Beam-Energy Dependence of the Directed Flow of Protons, Antiprotons, and Pions in Au+Au Collisions
L. AdamczykAGH University of Science and Technology, Cracow, PolandJ. K. AdkinsUniversity of Kentucky, Lexington, Kentucky, 40506-0055, USAG. AgakishievJoint Institute for Nuclear Research, Dubna 141 980, RussiaM. M. AggarwalPanjab University, Chandigarh 160014, IndiaZ. AhammedVariable Energy Cyclotron Centre, Kolkata 700064, IndiaI. AlekseevAlikhanov Institute for Theoretical and Experimental Physics, Moscow, RussiaJ. AlfordKent State University, Kent, Ohio 44242, USAC. AnsonOhio State University, Columbus, Ohio 43210, USAA. AparinJoint Institute for Nuclear Research, Dubna 141 980, RussiaD. ArkhipkinBrookhaven National Laboratory, Upton, New York 11973, USAE. C. AschenauerBrookhaven National Laboratory, Upton, New York 11973, USAG. S. AverichevJoint Institute for Nuclear Research, Dubna 141 980, RussiaA. BanerjeeVariable Energy Cyclotron Centre, Kolkata 700064, IndiaD. R. BeavisBrookhaven National Laboratory, Upton, New York 11973, USAR. BellwiedUniversity of Houston, Houston, Texas 77204, USAA. BhasinUniversity of Jammu, Jammu 180001, IndiaA. K. BhatiPanjab University, Chandigarh 160014, IndiaP. BhattaraiUniversity of Texas, Austin, Texas 78712, USAH. BichselUniversity of Washington, Seattle, Washington 98195, USAJ. BielčíkCzech Technical University in Prague, FNSPE, Prague 115 19, Czech RepublicJ. BielčíkováNuclear Physics Institute AS CR, 250 68 Řež/Prague, Czech RepublicL. C. BlandBrookhaven National Laboratory, Upton, New York 11973, USAI. G. BordyuzhinAlikhanov Institute for Theoretical and Experimental Physics, Moscow, RussiaW. BorowskiSUBATECH, Nantes, FranceJ. BouchetKent State University, Kent, Ohio 44242, USAA. V. BrandinMoscow Engineering Physics Institute, Moscow, RussiaS. G. BrovkoUniversity of California, Davis, California 95616, USAS. BültmannOld Dominion University, Norfolk, Virginia 23529, USAI. BunzarovJoint Institute for Nuclear Research, Dubna 141 980, RussiaT. P. BurtonBrookhaven National Laboratory, Upton, New York 11973, USAJ. M. ButterworthRice University, Houston, Texas 77251, USAH. CainesYale University, New Haven, Connecticut 06520, USAM. Calderón de la Barca SánchezUniversity of California, Davis, California 95616, USAD. CebraUniversity of California, Davis, California 95616, USAR. CendejasPennsylvania State University, University Park, Pennsylvania 16802, USAM. C. CervantesTexas A&M University, College Station, Texas 77843, USAP. ChaloupkaCzech Technical University in Prague, FNSPE, Prague 115 19, Czech RepublicZ. ChangTexas A&M University, College Station, Texas 77843, USAS. ChattopadhyayVariable Energy Cyclotron Centre, Kolkata 700064, IndiaH. F. ChenUniversity of Science and Technology of China, Hefei 230026, ChinaJ. H. ChenShanghai Institute of Applied Physics, Shanghai 201800, ChinaL. ChenCentral China Normal University (HZNU), Wuhan 430079, ChinaJ. 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. J. ChwastowskiCracow University of Technology, Cracow, PolandM. J. M. CodringtonUniversity of Texas, Austin, Texas 78712, USAG. ContinLawrence Berkeley National Laboratory, Berkeley, California 94720, USAJ. G. CramerUniversity of Washington, Seattle, Washington 98195, USAH. J. CrawfordUniversity of California, Berkeley, California 94720, USAX.Y. CuiUniversity of Science and Technology of China, Hefei 230026, ChinaS. DasInstitute of Physics, Bhubaneswar 751005, IndiaA. Davila LeyvaUniversity of Texas, Austin, Texas 78712, USAL. C. De SilvaCreighton University, Omaha, Nebraska 68178, USAR. R. DebbeBrookhaven National Laboratory, Upton, New York 11973, USAТ. Г. ДедовичJoint Institute for Nuclear Research, Dubna 141 980, RussiaJ. DengShandong University, Jinan, Shandong 250100, ChinaA. A. DerevschikovInstitute of High Energy Physics, Protvino, RussiaR. Derradi de SouzaUniversidade Estadual de Campinas, Sao Paulo, BrazilS. DhamijaIndiana University, Bloomington, Indiana 47408, USAB. Di RuzzaBrookhaven National Laboratory, Upton, New York 11973, USAL. DidenkoBrookhaven National Laboratory, Upton, New York 11973, USAC. DilksPennsylvania State University, University Park, Pennsylvania 16802, USAF. DingUniversity of California, Davis, California 95616, USAP. DjawothoTexas A&M University, College Station, Texas 77843, USAX. DongLawrence Berkeley National Laboratory, Berkeley, California 94720, USAJ. L. DrachenbergValparaiso University, Valparaiso, Indiana 46383, USAJ. E. DraperUniversity of California, Davis, California 95616, USAC. M. DuInstitute of Modern Physics, Lanzhou, ChinaL. E. DunkelbergerUniversity of California, Los Angeles, California 90095, USAJ. C. DunlopBrookhaven National Laboratory, Upton, New York 11973, USAL. G. EfimovJoint Institute for Nuclear Research, Dubna 141 980, RussiaJ. EngelageUniversity of California, Berkeley, California 94720, USAK. S. EngleUnited States Naval Academy, Annapolis, Maryland, 21402, USAG. EppleyRice University, Houston, Texas 77251, USAL. EunLawrence Berkeley National Laboratory, Berkeley, California 94720, USAO. EvdokimovUniversity of Illinois at Chicago, Chicago, Illinois 60607, USAO. EyserBrookhaven National Laboratory, Upton, New York 11973, USAR. FatemiUniversity of Kentucky, Lexington, Kentucky, 40506-0055, USAS. FazioBrookhaven National Laboratory, Upton, New York 11973, USAJ. FedorišinJoint Institute for Nuclear Research, Dubna 141 980, RussiaP. FilipJoint Institute for Nuclear Research, Dubna 141 980, RussiaE. FinchYale University, New Haven, Connecticut 06520, USAY. FisyakBrookhaven National Laboratory, Upton, New York 11973, USAC. E. FloresUniversity of California, Davis, California 95616, USAC. A. GagliardiTexas A&M University, College Station, Texas 77843, USAD. R. GangadharanOhio State University, Columbus, Ohio 43210, USAD. GarandPurdue University, West Lafayette, Indiana 47907, USAF. J. M. GeurtsRice University, Houston, Texas 77251, USAS. M. GibsonValparaiso University, Valparaiso, Indiana 46383, USAM. Fusco GirardWarsaw University of Technology, Warsaw, PolandS. GliskeArgonne National Laboratory, Argonne, Illinois 60439, USAL. GreinerLawrence Berkeley National Laboratory, Berkeley, California 94720, USAD. GrosnickValparaiso University, Valparaiso, Indiana 46383, USAD. S. GunarathneTemple University, Philadelphia, Pennsylvania 19122, USAYuhan GuoUniversity of Science and Technology of China, Hefei 230026, ChinaA. GuptaUniversity of Jammu, Jammu 180001, IndiaS. K. GuptaUniversity of Jammu, Jammu 180001, IndiaW. GurynBrookhaven National Laboratory, Upton, New York 11973, USA
2014en
ABI
Abstract
Rapidity-odd directed flow (v1) measurements for charged pions, protons, and antiprotons near midrapidity (y=0) are reported in sNN=7.7, 11.5, 19.6, 27, 39, 62.4, and 200 GeV Au+Au collisions as recorded by the STAR detector at the Relativistic Heavy Ion Collider. At intermediate impact parameters, the proton and net-proton slope parameter dv1/dy|y=0 shows a minimum between 11.5 and 19.6 GeV. In addition, the net-proton dv1/dy|y=0 changes sign twice between 7.7 and 39 GeV. The proton and net-proton results qualitatively resemble predictions of a hydrodynamic model with a first-order phase transition from hadronic matter to deconfined matter, and differ from hadronic transport calculations.
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Cited by 30 references