ϕ meson production in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi mathvariant="normal">Au</mml:mi><mml:mo>+</mml:mo><mml:mi mathvariant="normal">Au</mml:mi></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" overflow="scroll"><mml:mi>p</mml:mi><mml:mo>+</mml:mo><mml:mi>p</mml:mi></mml:math> collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si3.gif" overflow="scroll"><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>200</mml:mn><mml:mspace width="0.25em"/><mml:mtext>GeV</mml:mtext></mml:math>
J. R. AdamsUniversity of Birmingham, Birmingham, United KingdomC. AdlerGoethe University Frankfurt, Frankfurt am Main, GermanyM. M. AggarwalPanjab University, Chandigarh, IndiaZ. AhammedVariable Energy Cyclotron Centre, Kolkata, IndiaJ. AmonettKent State University, Kent, United StatesB. D. AndersonKent State University, Kent, United StatesD. ArkhipkinJoint Institute for Nuclear Research, Dubna, RussiaG. S. AverichevJoint Institute for Nuclear Research, Dubna, RussiaS.K. BadyalUniversity of Jammu, Jammu, IndiaJ. BalewskiIndiana University, Bloomington, United StatesO. BarannikovaJoint Institute for Nuclear Research, Dubna, RussiaL. S. BarnbyUniversity of Birmingham, Birmingham, United KingdomJ. BaudotS. BekeleThe Ohio State University, Columbus, United StatesV. V. BelagaJoint Institute for Nuclear Research, Dubna, RussiaR. BellwiedWayne State University, Detroit, United StatesJ. BergerGoethe University Frankfurt, Frankfurt am Main, GermanyB. I. BezverkhnyYale University, New Haven, United StatesS. BhardwajUniversity of Rajasthan, Jaipur, IndiaA. K. BhatiPanjab University, Chandigarh, IndiaH. BichselUniversity of Washington, Seattle, United StatesA. BillmeierWayne State University, Detroit, United StatesL. C. BlandBrookhaven National Laboratory, Upton, United StatesC. O. BlythUniversity of Birmingham, Birmingham, United KingdomB. E. BonnerRice University, Houston, United StatesM. BotjeKent State University, Kent, OH 44242, USAA. BouchamA. V. BrandinMoscow Engineering Physics Institute, Moscow, RussiaA. BravarBrookhaven National Laboratory, Upton, United StatesR. V. CadmanArgonne National Laboratory, Lemont, United StatesX. Z. CaiAcademia Sinica, Taipei, TaiwanM. Calderon De La Barca SanchezBrookhaven National Laboratory, Upton, United StatesJ. CarrollLawrence Berkeley National Laboratory, Berkeley, United StatesJ. Castillo CastellanosLawrence Berkeley National Laboratory, Berkeley, United StatesD. CebraUniversity of California, Davis, Davis, United StatesP. ChaloupkaCzech Academy of Sciences, Prague, CzechiaS. ChattopadhyayVariable Energy Cyclotron Centre, Kolkata, IndiaH. F. ChenUniversity of Science and Technology of China, Hefei, ChinaY. ChenUniversity of California, Los Angeles, Los Angeles, United StatesS. ChernenkoJoint Institute for Nuclear Research, Dubna, RussiaM. CherneyCreighton University, Omaha, United StatesA. ChikanianYale University, New Haven, United StatesW. ChristieBrookhaven National Laboratory, Upton, United StatesJ. P. CoffinT. M. CormierWayne State University, Detroit, United StatesJ. G. CramerUniversity of Washington, Seattle, United StatesH. J. CrawfordUniversity of California, Berkeley, Berkeley, United StatesD. DasVariable Energy Cyclotron Centre, Kolkata, IndiaS. DasVariable Energy Cyclotron Centre, Kolkata, IndiaA. A. DerevschikovL. DidenkoBrookhaven National Laboratory, Upton, United StatesT. DietelGoethe University Frankfurt, Frankfurt am Main, GermanyX. DongUniversity of California, Los Angeles, Los Angeles, United StatesJ. E. DraperUniversity of California, Davis, Davis, United StatesF. DuYale University, New Haven, United StatesA. K. DubeyInstitute of Physics, Bhubaneshwar, Bhubaneswar, IndiaV. B. DuninJoint Institute for Nuclear Research, Dubna, RussiaJ. C. DunlopBrookhaven National Laboratory, Upton, United StatesM. R. Dutta MajumdarVariable Energy Cyclotron Centre, Kolkata, IndiaV. EckardtMax Planck Society, Munich, GermanyL. G. EfimovJoint Institute for Nuclear Research, Dubna, RussiaВ. ЕмеляновMoscow Engineering Physics Institute, Moscow, RussiaJ. EngelageUniversity of California, Berkeley, Berkeley, United StatesG. EppleyRice University, Houston, United StatesB. ErazmusPanjab University, Chandigarh 160014, IndiaM. EstienneKent State University, Kent, OH 44242, USAP. FachiniBrookhaven National Laboratory, Upton, United StatesV. FaineBrookhaven National Laboratory, Upton, United StatesJ. FaivreUniversity of Rajasthan, Jaipur 302004, IndiaR. FatemiIndiana University, Bloomington, United StatesK. FilimonovLawrence Berkeley National Laboratory, Berkeley, United StatesP. FilipCzech Academy of Sciences, Prague, CzechiaE. FinchYale University, New Haven, United StatesY. FisyakBrookhaven National Laboratory, Upton, United StatesD. FlierlGoethe University Frankfurt, Frankfurt am Main, GermanyK. J. FoleyBrookhaven National Laboratory, Upton, United StatesJ. FuCentral China Normal University, Wuhan, ChinaC. A. GagliardiTexas A&M University, College Station, United StatesN. GagunashviliJoint Institute for Nuclear Research, Dubna, RussiaJ. GansYale University, New Haven, United StatesM. S. GantiVariable Energy Cyclotron Centre, Kolkata, IndiaL. GaudichetWayne State University, Detroit, MI 48201, USAM. GermainKent State University, Kent, OH 44242, USAF. J. M. GeurtsRice University, Houston, United StatesV. GhazikhanianUniversity of California, Los Angeles, Los Angeles, United StatesP. GhoshVariable Energy Cyclotron Centre, Kolkata, IndiaJ. E. GonzalezUniversity of California, Los Angeles, Los Angeles, United StatesO. GrachovWayne State University, Detroit, United StatesO. G. GrebenyukS. GronstalCreighton University, Omaha, United StatesD. GrosnickValparaiso University, Valparaiso, United StatesM. GuedonKent State University, Kent, OH 44242, USAS. M. GuertinUniversity of California, Los Angeles, Los Angeles, United StatesA. GuptaUniversity of Jammu, Jammu, IndiaT. D. GutierrezUniversity of California, Davis, Davis, United StatesT. J. HallmanBrookhaven National Laboratory, Upton, United StatesA. HamedWayne State University, Detroit, United StatesD. HardtkeLawrence Berkeley National Laboratory, Berkeley, United States
2005lv
ABI
Аннотация
We report the STAR measurement of Phi meson production in Au+Au and p+p collisions at sqrt (s)=200 GeV. Using the event mixing technique, the Phi spectra and yields are obtained at mid-rapidity for five centrality bins in Au+Au collisions and for non-singly-diffractive p+p collisions. It is found that the Phi transverse momentum distributions from Au+Au collisions are better fitted with a single-exponential while the p+p spectrum is better described by a double-exponential distribution. The measured nuclear modification factors indicate that Phi production in central Au+Au collisions is suppressed relative to peripheral collisions when scaled by the number of binary collisions. The systematics of <pt> versus centrality and the constant Phi/K- ratio versus beam species, centrality, and collision energy rule out kaon coalescence as the dominant mechanism for Phi production.
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