Energy and system size dependence of ϕ meson production in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi mathvariant="normal">Cu</mml:mi><mml:mo>+</mml:mo><mml:mi mathvariant="normal">Cu</mml:mi></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" overflow="scroll"><mml:mi mathvariant="normal">Au</mml:mi><mml:mo>+</mml:mo><mml:mi mathvariant="normal">Au</mml:mi></mml:math> collisions
B. I. AbelevUniversity of Illinois at Chicago, Chicago, IL 60607, United StatesM. M. AggarwalPanjab University, Chandigarh 160014, IndiaZ. AhammedVariable Energy Cyclotron Centre, Kolkata 700064, IndiaB. D. AndersonKent State University, Kent, OH 44242, United StatesD. ArkhipkinParticle Physics Laboratory (JINR), Dubna, RussiaG. S. AverichevLaboratory for High Energy (JINR), Dubna, RussiaY. BaiNIKHEF and Utrecht University, Amsterdam, The NetherlandsJ. BalewskiMassachusetts Institute of Technology, Cambridge, MA 02139-4307, United StatesO. BarannikovaUniversity of Illinois at Chicago, Chicago, IL 60607, United StatesL. S. BarnbyUniversity of Birmingham, Birmingham, United KingdomJ. BaudotS. BaumgartYale University, New Haven, CT 06520, United StatesD. R. BeavisBrookhaven National Laboratory, Upton, NY 11973, United StatesR. BellwiedWayne State University, Detroit, MI 48201, United StatesF. BenedossoNIKHEF and Utrecht University, Amsterdam, The NetherlandsM. BetancourtMassachusetts Institute of Technology, Cambridge, MA 02139-4307, United StatesR. R. BettsUniversity of Illinois at Chicago, Chicago, IL 60607, United StatesS. BharadwajUniversity of Rajasthan, Jaipur 302004, IndiaA. BhasinUniversity of Jammu, Jammu 180001, IndiaA. K. BhatiPanjab University, Chandigarh 160014, IndiaH. BichselUniversity of Washington, Seattle, United StatesJ. BielčíkCzech Academy of Sciences, Prague, CzechiaJ. BielčíkováCzech Academy of Sciences, Prague, CzechiaB. BiritzUniversity of California, Los Angeles, Los Angeles, United StatesL. C. BlandBrookhaven National Laboratory, Upton, United StatesM. BombaraUniversity of Birmingham, Birmingham, United KingdomB. E. BonnerRice University, Houston, United StatesM. BotjeUtrecht University, Utrecht, The NetherlandsJ. BouchetKent State University, Kent, United StatesE. BraidotUtrecht University, Utrecht, The NetherlandsA. V. BrandinMoscow Engineering Physics Institute, Moscow, RussiaE. BrunaYale University, New Haven, United StatesS. BueltmannOld Dominion University, Norfolk, United StatesT. P. BurtonUniversity of Birmingham, Birmingham, United KingdomM. BysterskýCzech Academy of Sciences, Prague, CzechiaX. Z. CaiChinese Academy of Sciences, Beijing, ChinaM. Calderon De La Barca SanchezUniversity of California, Davis, Davis, United StatesJ. CallnerUniversity of Illinois at Chicago, Chicago, United StatesO. CatuYale University, New Haven, United StatesD. CebraUniversity of California, Davis, Davis, United StatesR. CendejasUniversity of California, Los Angeles, Los Angeles, United StatesM. C. CervantesTexas A&M University, College Station, United StatesZ. ChajęckiThe Ohio State University, Columbus, United StatesP. ChaloupkaCzech Academy of Sciences, Prague, CzechiaS. ChattopadhyayVariable Energy Cyclotron Centre, Kolkata, IndiaH.F. ChenUniversity of Science and Technology of China, Hefei, ChinaJ. H. ChenChinese Academy of Sciences, Beijing, ChinaJ.Y. ChenInstitute of Particle Physics, CCNU (HZNU), Wuhan 430079, ChinaJ. ChengTsinghua University, Beijing, ChinaM. CherneyCreighton University, Omaha, United StatesA. ChikanianYale University, New Haven, United StatesKi-Young ChoiPusan National University, Busan, South KoreaW. ChristieBrookhaven National Laboratory, Upton, United StatesS. U. ChungBrookhaven National Laboratory, Upton, United StatesR. F. ClarkeTexas A&M University, College Station, United StatesM. J. M. CodringtonTexas A&M University, College Station, United StatesJ. P. CoffinR. CorlissMassachusetts Institute of Technology, Cambridge, United StatesT. M. CormierWayne State University, Detroit, United StatesM. R. CosentinoUniversidade de São Paulo, São Paulo, BrazilJ. G. CramerUniversity of Washington, Seattle, United StatesH. J. CrawfordUniversity of California, Berkeley, Berkeley, United StatesD. DasUniversity of California, Davis, Davis, United StatesS. DashInstitute of Physics, Bhubaneshwar, Bhubaneswar, IndiaM. DaugherityThe University of Texas at Austin, Austin, United StatesC. De SilvaWayne State University, Detroit, United StatesT. G. DedovichJoint Institute for Nuclear Research, Dubna, RussiaM. DePhillipsBrookhaven National Laboratory, Upton, United StatesA. A. DerevschikovInstitute of High Energy Physics, Protvino, RussiaR. Derradi de SouzaUniversidade Estadual de Campinas (UNICAMP), Campinas, BrazilL. DidenkoBrookhaven National Laboratory, Upton, United StatesP. DjawothoIndiana University, Bloomington, United StatesS. DograUniversity of Jammu, Jammu, IndiaX. DongLawrence Berkeley National Laboratory, Berkeley, United StatesJ. L. DrachenbergTexas A&M University, College Station, United StatesJ. E. DraperUniversity of California, Davis, Davis, United StatesF. DuYale University, New Haven, United StatesJ. C. DunlopBrookhaven National Laboratory, Upton, United StatesM. R. Dutta MazumdarVariable Energy Cyclotron Centre, Kolkata, IndiaW. R. EdwardsLawrence Berkeley National Laboratory, Berkeley, United StatesL. G. EfimovJoint Institute for Nuclear Research, Dubna, RussiaE. ElhalhuliUniversity of Birmingham, Birmingham, United KingdomM. ElnimrWayne State University, Detroit, United StatesВ. ЕмеляновMoscow Engineering Physics Institute, Moscow, RussiaJ. EngelageUniversity of California, Berkeley, Berkeley, United StatesG. EppleyRice University, Houston, United StatesB. ErazmusPanjab University, Chandigarh 160014, IndiaM. EstienneMassachusetts Institute of Technology, Cambridge, MA 02139-4307, United StatesL. EunPennsylvania State University, State College, United StatesP. FachiniBrookhaven National Laboratory, Upton, United StatesR. FatemiUniversity of Kentucky, Lexington, United StatesJ. FedorišinJoint Institute for Nuclear Research, Dubna, RussiaA. FengInstitute of Particle Physics, CCNU (HZNU), Wuhan 430079, ChinaP. FilipJoint Institute for Nuclear Research, Dubna, RussiaE. FinchYale University, New Haven, United StatesV. FineBrookhaven National Laboratory, Upton, United StatesY. FisyakBrookhaven National Laboratory, Upton, United StatesC. A. GagliardiTexas A&M University, College Station, United StatesL. GaillardUniversity of Birmingham, Birmingham, United Kingdom
2009lv
ABI
Аннотация
We study the beam-energy and system-size dependence of ϕ meson production (using the hadronic decay mode ϕ→K+K−) by comparing the new results from Cu+Cu collisions and previously reported Au+Au collisions at sNN=62.4 and 200 GeV measured in the STAR experiment at RHIC. Data presented in this Letter are from mid-rapidity (|y|<0.5) for 0.4<pT<5 GeV/c. At a given beam energy, the transverse momentum distributions for ϕ mesons are observed to be similar in yield and shape for Cu+Cu and Au+Au colliding systems with similar average numbers of participating nucleons. The ϕ meson yields in nucleus–nucleus collisions, normalized by the average number of participating nucleons, are found to be enhanced relative to those from p+p collisions. The enhancement for ϕ mesons lies between strange hadrons having net strangeness =1 (K− and Λ¯) and net strangeness =2 (Ξ). The enhancement for ϕ mesons is observed to be higher at sNN=200 GeV compared to 62.4 GeV. These observations for the produced ϕ(ss¯) mesons clearly suggest that, at these collision energies, the source of enhancement of strange hadrons is related to the formation of a dense partonic medium in high energy nucleus–nucleus collisions and cannot be alone due to canonical suppression of their production in smaller systems.
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