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Dielectron production in Au plus Au collisions at root s(NN)=200 GeV

Adare, A (author)
University of Colorado
Aidala, C. (author)
University of Michigan,Los Alamos National Laboratory
Ajitanand, N N (author)
Stony Brook University
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Akiba, Y. (author)
Riken BNL Research Center,RIKEN Nishina Center for Accelerator-Based Science
Akimoto, R. (author)
University of Tokyo
Alexander, J J (author)
Stony Brook University
Alfred, M. (author)
Howard University
Al-Ta'ani, H. (author)
New Mexico State University
Angerami, A (author)
Columbia University
Aoki, K. (author)
RIKEN Nishina Center for Accelerator-Based Science,High Energy Accelerator Research Organization, Tsukuba
Apadula, N. (author)
Iowa State University,Stony Brook University
Aramaki, Y (author)
University of Tokyo,RIKEN Nishina Center for Accelerator-Based Science
Asano, H. (author)
Russian Research Center 'Kurchatov Institute',RIKEN Nishina Center for Accelerator-Based Science
Aschenauer, E. C. (author)
Brookhaven National Laboratory
Atomssa, E T (author)
Stony Brook University
Averbeck, R (author)
Stony Brook University
Awes, T. C. (author)
Oak Ridge National Laboratory
Azmoun, B (author)
Brookhaven National Laboratory
Babintsev, V. (author)
Institute for High Energy Physics, Russia
Bai, M. (author)
Brookhaven National Laboratory
Bandara, N. S. (author)
University of Massachusetts
Bannier, B. (author)
Stony Brook University
Barish, K N (author)
University of California, Riverside
Bassalleck, B. (author)
University of New Mexico
Bathe, S (author)
Baruch College,Riken BNL Research Center
Baublis, V. (author)
Petersburg Nuclear Physics Institute (PNPI)
Baumgart, S. (author)
RIKEN Nishina Center for Accelerator-Based Science
Bazilevsky, A. (author)
Brookhaven National Laboratory
Beaumier, M. (author)
University of California, Riverside
Beckman, S. (author)
University of Colorado
Belmont, R (author)
Vanderbilt University,University of Michigan,University of Colorado
Berdnikov, A (author)
St. Petersburg State Polytechnical University
Berdnikov, Y. (author)
St. Petersburg State Polytechnical University
Blau, D. S. (author)
Károly Róberts University College
Bok, J S (author)
Yonsei University,University of New Mexico,New Mexico State University
Boyle, K (author)
Riken BNL Research Center
Brooks, M L (author)
Los Alamos National Laboratory
Bryslawskyj, J. (author)
Baruch College
Buesching, H. (author)
Brookhaven National Laboratory
Bumazhnov, V. (author)
Institute for High Energy Physics, Russia
Butsyk, S. (author)
University of New Mexico
Campbell, S (author)
Columbia University,Iowa State University,Stony Brook University
Castera, P. (author)
Stony Brook University
Christiansen, P. (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Gustafsson, H. (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Haslum, E. (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Oskarsson, A. (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Silvermyr, D. (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Stenlund, E. (author)
Lund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Velkovska, J. (author)
Center for Integrated Research in Fundamental Science and Engineering,University of Tsukuba
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 (creator_code:org_t)
 
2016
2016
English.
In: Physical Review C (Nuclear Physics). - 0556-2813. ; 93:1
Related links:
http://dx.doi.org/10...
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https://lup.lub.lu.s...
https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We present measurements of e+e- production at midrapidity in Au+Au collisions at sNN=200 GeV. The invariant yield is studied within the PHENIX detector acceptance over a wide range of mass (mee<5 GeV/c2) and pair transverse momentum (pT<5 GeV/c) for minimum bias and for five centrality classes. The e+e- yield is compared to the expectations from known sources. In the low-mass region (mee=0.30-0.76 GeV/c2) there is an enhancement that increases with centrality and is distributed over the entire pair pT range measured. It is significantly smaller than previously reported by the PHENIX experiment and amounts to 2.3±0.4(stat)±0.4(syst)±0.2(model) or to 1.7±0.3(stat)±0.3(syst)±0.2(model) for minimum bias collisions when the open heavy-flavor contribution is calculated with pythia or mc@nlo, respectively. The inclusive mass and pT distributions, as well as the centrality dependence, are well reproduced by model calculations where the enhancement mainly originates from the melting of the ρ meson resonance as the system approaches chiral symmetry restoration. In the intermediate-mass region (mee=1.2-2.8 GeV/c2), the data hint at a significant contribution in addition to the yield from the semileptonic decays of heavy-flavor mesons.

Subject headings

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

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