Azimuthal Anisotropy of Heavy-Flavor Decay Electrons in p -Pb Collisions at sNN =5.02 TeV

(ALICE Collaboration)

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16 Citations (Scopus)


Angular correlations between heavy-flavor decay electrons and charged particles at midrapidity (|η|<0.8) are measured in p-Pb collisions at sNN=5.02 TeV. The analysis is carried out for the 0%-20% (high) and 60%-100% (low) multiplicity ranges. The jet contribution in the correlation distribution from high-multiplicity events is removed by subtracting the distribution from low-multiplicity events. An azimuthal modulation remains after removing the jet contribution, similar to previous observations in two-particle angular correlation measurements for light-flavor hadrons. A Fourier decomposition of the modulation results in a positive second-order coefficient (v2) for heavy-flavor decay electrons in the transverse momentum interval 1.5<pT<4 GeV/c in high-multiplicity events, with a significance larger than 5σ. The results are compared with those of charged particles at midrapidity and those of inclusive muons at forward rapidity. The v2 measurement of open heavy-flavor particles at midrapidity in small collision systems could provide crucial information to help interpret the anisotropies observed in such systems.

Original languageEnglish
Article number072301
JournalPhysical review letters
Issue number7
Publication statusPublished - 2019 Feb 22

Bibliographical note

Funding Information:
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: the A. I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation (ANSL) and the State Committee of Science and World Federation of Scientists (WFS), Armenia; the Austrian Academy of Sciences and Nationalstiftung für Forschung, Technologie und Entwicklung, Austria; the Ministry of Communications and High Technologies, National Nuclear Research Center, Azerbaijan; the 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; the Ministry of Science & Technology of China (MSTC), the National Natural Science Foundation of China (NSFC), and the Ministry of Education of China (MOEC), China; the Ministry of Science and Education, 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 the Danish National Research Foundation (DNRF), Denmark; the Helsinki Institute of Physics (HIP), Finland; the Commissariat à l’Energie Atomique (CEA), the Institut National de Physique Nucléaire et de Physique des Particules (IN2P3), and the Centre National de la Recherche Scientifique (CNRS), France; Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (BMBF) and GSI Helmholtzzentrum für Schwerionenforschung GmbH, Germany; the General Secretariat for Research and Technology, Ministry of Education, Research and Religions, Greece; the National Research, Development and Innovation Office, Hungary; the Department of Atomic Energy (DAE), Department of Science and Technology (DST), and the University Grants Commission, Government of India (UGC), and the Council of Scientific and Industrial Research (CSIR), India; the 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; the Institute for Innovative Science and Technology, the Nagasaki Institute of Applied Science (IIST), Japan Society for the Promotion of Science (JSPS) KAKENHI, and the 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; the Commission on Science and Technology for Sustainable Development in the South (COMSATS), Pakistan; Pontificia Universidad Católica del Perú, Peru; the Ministry of Science and Higher Education and National Science Centre, Poland; Korea Institute of Science and Technology Information and the National Research Foundation of Korea (NRF), Republic of Korea; the Ministry of Education and Scientific Research, Institute of Atomic Physics, and the Romanian National Agency for Science, Technology and Innovation, Romania; the Joint Institute for Nuclear Research (JINR), the Ministry of Education and Science of the Russian Federation, and the National Research Centre Kurchatov Institute, Russia; the Ministry of Education, Science, Research and Sport of the Slovak Republic, Slovakia; the National Research Foundation of South Africa, South Africa; Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Cubaenergía, Cuba and Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Spain; the Swedish Research Council (VR) and the Knut & Alice Wallenberg Foundation (KAW), Sweden; the European Organization for Nuclear Research, Switzerland; the National Science and Technology Development Agency (NSDTA), the Suranaree University of Technology (SUT), and the Office of the Higher Education Commission under NRU project of Thailand, Thailand; the Turkish Atomic Energy Agency (TAEK), Turkey; the National Academy of Sciences of Ukraine, Ukraine; the Science and Technology Facilities Council (STFC), United Kingdom; and the National Science Foundation of the United States of America (NSF) and the United States Department of Energy, Office of Nuclear Physics (DOE NP), United States of America.

Publisher Copyright:
© 2019 CERN, for the ALICE Collaboration.

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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