM. EstienneL. EunPennsylvania State University, University Park, Pennsylvania 16802, USAP. FachiniBrookhaven National Laboratory, Upton, New York 11973, USAR. FatemiUniversity of Kentucky, Lexington, Kentucky 40506-0055, USAJ. FedorišinLaboratory for High Energy (JINR), Dubna, RussiaA. FengInstitute of Particle Physics, CCNU (HZNU), Wuhan 430079, ChinaP. FilipParticle Physics Laboratory (JINR), Dubna, RussiaE. FinchYale University, New Haven, Connecticut 06520, USAV. FineBrookhaven National Laboratory, Upton, New York 11973, USAY. FisyakBrookhaven National Laboratory, Upton, New York 11973, USAJ. FuInstitute of Particle Physics, CCNU (HZNU), Wuhan 430079, ChinaC. A. GagliardiTexas A&M University, College Station, Texas 77843, USAL. GaillardUniversity of Birmingham, Birmingham, United KingdomM. S. GantiVariable Energy Cyclotron Centre, Kolkata 700064, IndiaE. García-SolisUniversity of Illinois at Chicago, Chicago, Illinois 60607, USAV. GhazikhanianUniversity of California, Los Angeles, California 90095, USA
ABI
Аннотация
Photoproduction reactions occur when the electromagnetic field of a relativistic heavy ion interacts with another heavy ion. The STAR Collaboration presents a measurement of 0 and direct + -photoproduction in ultraperipheral relativistic heavy ion collisions at s NN = 200 GeV. We observe both exclusive photoproduction and photoproduction accompanied by mutual Coulomb excitation. We find a coherent cross section of (AuAu Au * Au * 0 ) = 530 19(stat.) 57(syst.) mb, in accord with theoretical calculations based on a Glauber approach, but considerably below the predictions of a color dipole model. The 0 transverse momentum spectrum (p 2 T ) is fit by a double exponential curve including both coherent and incoherent coupling to the target nucleus; we find inc / coh = 0.29
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