Identified particle production, azimuthal anisotropy, and interferometry measurements in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Au</mml:mi><mml:mo>+</mml:mo><mml:mi mathvariant="normal">Au</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>9</mml:mn><mml:mo>.</mml:mo><mml:mn>2</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, IndiaA. V. AlakhverdyantsJoint Institute for Nuclear Research, Dubna, RU-141980, RussiaB. D. AndersonKent State University, Kent, Ohio 44242, USAD. ArkhipkinBrookhaven National Laboratory, Upton, New York 11973, USAG. S. AverichevJoint Institute for Nuclear Research, Dubna, RU-141980, RussiaJ. BalewskiMassachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAO. BarannikovaUniversity of Illinois at Chicago, Chicago, Illinois 60607, USAL. S. BarnbyUniversity of Birmingham, Birmingham, United KingdomS. 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 NetherlandsM. 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, Prague, CZ-11519, Czech RepublicJ. BielčíkováNuclear Physics Institute AS CR, CZ-25068 Řež/Prague, Czech RepublicB. BiritzUniversity of California, Los Angeles, California 90095, USAL. C. BlandBrookhaven National Laboratory, Upton, New York 11973, USAI. BnzarovJoint Institute for Nuclear Research, Dubna, RU-141980, RussiaB. E. BonnerRice University, Houston, Texas 77251, USAJ. BouchetKent State University, Kent, Ohio 44242, USAE. BraidotNIKHEF and Utrecht University, Amsterdam, The NetherlandsA. V. BrandinMoscow Engineering Physics Institute, Moscow, RussiaA. BridgemanArgonne National Laboratory, Argonne, Illinois 60439, USAE. BrunaYale University, New Haven, Connecticut 06520, USAS. BueltmannOld Dominion University, Norfolk, Virginia, 23529, USAT. P. BurtonUniversity of Birmingham, Birmingham, United KingdomX. Z. CaiShanghai Institute of Applied Physics, Shanghai 201800, People’s Republic of ChinaH. CainesYale University, New Haven, Connecticut 06520, USAM. Calderón de la Barca SánchezUniversity of California, Davis, California 95616, USAO. CatuYale University, New Haven, Connecticut 06520, 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, USAZ. ChajęckiOhio State University, Columbus, Ohio 43210, USAP. ChaloupkaNuclear Physics Institute AS CR, CZ-25068 Řež/Prague, Czech RepublicS. ChattopadhyayVariable Energy Cyclotron Centre, Kolkata 700064, IndiaH. F. ChenUniversity of Science & Technology of China, Hefei 230026, People’s Republic of ChinaJ. H. ChenInstitute of Particle Physics, CCNU (HZNU), Wuhan 430079, People’s Republic of ChinaJ. Y. ChenInstitute of Particle Physics, CCNU (HZNU), Wuhan 430079, People’s Republic of ChinaJ. ChengTsinghua University, Beijing 100084, People’s Republic of ChinaM. CherneyCreighton University, Omaha, Nebraska 68178, USAA. ChikanianYale University, New Haven, Connecticut 06520, USAKi-Young ChoiPusan National University, Pusan, Republic of KoreaW. ChristieBrookhaven National Laboratory, Upton, New York 11973, USAP. ChungNuclear Physics Institute AS CR, CZ-25068 Řež/Prague, Czech RepublicR. F. ClarkeTexas A&M University, College Station, Texas 77843, USAM. 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, USAD. DasUniversity of California, Davis, California 95616, USAS. DashInstitute of Physics, Bhubaneswar 751005, IndiaL. C. De SilvaWayne State University, Detroit, Michigan 48201, USAR. R. DebbeBrookhaven National Laboratory, Upton, New York 11973, USAT. G. DedovichJoint Institute for Nuclear Research, Dubna, RU-141980, 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, USAP. DjawothoTexas A&M University, College Station, Texas 77843, 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, USAJ. C. DunlopBrookhaven National Laboratory, Upton, New York 11973, USAM. R. Dutta MazumdarVariable Energy Cyclotron Centre, Kolkata 700064, IndiaL. G. EfimovJoint Institute for Nuclear Research, Dubna, RU-141980, RussiaE. ElhalhuliUniversity of Birmingham, Birmingham, United KingdomM. ElnimrWayne State University, Detroit, Michigan 48201, USAJ. EngelageUniversity of California, Berkeley, California 94720, USAG. EppleyRice University, Houston, Texas 77251, USAB. ErazmusSUBATECH, Nantes, FranceM. EstienneSUBATECH, Nantes, FranceL. EunPennsylvania State University, University Park, Pennsylvania 16802, USAP. FachiniBrookhaven National Laboratory, Upton, New York 11973, USAR. FatemiUniversity of Kentucky, Lexington, Kentucky 40506-0055, USAJ. FedorišinJoint Institute for Nuclear Research, Dubna, RU-141980, RussiaR. G. FerschUniversity of Kentucky, Lexington, Kentucky 40506-0055, USAP. FilipJoint Institute for Nuclear Research, Dubna, RU-141980, RussiaE. FinchYale University, New Haven, Connecticut 06520, USAV. FineBrookhaven National Laboratory, Upton, New York 11973, USAY. FisyakBrookhaven National Laboratory, Upton, New York 11973, USAC. A. GagliardiTexas A&M University, College Station, Texas 77843, USAD. R. GangadharanUniversity of California, Los Angeles, California 90095, USAM. S. GantiVariable Energy Cyclotron Centre, Kolkata 700064, IndiaE. García-SolisUniversity of Illinois at Chicago, Chicago, Illinois 60607, USAA. GeromitsosSUBATECH, Nantes, FranceF. J. M. GeurtsRice University, Houston, Texas 77251, USAV. GhazikhanianUniversity of California, Los Angeles, California 90095, USAP. GhoshVariable Energy Cyclotron Centre, Kolkata 700064, IndiaY. N. GorbunovCreighton University, Omaha, Nebraska 68178, USAA. GordonBrookhaven National Laboratory, Upton, New York 11973, USAO. G. GrebenyukLawrence Berkeley National Laboratory, Berkeley, California 94720, USAD. GrosnickValparaiso University, Valparaiso, Indiana 46383, USA
2010lv
ABI
Аннотация
We present the first measurements of identified hadron production, azimuthal anisotropy, and pion interferometry from $\mathrm{Au}+\mathrm{Au}$ collisions below the nominal injection energy at the BNL Relativistic Heavy-Ion Collider (RHIC) facility. The data were collected using the large acceptance solenoidal tracker at RHIC (STAR) detector at $\sqrt{{s}_{\mathit{NN}}}=9.2$ GeV from a test run of the collider in the year 2008. Midrapidity results on multiplicity density $\mathit{dN}/\mathit{dy}$ in rapidity $y$, average transverse momentum $\ensuremath{\langle}{p}_{T}\ensuremath{\rangle}$, particle ratios, elliptic flow, and Hanbury-Brown--Twiss (HBT) radii are consistent with the corresponding results at similar $\sqrt{{s}_{\mathit{NN}}}$ from fixed-target experiments. Directed flow measurements are presented for both midrapidity and forward-rapidity regions. Furthermore the collision centrality dependence of identified particle $\mathit{dN}/\mathit{dy}$, $\ensuremath{\langle}{p}_{T}\ensuremath{\rangle}$, and particle ratios are discussed. These results also demonstrate that the capabilities of the STAR detector, although optimized for $\sqrt{{s}_{\mathit{NN}}}=200$ GeV, are suitable for the proposed QCD critical-point search and exploration of the QCD phase diagram at RHIC.
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