Beam energy dependence of rapidity-even dipolar flow in Au+Au collisions
J. AdamCreighton University, Omaha, NE 68178L. AdamczykAGH University of Science and Technology, FPACS, Cracow 30-059, PolandJ. R. AdamsOhio State University, Columbus, OH 43210J. K. AdkinsUniversity of Kentucky, Lexington, KY 40506-0055G. AgakishievJoint Institute for Nuclear Research, Dubna, 141 980, RussiaM. M. AggarwalPanjab University, Chandigarh 160014, IndiaZ. AhammedVariable Energy Cyclotron Centre, Kolkata 700064, IndiaN. N. AjitanandState University of New York, Stony Brook, NY 11794I. AlekseevNational Research Nuclear University MEPhI, Moscow 115409, RussiaD. M. AndersonTexas A&M University, College Station, TX 77843Y. G.University of Tsukuba, Tsukuba, Ibaraki 305-8571, JapanA. AparinJoint Institute for Nuclear Research, Dubna, 141 980, RussiaD. ArkhipkinBrookhaven National Laboratory, Upton, NY 11973E. C. AschenauerBrookhaven National Laboratory, Upton, NY 11973M. U. AshrafTsinghua University, Beijing 100084F. AtetallaKent State University, Kent, OH 44242A. AttriPanjab University, Chandigarh 160014, IndiaG. S. AverichevJoint Institute for Nuclear Research, Dubna, 141 980, RussiaX. BaiCentral China Normal University, Wuhan, Hubei 430079V. BairathiNational Institute of Science Education and Research, HBNI, Jatni 752050, IndiaK. N. BarishBrookhaven National Laboratory, Upton, NY 11973A. J. BassillStony Brook UniversityA. BeheraStony Brook UniversityR. BellwiedNational Institute of Science Education and Research, HBNI, Jatni 752050, IndiaA. BhasinUniversity of Jammu, Jammu 180001, IndiaA. K. BhatiJoint Institute for Nuclear Research, Dubna, 141 980, RussiaJ. BielčíkStony Brook UniversityJ. BielčíkováState University of New York, Stony Brook, NY 11794L. C. BlandBrookhaven National Laboratory, Upton, NY 11973I. G. BordyuzhinAlikhanov Institute for Theoretical and Experimental Physics, Moscow 117218, RussiaJ. D. BrandenburgRice University, Houston, Texas 77251A. V. BrandinJoint Institute for Nuclear Research, Dubna, 141 980, RussiaD. S. BrownLehigh University, Bethlehem, PA 18015J. BryslawskyjStony Brook UniversityI. BunzarovNational Institute of Science Education and Research, HBNI, Jatni 752050, IndiaJ. M. ButterworthStony Brook UniversityH. CainesNational Institute of Science Education and Research, HBNI, Jatni 752050, IndiaM. Calderon De La Barca SanchezTsinghua University, Beijing 100084J. M. CampbellOhio State University, Columbus, Ohio 43210D. CebraUniversity of California, Davis, CA 95616I. ChakaberiaNational Institute of Science Education and Research, HBNI, Jatni 752050, IndiaP. ChaloupkaCzech Technical University in Prague, FNSPE, Prague, 115 19, Czech RepublicF-H. ChangNational Cheng Kung University, Tainan 70101Z. ChangBrookhaven National Laboratory, Upton, NY 11973N. Chankova-BunzarovaBrookhaven National Laboratory, Upton, NY 11973A. ChatterjeeVariable Energy Cyclotron Centre, Kolkata 700064, IndiaS. ChattopadhyayJoint Institute for Nuclear Research, Dubna, 141 980, RussiaJ.H. ChenBrookhaven National Laboratory, Upton, NY 11973X. ChenBrookhaven National Laboratory, Upton, NY 11973J. ChengState University of New York, Stony Brook, NY 11794M. CherneyTsinghua University, Beijing 100084W. ChristiePanjab University, Chandigarh 160014, IndiaG. ContinLawrence Berkeley National Laboratory, Berkeley, CA 94720H. J. CrawfordUniversity of California, Berkeley, CA 94720Santosh K. DasCentral China Normal University, Wuhan, Hubei 430079Т. Г. ДедовичJoint Institute for Nuclear Research, Dubna, 141 980, RussiaI. M. DeppnerUniversity of Heidelberg, Heidelberg, 69120, GermanyA. A. DerevschikovInstitute of High Energy Physics, Protvino 142281, RussiaL. DidenkoBrookhaven National Laboratory, Upton, NY 11973C. DilksPennsylvania State University, University Park, PA 16802X. DongCentral China Normal University, Wuhan, Hubei 430079J. L. DrachenbergNational Institute of Science Education and Research, HBNI, Jatni 752050, IndiaJ. C. DunlopUniversity of Illinois at Chicago, Chicago, Illinois 60607L. G. EfimovJoint Institute for Nuclear Research, Dubna, 141 980, RussiaN. ElseyBrookhaven National Laboratory, Upton, NY 11973J. EngelageState University of New York, Stony Brook, NY 11794G. EppleyJoint Institute for Nuclear Research, Dubna, 141 980, RussiaR. EshaNational Institute of Science Education and Research, HBNI, Jatni 752050, IndiaS. EsumiJoint Institute for Nuclear Research, Dubna, 141 980, RussiaO. EvdokimovUniversity of Tsukuba, Tsukuba, Ibaraki 305-8571, JapanJ. EwiglebenStony Brook UniversityO. EyserUniversity of Tsukuba, Tsukuba, Ibaraki 305-8571, JapanR. FatemiNational Institute of Science Education and Research, HBNI, Jatni 752050, IndiaS. FazioJoint Institute for Nuclear Research, Dubna, 141 980, RussiaP. FedericNuclear Physics Institute AS CR, Prague 250 68, Czech RepublicP. FederičováBrookhaven National Laboratory, Upton, NY 11973J. FedorišinStony Brook UniversityP. FilipBrookhaven National Laboratory, Upton, NY 11973E. FinchJoint Institute for Nuclear Research, Dubna, 141 980, RussiaY. FisyakUniversity of Tsukuba, Tsukuba, Ibaraki 305-8571, JapanC. E. FloresUniversity of Illinois at Chicago, Chicago, Illinois 60607Ł. FulekKent State University, Kent, OH 44242C. A. GagliardiBrookhaven National Laboratory, Upton, NY 11973T. GalatyukNational Institute of Science Education and Research, HBNI, Jatni 752050, IndiaF. J. M. GeurtsKent State University, Kent, OH 44242S. M. GibsonValparaiso University, Valparaiso, Indiana 46383D. GrosnickBrookhaven National Laboratory, Upton, NY 11973D. S. GunarathneTemple University, Philadelphia, Pennsylvania 19122Yi GuoUniversity of Tsukuba, Tsukuba, Ibaraki 305-8571, JapanA. GuptaUniversity of Jammu, Jammu 180001, IndiaW. GurynPanjab University, Chandigarh 160014, IndiaA. I. HamadKent State University, Kent, OH 44242A. HamedUniversity of California, Riverside, California 92521A. HarlenderovaArgonne National Laboratory, Argonne, Illinois 60439J. W. HarrisArgonne National Laboratory, Argonne, Illinois 60439L. HeJoint Institute for Nuclear Research, Dubna, 141 980, RussiaS. HeppelmannUniversity of California, Davis, CA 95616N. HerrmannUniversity of Heidelberg, Heidelberg, 69120, Germany
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New measurements of directed flow for charged hadrons, characterized by the Fourier coefficient v1, are presented for transverse momenta pT, and centrality intervals in Au+Au collisions recorded by the STAR experiment for the center-of-mass energy range sNN=7.7–200 GeV. The measurements underscore the importance of momentum conservation, and the characteristic dependencies on sNN, centrality and pT are consistent with the expectations of geometric fluctuations generated in the initial stages of the collision, acting in concert with a hydrodynamic-like expansion. The centrality and pT dependencies of v1even, as well as an observed similarity between its excitation function and that for v3, could serve as constraints for initial-state models. The v1even excitation function could also provide an important supplement to the flow measurements employed for precision extraction of the temperature dependence of the specific shear viscosity.
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