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Beam-energy dependence of the directed flow of protons, antiprotons, and pions in Au+Au collisions

. 2014 Apr 25 ; 112 (16) : 162301. [epub] 20140423

Status PubMed-not-MEDLINE Language English Country United States Media print-electronic

Document type Journal Article

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.

AGH University of Science and Technology Cracow Poland

Alikhanov Institute for Theoretical and Experimental Physics Moscow Russia

Argonne National Laboratory Argonne Illinois 60439 USA

Brookhaven National Laboratory Upton New York 11973 USA

Central China Normal University Wuhan 430079 China

Cracow University of Technology Cracow Poland

Creighton University Omaha Nebraska 68178 USA

Czech Technical University Prague FNSPE Prague 115 19 Czech Republic

Frankfurt Institute for Advanced Studies FIAS Germany

Indian Institute of Technology Mumbai India

Indiana University Bloomington Indiana 47408 USA

Institute of High Energy Physics Protvino Russia

Institute of Modern Physics Lanzhou China

Institute of Nuclear Physics PAN Cracow Poland

Institute of Physics Bhubaneswar 751005 India

Joint Institute for Nuclear Research Dubna 141 980 Russia

Kent State University Kent Ohio 44242 USA

Korea Institute of Science and Technology Information Daejeon Korea

Lawrence Berkeley National Laboratory Berkeley California 94720 USA

Massachusetts Institute of Technology Cambridge Massachusetts 02139 4307 USA

Max Planck Institut für Physik Munich Germany

Michigan State University East Lansing Michigan 48824 USA

Moscow Engineering Physics Institute Moscow Russia

National Institute of Science Education and Research Bhubaneswar 751005 India

Nuclear Physics Institute AS CR 250 68 Řež Prague Czech Republic

Ohio State University Columbus Ohio 43210 USA

Old Dominion University Norfolk Virginia 23529 USA

Panjab University Chandigarh 160014 India

Pennsylvania State University University Park Pennsylvania 16802 USA

Purdue University West Lafayette Indiana 47907 USA

Pusan National University Pusan Republic of Korea

Rice University Houston Texas 77251 USA

Shandong University Jinan Shandong 250100 China

Shanghai Institute of Applied Physics Shanghai 201800 China

SUBATECH Nantes France

Temple University Philadelphia Pennsylvania 19122 USA

Texas A and M University College Station Texas 77843 USA

Tsinghua University Beijing 100084 China

United States Naval Academy Annapolis Maryland 21402 USA

Universidade Estadual de Campinas Sao Paulo Brazil

University of Birmingham Birmingham United Kingdom

University of California Berkeley California 94720 USA

University of California Davis California 95616 USA

University of California Los Angeles California 90095 USA

University of Houston Houston Texas 77204 USA

University of Illinois at Chicago Chicago Illinois 60607 USA

University of Jammu Jammu 180001 India

University of Kentucky Lexington Kentucky 40506 0055 USA

University of Rajasthan Jaipur 302004 India

University of Science and Technology of China Hefei 230026 China

University of Texas Austin Texas 78712 USA

University of Washington Seattle Washington 98195 USA

University of Zagreb Zagreb HR 10002 Croatia

Valparaiso University Valparaiso Indiana 46383 USA

Variable Energy Cyclotron Centre Kolkata 700064 India

Warsaw University of Technology Warsaw Poland

Wayne State University Detroit Michigan 48201 USA

Yale University New Haven Connecticut 06520 USA

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