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Angular Power Spectrum in Heavy Ion Collisions from Simulations

ORAL

Abstract

The pixelization code HEALPix was created by the Jet Propulsion Laboratory to analyze the cosmic microwave background. As has been shown using public data from the ALICE experiment, its two-dimensional representation of a sphere containing pixels of equal area has a broader application to heavy ion collisions. The application of HEALPix includes the concept of the angular power spectrum which details the contribution of spherical harmonics to the distribution of particles over the detector. This angular power spectrum can be directly related to the density and distribution of particles, which in turn relates to the particle flow. Through the use of simulated heavy ion data, we explore different aspects of the angular power spectrum and how it relates to flow analysis. There are some important details not covered within this study, such as the influence of non-flow. Therefore, the influence of non-flow is discussed in relation to the flow analysis. The angular power spectrum and features within the odd modes are detailed along with their specific application in heavy ion collisions. Through this study, it has become clear that HEALPix is another viable tool to be used in heavy ion flow analysis.

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Authors

  • Hannah Anderson

    Vanderbilt University

  • Gojko Vujanovic

    Lawrence Livermore National Laboratory, Los Alamos National Laboratory, Duke University, Duke University/TUNL, LANL, LLNL, Los Alamos Natl Lab, Pacific Northwest Natl Lab, Oregon State University, Lawrence Livermore Natl Lab, TUNL, Duke University, University of Kentucky, Brown University, Valparaiso University, North Carolina State University, Drake University, Univ of Idaho, Ohio University, Argonne National Laboratory, Lawrence Berkeley National Laboratory, NSCL, UMass Lowell, Tata Institute of Fundamental Research, India, UGC-DAE Consortium for Scientific Research, India, University of Maryland, College Park, University of North Carolina Chapel Hill, United States Naval Academy, Brookhaven National Laboratory, ELI-NP, Massachusetts Institute of Technology, James Madison University, Washington University, St. Louis, The University of North Carolina at Chapel Hill and Triangle Universities Nuclear Laboratory, Duke University and Triangle Universities Nuclear Laboratory, University of Warsaw, Louisiana State University, Oak Ridge National Laboratory, Tennessee Technological University, University of Tennessee, FSU, RBI, MSU, University of South Dakota, University of Pennsylvania, National Astronomical Observatory of Japan, Beihang University, University of Wisconsin, Department of Physics and Astronomy and Institute of Nuclear and Particle Physics, Ohio University, Department of Physics, The Ohio State University, Mississippi State Univ, University of Notre Dame, Columbia University, Michigan State University, Facility for Rare Isotope Beans, National Superconducting Cyclotron Laboratory, Tennessee Technological University, USA, Kyushu University, Riken Nishina Center, Japan, University of Warsaw, Poland, ORNL, University of Tennessee, Knoxville, RIKEN Nishina Center, Instituto de Fisica Corpuscular, Valencia, TRIUMF, University of Surrey, Oak Ridge National Lab, University of Tennessee Knoxville, Yale University, Old Dominion Univ/Jefferson Lab, Jefferson Lab, Univ of Virginia, Rutgers University, Texas A&M Cyclotron Institute & Department of Chemistry, Texas A&M Cyclotron Institute, Nuclear Engineering and Science Center, Texas A&M University, University of Alabama at Birmingham, Texas A&M University, Univ of Kentucky, University of Tel Aviv, North Carolina State University, TUNL, European X-ray Free Electron Laser, U. of Victoria, U. of British Columbia, McMaster U., North Island Coll., Colorado Sch. of Mines, Ohio U., Florida State University, INFN Pisa, Penn State University, Perugia University and INFN Perugia, Petersburg Nuclear Physics Institute, Davidson College, Hamton University, University of California, Davis, Lawrence Berkeley National Laboratory, Berkeley, University of California, Berkeley, University of Massachusetts, Amherst, Caltech, Northwestern University, Soreq NRC, Israel, Argonne National Laboratory, University of Chicago, University of Manitoba, McGill University, Johannes Gutenberg University, Colorado School of Mines, Soreq NRC, University of Chicago, ASRC, JAEA, NSCL, MSU, Hebrew University of Jerusalem, Ruder Boskovic Institute, National Superconducting Cyclotron Laboratory, MSU, Indiana University South Bend, University of Bielefeld, Bielefeld, 33615 Germany, Universidade Estadual de Campinas, Universidade Federal de Santa Catarina, Department of Physics, University of Illinois at Urbana-Champaign, Universidade de Sao Paulo, Stony Brook University, University of São Paulo, Central China Normal University, IKP, TU Darmstadt, Physics Division, ORNL, ITP II, Universität Erlangen-Nürnberg, NSCL/Dept. of Physics and Astronomy, MSU, NSCL/Dept. of Chemistry, MSU, FRIB/Dept. of Physics and Astronomy, MSU, FRIB/Dept. of Chemistry, MSU, FRIB, MSU, Dept. of Chemistry, Augustana University, Dept. of Physics, University of Jyvaeskylae, Max Planck Institut für Physik, Institute for Nuclear Theory, University of Washington, Joint Quantum Institute, Department of Physics,University of Maryland, College Park, MD 20742, USA, Maryland Center for Fundamental Physics and Department of Physics, University of Maryland, College Park, MD 20742, USA, Maryland Center for Fundamental Physics and Department of Physics,University of Maryland, College Park, MD 20742, USA, CEA,DAM,DIF, U. Manitoba, Texas A \& M, U. British Columbia, Soreq NRC, Yavne 81800, Israel, University of Chicago, Argonne National Laboratory, Department of Physics and Astronomy, Iowa State University, Institute of Modern Physics, Chinese Academy of Sciences, Texas A&M University Cyclotron Institute, Charles University, Moravian College Physics and Earth Science Department, TRIUMF/University of Victoria, JLU Giessen/GSI, TRIUMF/UBC, JLU Giessen, TRIUMF/University of York, ELI, Romania, Notre Dame, Oak Ridge, Ioffe Institute, JINA-CEE, Maryland, Coastal Carolina, Sao Paulo, Indiana, Michigan State, Mississippi State, IIT Ropar, HKU Space, South Dakota School of Mines and Technology, South Dakota School of Mines & Technology, Kent State Univ - Kent, University of Colorado, Boulder, Pusan National University, University of Illinois at Urbana-Champaign, Lebanon Valley College, Institut fur Kernphysik der Universitat zu Koln, University of York, Michigan State Univiversity/NSCL, Ins. Kernphyik, TUD, Phys. Div., ORNL, NSCL/Dep. Chem., MSU, Dep. Chem., Augustana Univ., Dep. Phys., Florida State Univ., NSCL/Dep. Phys. Astron., MSU, NSCL, Michigan State Univ., Florida State Univ., RCNP, Osaka Univ., LSU, ANL, U.Chicago, ANL, Mississippi State University, Central Michigan University, National Superconducting Cyclotron Laboratory, Michigan State University, Western Michigan University, University of Washington, Southern Methodist University, MIT, Max-Planck-Institut f{\"u}r Kernphysik, Heidelberg, U of South Carolina, University of Washington, Pacific Northwest National Lab, University of British Columbia, none, Cyclotron Institute, Texas A&M University, Vanderbilt University, The Australian National University, Cyclotron Institute, Texas A\&M University, College Station, TX 77843, BNL, NSCL/MSU, U. of Rochester, UNC Chapel Hill, CIAE, China, Florida State University, Tallahassee, Louisiana State University, Baton Rouge, Facility for Rare Isotope Beams, Michigan State University, Nuclear Physics Institute, Czech Republic, Academy of Sciences of the Czech Republic, Florida State Univ, Wabash College, Gonzaga University, Old Dominion University, Michigan State University, National Superconducting Cyclotron Laboratory, Facility for Rare Isotope Beams, Michigan State University, National Superconducting Cyclotron Laboratory, Lebanon Valley Coll, Penn State Berks, Temple University, National Taiwan University, Indiana University, Jefferson Lab & Indiana University, ECT* & FBK, Trento, Department of Physics and Astronomy, Ghent University, Universidad Complutense de Madrid, Jefferson Lab & Old Dominion University, Institut für Kernphysik & PRISMA Cluster of Excellence, Johannes Gutenberg Universität, Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Saint Mary's University, Saint Mary's University + TRIUMF, Augustana College, Cyclotron Institute, Texas A&M, Univ of Illinois - Chicago, State Univ of NY - Stony Brook, Univ. of Chicago, Univ. of Manitoba, LBNL, UC Irvine, UC Berkeley, TAMU, Univ. of Notre Dame, Univ. North Carolina, UC- Berkeley, Miss. State Univ., University of Notre Dame & Londrina State University, University of Michigan, Universidade Estadual Paulista, Rice University, Thomas Jefferson National Accelerator Facility, Illinois Institute of Technology, University of Glasgow, University of Virginia, Cornell University, IFIN-HH, University of Manitoba, Winnipeg, McGill University, Montreal, Uni of Tennessee, Uni of Edinburgh, IFIC, Spain, UPC, Spain, RIKEN, NPL, UK, Uni of Hong Kong, MTA Atomki, Central Michigan Uni, Facility for Rare Isotope Beams, TU Darmstadt, Pacific Northwest National Laboratory, Natl Superconducting Cyclotron Lab, Texas A$\&$M University Cylcotron Inst, Oak Ridge Natl Lab, Northwestern Polytechnical University, Georgia State University, National Superconducting Cyclotron Laboratory, MSU, East Lansing, MI 48824, USA, Department of Chemistry, Augustana University, Sioux Falls, SD 57197, USA, Iowa State University, U. of North Carolina at Chapel Hill, NVIDIA Corp., William \& Mary, U. of California at Berkeley, U. of Maryland, Boston University, Michigan State Univ, Beijing Normal U., Taiwan, Natl. Taiwan U., CERN, Old Dominion University and Jefferson Lab, INFN, Hampton University, JLab, FIU, Tohoku University, Tohoku Univ., Tokyo Tech, University of Illinois Urbana-Champaign, UFNR, Univ of Houston, Wayne State University