Direct virtual photon production in Au+Au collisions at sNN=200 GeV

STAR Collaboration

doi:10.1016/j.physletb.2017.04.050

Direct virtual photon production in Au+Au collisions at s_NN=200 GeV

STAR Collaboration

AGH University of Krakow
University of Kentucky
Joint Institute for Nuclear Research
Panjab University
Kent State University
Brookhaven National Laboratory
Variable Energy Cyclotron Centre
Stony Brook University
Alikhanov Institute for Theoretical and Experimental Physics
Moscow Engineering Physics Institute
Texas A&M University
University of Tsukuba
Tsinghua University
Central China Normal University
National Institute of Science Education and Research
University of Houston
University of Jammu
University of Texas at Austin
Czech Technical University in Prague
Czech Academy of Sciences
Rice University
Lehigh University
Yale University
University of California at Davis
Ohio State University
University of Science and Technology of China
Chinese Academy of Sciences
Creighton University
Lawrence Berkeley National Laboratory
University of California at Berkeley
Shandong University
Institute for High Energy Physics
Pennsylvania State University
Lamar University
University of California at Los Angeles
Wayne State University
University of Illinois at Chicago
Southern Connecticut State University
Purdue University
Valparaiso University
Warsaw University of Technology
Temple University
National Cheng Kung University
Indiana University Bloomington
Goethe University Frankfurt
Argonne National Laboratory
Institute of Physics
Pusan National University
Institute of Nuclear Physics PAN
Max Planck Institute for Physics (Werner Heisenberg Institute)
Michigan State University
World Laboratory for Cosmology and Particle Physics (WLCAPP)
United States Naval Academy

Research output: Contribution to journal › Article › peer-review

60 Scopus citations

Abstract

We report the direct virtual photon invariant yields in the transverse momentum ranges 1<p_T<3 GeV/c and 5<p_T<10 GeV/c at mid-rapidity derived from the dielectron invariant mass continuum region 0.10<M_ee<0.28 GeV/c² for 0–80% minimum-bias Au+Au collisions at s_NN=200 GeV. A clear excess in the invariant yield compared to the nuclear overlap function T_AA scaled p+p reference is observed in the p_T range 1<p_T<3 GeV/c. For p_T>6 GeV/c the production follows T_AA scaling. Model calculations with contributions from thermal radiation and initial hard parton scattering are consistent within uncertainties with the direct virtual photon invariant yield.

Original language	English
Pages (from-to)	451-458
Number of pages	8
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	770
DOIs	https://doi.org/10.1016/j.physletb.2017.04.050
State	Published - 10 Jul 2017
Externally published	Yes

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10.1016/j.physletb.2017.04.050

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@article{293930aea2094df2bcad787e8968fa15,

title = "Direct virtual photon production in Au+Au collisions at sNN=200 GeV",

abstract = "We report the direct virtual photon invariant yields in the transverse momentum ranges 1T<3 GeV/c and 5T<10 GeV/c at mid-rapidity derived from the dielectron invariant mass continuum region 0.10ee<0.28 GeV/c2 for 0–80\% minimum-bias Au+Au collisions at sNN=200 GeV. A clear excess in the invariant yield compared to the nuclear overlap function TAA scaled p+p reference is observed in the pT range 1T<3 GeV/c. For pT>6 GeV/c the production follows TAA scaling. Model calculations with contributions from thermal radiation and initial hard parton scattering are consistent within uncertainties with the direct virtual photon invariant yield.",

author = "L. Adamczyk and Adkins, \{J. K.\} and G. Agakishiev and Aggarwal, \{M. M.\} and S. Kabana and \{STAR Collaboration\}",

note = "Publisher Copyright: {\textcopyright} 2017 The Author",

year = "2017",

month = jul,

day = "10",

doi = "10.1016/j.physletb.2017.04.050",

language = "English",

volume = "770",

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journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

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TY - JOUR

T1 - Direct virtual photon production in Au+Au collisions at sNN=200 GeV

AU - Adamczyk, L.

AU - Adkins, J. K.

AU - Agakishiev, G.

AU - Aggarwal, M. M.

AU - Kabana, S.

AU - STAR Collaboration

PY - 2017/7/10

Y1 - 2017/7/10

N2 - We report the direct virtual photon invariant yields in the transverse momentum ranges 1T<3 GeV/c and 5T<10 GeV/c at mid-rapidity derived from the dielectron invariant mass continuum region 0.10ee<0.28 GeV/c2 for 0–80% minimum-bias Au+Au collisions at sNN=200 GeV. A clear excess in the invariant yield compared to the nuclear overlap function TAA scaled p+p reference is observed in the pT range 1T<3 GeV/c. For pT>6 GeV/c the production follows TAA scaling. Model calculations with contributions from thermal radiation and initial hard parton scattering are consistent within uncertainties with the direct virtual photon invariant yield.

AB - We report the direct virtual photon invariant yields in the transverse momentum ranges 1T<3 GeV/c and 5T<10 GeV/c at mid-rapidity derived from the dielectron invariant mass continuum region 0.10ee<0.28 GeV/c2 for 0–80% minimum-bias Au+Au collisions at sNN=200 GeV. A clear excess in the invariant yield compared to the nuclear overlap function TAA scaled p+p reference is observed in the pT range 1T<3 GeV/c. For pT>6 GeV/c the production follows TAA scaling. Model calculations with contributions from thermal radiation and initial hard parton scattering are consistent within uncertainties with the direct virtual photon invariant yield.

UR - https://www.scopus.com/pages/publications/85019187716

U2 - 10.1016/j.physletb.2017.04.050

DO - 10.1016/j.physletb.2017.04.050

M3 - Article

AN - SCOPUS:85019187716

SN - 0370-2693

VL - 770

SP - 451

EP - 458

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Direct virtual photon production in Au+Au collisions at s_NN=200 GeV

Abstract

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