Abstract
In ultrarelativistic heavy-ion collisions, the event-by-event variation of the elliptic flow v2 reflects fluctuations in the shape of the initial state of the system. This allows to select events with the same centrality but different initial geometry. This selection technique, Event Shape Engineering, has been used in the analysis of charge-dependent two- and three-particle correlations in Pb–Pb collisions at sNN=2.76 TeV. The two-particle correlator 〈cos(φα−φβ)〉 calculated for different combinations of charges α and β is almost independent of v2 (for a given centrality), while the three-particle correlator 〈cos(φα+φβ−2Ψ2)〉 scales almost linearly both with the event v2 and charged-particle pseudorapidity density. The charge dependence of the three-particle correlator is often interpreted as evidence for the Chiral Magnetic Effect (CME), a parity violating effect of the strong interaction. However, its measured dependence on v2 points to a large non-CME contribution to the correlator. Comparing the results with Monte Carlo calculations including a magnetic field due to the spectators, the upper limit of the CME signal contribution to the three-particle correlator in the 10–50% centrality interval is found to be 26–33% at 95% confidence level.
| Original language | English |
|---|---|
| Pages (from-to) | 151-162 |
| Number of pages | 12 |
| Journal | Physics Letters B |
| Volume | 777 |
| DOIs | |
| State | Published - Feb 10 2018 |
Bibliographical note
Publisher Copyright:© 2017 The Author(s)
Funding
The ALICE Collaboration would like to thank all its engineers and technicians for their invaluable contributions to the construction of the experiment and the CERN accelerator teams for the outstanding performance of the LHC complex. The ALICE Collaboration gratefully acknowledges the resources and support provided by all Grid centres and the Worldwide LHC Computing Grid (WLCG) collaboration. The ALICE Collaboration acknowledges the following funding agencies for their support in building and running the ALICE detector: A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation (ANSL), State Committee of Science and World Federation of Scientists (WFS), Armenia; Austrian Academy of Sciences and Nationalstiftung für Forschung, Technologie und Entwicklung , Austria; Ministry of Communications and High Technologies , National Nuclear Research Center , Azerbaijan; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Universidade Federal do Rio Grande do Sul (UFRGS), Financiadora de Estudos e Projetos (Finep) and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), Brazil; Ministry of Science & Technology of China (MSTC), National Natural Science Foundation of China (NSFC) and Ministry of Education of China (MOEC), China; Ministry of Science, Education and Sport and Croatian Science Foundation , Croatia; Ministry of Education, Youth and Sports of the Czech Republic, Czech Republic; The Danish Council for Independent Research – Natural Sciences, the Carlsberg Foundation and Danish National Research Foundation (DNRF), Denmark; Helsinki Institute of Physics (HIP), Finland; Commissariat à l'Energie Atomique (CEA) and Institut National de Physique Nucléaire et de Physique des Particules (IN2P3) and Centre National de la Recherche Scientifique (CNRS), France; Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie ( BMBF ) and GSI Helmholtzzentrum für Schwerionenforschung GmbH , Germany; General Secretariat for Research and Technology , Ministry of Education, Research and Religions , Greece; National Research, Development and Innovation Office , Hungary; Department of Atomic Energy, Government of India (DAE) and Council of Scientific and Industrial Research (CSIR), New Delhi, India; Indonesian Institute of Science , Indonesia; Centro Fermi – Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi and Istituto Nazionale di Fisica Nucleare ( INFN ), Italy; Institute for Innovative Science and Technology, Nagasaki Institute of Applied Science ( IIST ), Japan Society for the Promotion of Science (JSPS) KAKENHI and Japanese Ministry of Education, Culture, Sports, Science and Technology ( MEXT ), Japan; Consejo Nacional de Ciencia ( CONACYT ) y Tecnología, through Fondo de Cooperación Internacional en Ciencia y Tecnología ( FONCICYT ) and Dirección General de Asuntos del Personal Academico (DGAPA), Mexico; Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands; The Research Council of Norway , Norway; Commission on Science and Technology for Sustainable Development in the South (COMSATS), Pakistan; Pontificia Universidad Católica del Perú , Peru; Ministry of Science and Higher Education and National Science Centre, Poland ; Korea Institute of Science and Technology Information and National Research Foundation of Korea (NRF), Republic of Korea; Ministry of Education and Scientific Research , Institute of Atomic Physics and Romanian National Agency for Science, Technology and Innovation , Romania; Joint Institute for Nuclear Research (JINR), Ministry of Education and Science of the Russian Federation and National Research Centre Kurchatov Institute , Russia; Ministry of Education, Science, Research and Sport of the Slovak Republic , Slovakia; National Research Foundation of South Africa, South Africa; Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Cubaenergía , Cuba, Ministerio de Ciencia e Innovacion and Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas ( CIEMAT ), Spain; Swedish Research Council (VR) and Knut & Alice Wallenberg Foundation (KAW), Sweden; European Organization for Nuclear Research , Switzerland; National Science and Technology Development Agency (NSDTA), Suranaree University of Technology (SUT) and Office of the Higher Education Commission under NRU project of Thailand , Thailand; Turkish Atomic Energy Agency ( TAEK ), Turkey; National Academy of Sciences of Ukraine , Ukraine; Science and Technology Facilities Council (STFC), United Kingdom; National Science Foundation of the United States of America ( NSF ) and U.S. Department of Energy , Office of Nuclear Physics (DOE NP), United States of America. The ALICE Collaboration would like to thank all its engineers and technicians for their invaluable contributions to the construction of the experiment and the CERN accelerator teams for the outstanding performance of the LHC complex. The ALICE Collaboration gratefully acknowledges the resources and support provided by all Grid centres and the Worldwide LHC Computing Grid (WLCG) collaboration. The ALICE Collaboration acknowledges the following funding agencies for their support in building and running the ALICE detector: A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation (ANSL), State Committee of Science and World Federation of Scientists (WFS), Armenia; Austrian Academy of Sciences and Nationalstiftung für Forschung, Technologie und Entwicklung, Austria; Ministry of Communications and High Technologies, National Nuclear Research Center, Azerbaijan; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Universidade Federal do Rio Grande do Sul (UFRGS), Financiadora de Estudos e Projetos (Finep) and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), Brazil; Ministry of Science & Technology of China (MSTC), National Natural Science Foundation of China (NSFC) and Ministry of Education of China (MOEC), China; Ministry of Science, Education and Sport and Croatian Science Foundation, Croatia; Ministry of Education, Youth and Sports of the Czech Republic, Czech Republic; The Danish Council for Independent Research – Natural Sciences, the Carlsberg Foundation and Danish National Research Foundation (DNRF), Denmark; Helsinki Institute of Physics (HIP), Finland; Commissariat à l'Energie Atomique (CEA) and Institut National de Physique Nucléaire et de Physique des Particules (IN2P3) and Centre National de la Recherche Scientifique (CNRS), France; Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (BMBF) and GSI Helmholtzzentrum für Schwerionenforschung GmbH, Germany; General Secretariat for Research and Technology, Ministry of Education, Research and Religions, Greece; National Research, Development and Innovation Office, Hungary; Department of Atomic Energy, Government of India (DAE) and Council of Scientific and Industrial Research (CSIR), New Delhi, India; Indonesian Institute of Science, Indonesia; Centro Fermi – Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi and Istituto Nazionale di Fisica Nucleare (INFN), Italy; Institute for Innovative Science and Technology, Nagasaki Institute of Applied Science (IIST), Japan Society for the Promotion of Science (JSPS) KAKENHI and Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan; Consejo Nacional de Ciencia (CONACYT) y Tecnología, through Fondo de Cooperación Internacional en Ciencia y Tecnología (FONCICYT) and Dirección General de Asuntos del Personal Academico (DGAPA), Mexico; Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands; The Research Council of Norway, Norway; Commission on Science and Technology for Sustainable Development in the South (COMSATS), Pakistan; Pontificia Universidad Católica del Perú Peru; Ministry of Science and Higher Education and National Science Centre, Poland; Korea Institute of Science and Technology Information and National Research Foundation of Korea (NRF), Republic of Korea; Ministry of Education and Scientific Research, Institute of Atomic Physics and Romanian National Agency for Science, Technology and Innovation, Romania; Joint Institute for Nuclear Research (JINR), Ministry of Education and Science of the Russian Federation and National Research Centre Kurchatov Institute, Russia; Ministry of Education, Science, Research and Sport of the Slovak Republic, Slovakia; National Research Foundation of South Africa, South Africa; Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Cubaenergía, Cuba, Ministerio de Ciencia e Innovacion and Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Spain; Swedish Research Council (VR) and Knut & Alice Wallenberg Foundation (KAW), Sweden; European Organization for Nuclear Research, Switzerland; National Science and Technology Development Agency (NSDTA), Suranaree University of Technology (SUT) and Office of the Higher Education Commission under NRU project of Thailand, Thailand; Turkish Atomic Energy Agency (TAEK), Turkey; National Academy of Sciences of Ukraine, Ukraine; Science and Technology Facilities Council (STFC), United Kingdom; National Science Foundation of the United States of America (NSF) and U.S. Department of Energy, Office of Nuclear Physics (DOE NP), United States of America.
| Funders | Funder number |
|---|---|
| Austrian Academy of Sciences and Nationalstiftung für Forschung, Technologie und Entwicklung | |
| Centro Fermi – Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi and Istituto Nazionale di Fisica Nucleare | |
| General Secretariat for Research and Technology , Ministry of Education, Research and Religions | |
| Helsinki Institute of Physics | |
| Indonesian Institute of Science , Indonesia | |
| Institute of Atomic Physics and Romanian National Agency for Science, Technology and Innovation , Romania | |
| Ministry of Communications and High Technologies | |
| Ministry of Education, Science, Research and Sport | |
| Ministry of Education, Youth and Sports of the Czech Republic, Czech Republic | |
| Ministry of Science, Education and Sport and Croatian Science Foundation | |
| NRU | |
| National Nuclear Research Center | |
| State Committee of Science and World Federation | |
| Turkish Atomic Energy Agency | |
| Yerevan Physics Institute | |
| U.S. Department of Energy | |
| Nuclear Physics | |
| Türkiye Atom Enerjisi Kurumu | |
| Ministry of Higher Education and Scientific Research | |
| Horizon 2020 Framework Programme | 665779 |
| Horizon 2020 Framework Programme | |
| CERN | |
| Office of the Higher Education Commission | |
| Institute for Innovative Science and Technology, Nagasaki Institute of Applied Science | |
| Science and Technology Facilities Council | |
| National Stroke Foundation | |
| National Research Foundation | |
| Council of Scientific and Industrial Research, India | |
| Department of Atomic Energy, Government of India | |
| Japan Society for the Promotion of Science | |
| Ministry of Education, Culture, Sports, Science and Technology | |
| Danmarks Grundforskningsfond | |
| Fundação de Amparo à Pesquisa do Estado de São Paulo | |
| National Natural Science Foundation of China | |
| Austrian Academy of Sciences | |
| Ministerstvo Školství, Mládeže a Tělovýchovy | |
| Ministry of Education of the People's Republic of China | |
| Bundesministerium für Bildung und Forschung | |
| Carlsbergfondet | |
| Ministry of Science and Technology of the People's Republic of China | |
| Consejo Nacional de Ciencia y Tecnología | |
| Ministerstvo školstva, vedy, výskumu a športu Slovenskej republiky | |
| Nederlandse Organisatie voor Wetenschappelijk Onderzoek | |
| Ministry of Education and Science of the Russian Federation | |
| General Secretariat for Research and Technology | |
| Conselho Nacional de Desenvolvimento Científico e Tecnológico | |
| Korea Institute of Science and Technology Information | |
| National Research Foundation of Korea | |
| Joint Institute for Nuclear Research | |
| Instituto Nazionale di Fisica Nucleare | |
| Knut och Alice Wallenbergs Stiftelse | |
| National Science and Technology Development Agency | |
| Narodowe Centrum Nauki | |
| Suranaree University of Technology | |
| Vetenskapsrådet | |
| Hrvatska Zaklada za Znanost | |
| Ministerstwo Edukacji i Nauki | |
| National Academy of Sciences of Ukraine | |
| Centre National de la Recherche Scientifique | |
| Financiadora de Estudos e Projetos | |
| Danmarks Frie Forskningsfond | |
| Ministerio de Ciencia e Innovación | |
| Universidade Federal do Rio Grande do Sul | |
| Norges Forskningsråd | |
| Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México | |
| Commissariat à l'Énergie Atomique et aux Énergies Alternatives | |
| Bundesministerium für Bildung und Frauen | |
| State Committee of Science | |
| Fondo de Cooperación Internacional en Ciencia y Tecnología | |
| Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas | |
| GSI Helmholtzzentrum für Schwerionenforschung | |
| Nemzeti Kutatási Fejlesztési és Innovációs Hivatal | |
| Institut National de Physique Nucléaire et de Physique des Particules | |
| National Research Center "Kurchatov Institute" | |
| Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear | |
| Indian Institute of Space Science and Technology |