Low- pT e+e- Pair Production in Au +Au Collisions at sNN =200 GeV and U + U Collisions at sNN =193 GeV at STAR

STAR Collaboration

doi:10.1103/PhysRevLett.121.132301

Low- pT e+e- Pair Production in Au +Au Collisions at sNN =200 GeV and U + U Collisions at sNN =193 GeV at STAR

STAR Collaboration

Creighton University
AGH University of Krakow
Ohio State University
University of Kentucky
Kent State University
Joint Institute for Nuclear Research
Panjab University
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
Brookhaven National Laboratory
Tsinghua University
Central China Normal University
National Institute of Science Education and Research
University of California at Riverside
University of Houston
University of Jammu
Czech Technical University in Prague
Czech Academy of Sciences
Rice University
Lehigh University
Yale University
University of California at Davis
Shandong University
National Cheng Kung University
Chinese Academy of Sciences
University of Science and Technology of China
CAS - Institute of Modern Physics
Lawrence Berkeley National Laboratory
University of California at Berkeley
Heidelberg University
Institute for High Energy Physics
Pennsylvania State University
Lamar University
Wayne State University
University of California at Los Angeles
University of Illinois at Chicago
Southern Connecticut State University
Technische Universität Darmstadt
Valparaiso University
Temple University
Purdue University
Indiana University Bloomington
University of Texas at Austin
Warsaw University of Technology
Goethe University Frankfurt
Argonne National Laboratory
Fudan University
Rutgers - The State University of New Jersey, New Brunswick
Institute of Physics Bhubaneswar
Pusan National University
Institute of Nuclear Physics PAN
Max Planck Institute for Physics (Werner Heisenberg Institute)
Universidade de São Paulo
Michigan State University
United States Naval Academy

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110 Citas (Scopus)

Resumen

We report first measurements of e+e- pair production in the mass region 0.4<Mee<2.6 GeV/c2 at low transverse momentum (pT<0.15 GeV/c) in noncentral Au+Au collisions at sNN=200 GeV and U+U collisions at sNN=193 GeV. Significant enhancement factors, expressed as ratios of data over known hadronic contributions, are observed in the 40%-80% centrality of these collisions.

Idioma original	Inglés
Número de artículo	132301
Publicación	Physical Review Letters
Volumen	121
N.º	13
DOI	https://doi.org/10.1103/PhysRevLett.121.132301
Estado	Publicada - 25 sept 2018
Publicado de forma externa	Sí

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abstract = "We report first measurements of e+e- pair production in the mass region 0.4",

author = "J. Adam and L. Adamczyk and Adams, \{J. R.\} and Adkins, \{J. K.\} and S. Kabana and \{STAR Collaboration\}",

note = "Publisher Copyright: {\textcopyright}) between 40 and 60 MeV/c. The absolute cross section of the excess depends weakly on centrality, while those from a theoretical model calculation incorporating an in-medium broadened ρ spectral function and radiation from a quark gluon plasma or hadronic cocktail contributions increase dramatically with an increasing number of participant nucleons. Model calculations of photon-photon interactions generated by the initial projectile and target nuclei describe the observed excess yields but fail to reproduce the pT2 distributions. {\textcopyright} 2018 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the »https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP.",

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AU - Adkins, J. K.

AU - Kabana, S.

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N1 - Publisher Copyright: ©) between 40 and 60 MeV/c. The absolute cross section of the excess depends weakly on centrality, while those from a theoretical model calculation incorporating an in-medium broadened ρ spectral function and radiation from a quark gluon plasma or hadronic cocktail contributions increase dramatically with an increasing number of participant nucleons. Model calculations of photon-photon interactions generated by the initial projectile and target nuclei describe the observed excess yields but fail to reproduce the pT2 distributions. © 2018 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the »https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP.

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Low- pT e+e- Pair Production in Au +Au Collisions at sNN =200 GeV and U + U Collisions at sNN =193 GeV at STAR

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