Article

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>K</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>892</mml:mn><mml:mo stretchy="false">)</mml:mo><mml:msup><mml:mi/><mml:mrow><mml:mo>*</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>resonance production in Au+Au and<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: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:mspace width="0.3em"/><mml:mi fontstyle="normal">GeV</mml:mi></mml:mrow></mml:math>

J. R. AdamsUniversity of Birmingham, Birmingham, United KingdomM. M. AggarwalPanjab University, Chandigarh 160014, IndiaZ. AhammedVariable Energy Cyclotron Centre, Kolkata 700064, IndiaJ. AmonettKent State University, Kent, Ohio 44242, USAB. D. AndersonKent State University, Kent, Ohio 44242, USAD. ArkhipkinG. S. AverichevS.K. BadyalUniversity of Jammu, Jammu 180001, IndiaY. BaiNIKHEF, Amsterdam, The NetherlandsJ. BalewskiIndiana University, Bloomington, Indiana 47408, USAO. BarannikovaPurdue University, West Lafayette, Indiana 47907, USAL. S. BarnbyUniversity of Birmingham, Birmingham, United KingdomJ. BaudotS. BekeleOhio State University, Columbus, Ohio 43210, USAV. V. BelagaR. BellwiedWayne State University, Detroit, Michigan 48201, USAJ. BergerUniversity of Frankfurt, Frankfurt, GermanyB. I. BezverkhnyYale University, New Haven, Connecticut 06520, USAS. BharadwajUniversity of Rajasthan, Jaipur 302004, IndiaA. BhasinUniversity of Jammu, Jammu 180001, IndiaA. K. BhatiPanjab University, Chandigarh 160014, IndiaV.S. BhatiaPanjab University, Chandigarh 160014, IndiaH. BichselUniversity of Washington, Seattle, Washington 98195, USAA. BillmeierWayne State University, Detroit, Michigan 48201, USAL. C. BlandBrookhaven National Laboratory, Upton, New York 11973, USAC. O. BlythUniversity of Birmingham, Birmingham, United KingdomB. E. BonnerRice University, Houston, Texas 77251, USAM. BotjeNIKHEF, Amsterdam, The NetherlandsA. BouchamSUBATECH, Nantes, FranceA. V. BrandinMoscow Engineering Physics Institute, Moscow, RussiaA. BravarBrookhaven National Laboratory, Upton, New York 11973, USAM. BysterskýNuclear Physics Institute AS CR, 250 68 Rez/Prague, Czech RepublicR. V. CadmanArgonne National Laboratory, Argonne, Illinois 60439, USAX. Z. CaiShanghai Institute of Applied Physics, Shanghai 201800, ChinaH. CainesYale University, New Haven, Connecticut 06520, USAM. Calderon De La Barca SanchezIndiana University, Bloomington, Indiana 47408, USAJ. Castillo CastellanosLawrence Berkeley National Laboratory, Berkeley, California 94720, USAD. CebraUniversity of California, Davis, California 95616, USAZ. ChajęckiWarsaw University of Technology, Warsaw, PolandP. ChaloupkaNuclear Physics Institute AS CR, 250 68 Rez/Prague, Czech RepublicS. ChattopadhyayVariable Energy Cyclotron Centre, Kolkata 700064, IndiaH. F. ChenUniversity of Science & Technology of China, Anhui 230027, ChinaY. ChenUniversity of California, Los Angeles, California 90095, USAJ. ChengTsinghua University, Beijing 100084, ChinaM. CherneyCreighton University, Omaha, Nebraska 68178, USAA. ChikanianYale University, New Haven, Connecticut 06520, USAW. ChristieBrookhaven National Laboratory, Upton, New York 11973, USAJ. P. CoffinT. M. CormierWayne State University, Detroit, Michigan 48201, USAJ. G. CramerUniversity of Washington, Seattle, Washington 98195, USAH. J. CrawfordUniversity of California, Berkeley, California 94720, USAD. DasVariable Energy Cyclotron Centre, Kolkata 700064, IndiaS. DasVariable Energy Cyclotron Centre, Kolkata 700064, IndiaM. M. de MouraUniversidade de São Paulo, São Paulo, BrazilA. A. DerevschikovInstitute of High Energy Physics, Protvino, RussiaL. DidenkoBrookhaven National Laboratory, Upton, New York 11973, USAT. DietelUniversity of Frankfurt, Frankfurt, GermanyS. DograUniversity of Jammu, Jammu 180001, IndiaX. DongUniversity of California, Los Angeles, California 90095, USAJ. E. DraperUniversity of California, Davis, California 95616, USAF. DuYale University, New Haven, Connecticut 06520, USAA. K. DubeyInstitute of Physics, Bhubaneswar 751005, IndiaV. B. DuninJ. C. DunlopBrookhaven National Laboratory, Upton, New York 11973, USAM. R. Dutta MazumdarVariable Energy Cyclotron Centre, Kolkata 700064, IndiaV. EckardtMax-Planck-Institut für Physik, Munich, GermanyW. R. EdwardsLawrence Berkeley National Laboratory, Berkeley, California 94720, USAL. G. EfimovВ. ЕмеляновMoscow Engineering Physics Institute, Moscow, RussiaJ. EngelageUniversity of California, Berkeley, California 94720, USAG. EppleyRice University, Houston, Texas 77251, USAB. ErazmusSUBATECH, Nantes, FranceM. EstienneSUBATECH, Nantes, FranceP. FachiniBrookhaven National Laboratory, Upton, New York 11973, USAJ. FaivreR. FatemiIndiana University, Bloomington, Indiana 47408, USAJ. FedorišinK. FilimonovLawrence Berkeley National Laboratory, Berkeley, California 94720, USAP. FilipNuclear Physics Institute AS CR, 250 68 Rez/Prague, Czech RepublicE. FinchYale University, New Haven, Connecticut 06520, USAV. FineBrookhaven National Laboratory, Upton, New York 11973, USAY. FisyakBrookhaven National Laboratory, Upton, New York 11973, USAK. FomenkoJ. FuTsinghua University, Beijing 100084, ChinaC. A. GagliardiTexas A&M University, College Station, Texas 77843, USAL. GaillardUniversity of Birmingham, Birmingham, United KingdomJ. GansYale University, New Haven, Connecticut 06520, USAM. S. GantiVariable Energy Cyclotron Centre, Kolkata 700064, IndiaL. GaudichetSUBATECH, Nantes, FranceF. J. M. GeurtsRice University, Houston, Texas 77251, USAV. GhazikhanianUniversity of California, Los Angeles, California 90095, USAP. GhoshVariable Energy Cyclotron Centre, Kolkata 700064, IndiaJ. E. GonzalezUniversity of California, Los Angeles, California 90095, USAO. GrachovWayne State University, Detroit, Michigan 48201, USAO. G. GrebenyukNIKHEF, Amsterdam, The NetherlandsD. GrosnickValparaiso University, Valparaiso, Indiana 46383, USAS. M. GuertinUniversity of California, Los Angeles, California 90095, USAYuanyuan GuoWayne State University, Detroit, Michigan 48201, USAA. GuptaUniversity of Jammu, Jammu 180001, India

2005lv

ABI

Abstract

The short-lived $K(892){}^{*}$ resonance provides an efficient tool to probe properties of the hot and dense medium produced in relativistic heavy-ion collisions. We report measurements of ${K}^{*}$ in $\sqrt{{s}_{\mathit{NN}}}=200\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}$ Au+Au and $p+p$ collisions reconstructed via its hadronic decay channels $K(892){}^{*0}\ensuremath{\rightarrow}K\ensuremath{\pi}$ and $K(892){}^{*\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ using the STAR detector at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. The ${K}^{*0}$ mass has been studied as a function of ${p}_{T}$ in minimum bias $p+p$ and central Au+Au collisions. The ${K}^{*}\phantom{\rule{0.3em}{0ex}}{p}_{T}$ spectra for minimum bias $p+p$ interactions and for Au+Au collisions in different centralities are presented. The ${K}^{*}/K$ yield ratios for all centralities in Au+Au collisions are found to be significantly lower than the ratio in minimum bias $p+p$ collisions, indicating the importance of hadronic interactions between chemical and kinetic freeze-outs. A significant nonzero ${K}^{*0}$ elliptic flow (${v}_{2}$) is observed in Au+Au collisions and is compared to the ${K}_{S}^{0}$ and \ensuremath{\Lambda} ${v}_{2}$. The nuclear modification factor of ${K}^{*}$ at intermediate ${p}_{T}$ is similar to that of ${K}_{S}^{0}$ but different from \ensuremath{\Lambda}. This establishes a baryon-meson effect over a mass effect in the particle production at intermediate ${p}_{T}$ ($2<{p}_{T}\ensuremath{\le}4\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}/c$).

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Identifiers

DOI: 10.1103/physrevc.71.064902

Citations and references

Cited by 20 references

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