Observation of Charge Asymmetry Dependence of Pion Elliptic Flow and the Possible Chiral Magnetic Wave in Heavy-Ion Collisions

. 2015 Jun 26 ; 114 (25) : 252302. [epub] 20150626

Status PubMed-not-MEDLINE Jazyk angličtina Země Spojené státy americké Médium print-electronic

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/pmid26197122

We present measurements of π(-) and π(+) elliptic flow, v(2), at midrapidity in Au+Au collisions at √[s(NN)]=200, 62.4, 39, 27, 19.6, 11.5, and 7.7 GeV, as a function of event-by-event charge asymmetry, A(ch), based on data from the STAR experiment at RHIC. We find that π(-) (π(+)) elliptic flow linearly increases (decreases) with charge asymmetry for most centrality bins at √[s(NN)]=27 GeV and higher. At √[s(NN)]=200 GeV, the slope of the difference of v(2) between π(-) and π(+) as a function of A(ch) exhibits a centrality dependence, which is qualitatively similar to calculations that incorporate a chiral magnetic wave effect. Similar centrality dependence is also observed at lower energies.

AGH University of Science and Technology Cracow 30 059 Poland

Alikhanov Institute for Theoretical and Experimental Physics Moscow 117218 Russia

Argonne National Laboratory Argonne Illinois 60439 USA

Brookhaven National Laboratory Upton New York 11973 USA

Central China Normal University Wuhan 430079 China

Creighton University Omaha Nebraska 68178 USA

Czech Technical University Prague FNSPE Prague 115 19 Czech Republic

Frankfurt Institute for Advanced Studies FIAS Frankfurt 60438 Germany

Indian Institute of Technology Mumbai 400076 India

Indiana University Bloomington Indiana 47408 USA

Institute of High Energy Physics Protvino 142281 Russia

Institute of Modern Physics Lanzhou 730000 China

Institute of Nuclear Physics PAN Cracow 31 342 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 305 701 Korea

Lawrence Berkeley National Laboratory Berkeley California 94720 USA

Max Planck Institut fur Physik Munich 80805 Germany

Michigan State University East Lansing Michigan 48824 USA

Moscow Engineering Physics Institute Moscow 115409 Russia

National Institute of Science Education and Research Bhubaneswar 751005 India

Nuclear Physics Institute AS CR 250 68 Řež Prague Czech Republic

Panjab University Chandigarh 160014 India

Pennsylvania State University University Park Pennsylvania 16802 USA

Purdue University West Lafayette Indiana 47907 USA

Pusan National University Pusan 609735 Republic of Korea

Rice University Houston Texas 77251 USA

Shandong University Jinan Shandong 250100 China

Shanghai Institute of Applied Physics Shanghai 201800 China

Temple University Philadelphia Pennsylvania 19122 USA

Texas A and M University College Station Texas 77843 USA

The Ohio State University Columbus Ohio 43210 USA

Tsinghua University Beijing 100084 China

United States Naval Academy Annapolis Maryland 21402 USA

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 Zagreb Zagreb HR 10002 Croatia

Valparaiso University Valparaiso Indiana 46383 USA

Variable Energy Cyclotron Centre Kolkata 700064 India

Warsaw University of Technology Warsaw 00 661 Poland

Wayne State University Detroit Michigan 48201 USA

World Laboratory for Cosmology and Particle Physics Cairo 11571 Egypt

Yale University New Haven Connecticut 06520 USA

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