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Measurements of dielectron production in Au+Au collisions at sNN=27, 39, and 62.4 GeV from the STAR experiment

M. I. Abdulhamid4, B. E. Aboona55, J. Adam15, L. Adamczyk2, J. R. Adams39, I. Aggarwal41, M. M. Aggarwal41, Z. Ahammed62, D. M. Anderson55 et al. (STAR Collaboration)

D. M. Anderson55, E. C. Aschenauer6, S. Aslam26, J. Atchison1, V. Bairathi53, W. Baker11, J. G. Ball Cap22, K. Barish11, R. Bellwied22, P. Bhagat29, A. Bhasin29, S. Bhatta52, J. Bielcik15, J. Bielcikova38, J. D. Brandenburg39, J. Butterworth43, X. Z. Cai50, H. Caines65, M. Calderón de la Barca Sánchez9, D. Cebra9, J. Ceska15, I. Chakaberia32, P. Chaloupka15, B. K. Chan10, Z. Chang27, A. Chatterjee17, D. Chen11, J. Chen49, J. H. Chen20, Z. Chen49, J. Cheng57, Y. Cheng10, S. Choudhury20, W. Christie6, X. Chu6, H. J. Crawford8, M. Csanád18, G. Dale-Gau13, A. Das15, M. Daugherity1, I. M. Deppner21, A. Dhamija41, L. Di Carlo64, L. Didenko6, P. Dixit24, X. Dong32, J. L. Drachenberg1, E. Duckworth30, J. C. Dunlop6, J. Engelage8, G. Eppley43, S. Esumi58, O. Evdokimov13, A. Ewigleben33, O. Eyser6, R. Fatemi31, S. Fazio7, C. J. Feng37, Y. Feng42, E. Finch51, Y. Fisyak6, F. A. Flor65, C. Fu12, C. A. Gagliardi55, T. Galatyuk16, F. Geurts43, N. Ghimire54, A. Gibson61, K. Gopal25, X. Gou49, D. Grosnick61, Y. Guo30, A. Gupta29, W. Guryn6, A. Hamed4, Y. Han43, S. Harabasz16, M. D. Harasty9, J. W. Harris65, H. Harrison-Smith31, W. He20, X. H. He28, Y. He49, N. Herrmann21, L. Holub15, C. Hu28, Q. Hu28, Y. Hu32, B. Huang13, H. Huang37, H. Z. Huang10, S. L. Huang52, T. Huang13, X. Huang57, Y. Huang57, Y. Huang12, P. Huck32, T. J. Humanic39, D. Isenhower1, M. Isshiki58, W. W. Jacobs27, A. Jalotra29, C. Jena25, A. Jentsch6, Y. Ji32, J. Jia6,52, C. Jin43, X. Ju46, E. G. Judd8, S. Kabana53, M. L. Kabir11, S. Kagamaster33, D. Kalinkin31, K. Kang57, D. Kapukchyan11, K. Kauder6, H. W. Ke6, D. Keane30, M. Kelsey64, Y. V. Khyzhniak39, D. P. Kikoła63, B. Kimelman9, D. Kincses18, I. Kisel19, A. Kiselev6, A. G. Knospe33, H. S. Ko32, L. K. Kosarzewski15, L. Kramarik15, L. Kumar41, S. Kumar28, R. Kunnawalkam Elayavalli65, R. Lacey52, J. M. Landgraf6, J. Lauret6, A. Lebedev6, J. H. Lee6, Y. H. Leung21, N. Lewis6, C. Li49, W. Li43, X. Li46, Y. Li46, Y. Li57, Z. Li46, X. Liang11, Y. Liang30, R. Licenik38,15, T. Lin49, M. A. Lisa39, C. Liu28, F. Liu12, G. Liu47, H. Liu27, H. Liu12, L. Liu12, T. Liu65, X. Liu39, Y. Liu55, Z. Liu12, T. Ljubicic6, W. J. Llope64, O. Lomicky15, R. S. Longacre6, E. M. Loyd11, T. Lu28, N. S. Lukow54, X. F. Luo12, L. Ma20, R. Ma6, Y. G. Ma20, N. Magdy52, D. Mallick36, S. Margetis30, C. Markert56, H. S. Matis32, J. A. Mazer44, G. McNamara64, K. Mi12, S. Mioduszewski55, B. Mohanty36, M. M. Mondal36, I. Mooney65, A. Mukherjee18, M. I. Nagy18, A. S. Nain41, J. D. Nam54, Md. Nasim24, D. Neff10, J. M. Nelson8, D. B. Nemes65, M. Nie49, T. Niida58, R. Nishitani58, T. Nonaka58, G. Odyniec32, A. Ogawa6, S. Oh48, K. Okubo58, B. S. Page6, R. Pak6, J. Pan55, A. Pandav36, A. K. Pandey28, T. Pani44, A. Paul11, B. Pawlik40, D. Pawlowska63, C. Perkins8, J. Pluta63, B. R. Pokhrel54, M. Posik54, T. Protzman33, V. Prozorova15, N. K. Pruthi41, M. Przybycien2, J. Putschke64, Z. Qin57, H. Qiu28, A. Quintero54, C. Racz11, S. K. Radhakrishnan30, N. Raha64, R. L. Ray56, R. Reed33, H. G. Ritter32, C. W. Robertson42, M. Robotkova38,15, M. A. Rosales Aguilar31, D. Roy44, P. Roy Chowdhury63, L. Ruan6, A. K. Sahoo24, N. R. Sahoo49, H. Sako58, S. Salur44, S. Sato58, W. B. Schmidke6, N. Schmitz34, F-J. Seck16, J. Seger14, R. Seto11, P. Seyboth34, N. Shah26, P. V. Shanmuganathan6, T. Shao20, M. Sharma29, N. Sharma24, R. Sharma25, S. R. Sharma25, A. I. Sheikh30, D. Y. Shen20, K. Shen46, S. S. Shi12, Y. Shi49, Q. Y. Shou20, F. Si46, J. Singh41, S. Singha28, P. Sinha25, M. J. Skoby5,42, N. Smirnov65, Y. Söhngen21, Y. Song65, B. Srivastava42, T. D. S. Stanislaus61, M. Stefaniak39, D. J. Stewart64, B. Stringfellow42, Y. Su46, A. A. P. Suaide45, M. Sumbera38, C. Sun52, X. Sun28, Y. Sun46, Y. Sun23, B. Surrow54, Z. W. Sweger9, P. Szymanski63, A. Tamis65, A. H. Tang6, Z. Tang46, T. Tarnowsky35, J. H. Thomas32, A. R. Timmins22, D. Tlusty14, T. Todoroki58, C. A. Tomkiel33, S. Trentalange10, R. E. Tribble55, P. Tribedy6, T. Truhlar15, B. A. Trzeciak15, O. D. Tsai10,6, C. Y. Tsang30,6, Z. Tu6, T. Ullrich6, D. G. Underwood3,61, I. Upsal43, G. Van Buren6, J. Vanek6, I. Vassiliev19, V. Verkest64, F. Videbæk6, S. A. Voloshin64, F. Wang42, G. Wang10, J. S. Wang23, X. Wang49, Y. Wang46, Y. Wang12, Y. Wang57, Z. Wang49, J. C. Webb6, P. C. Weidenkaff21, G. D. Westfall35, D. Wielanek63, H. Wieman32, G. Wilks13, S. W. Wissink27, R. Witt60, J. Wu12, J. Wu28, X. Wu10, Y. Wu11, B. Xi50, Z. G. Xiao57, G. Xie59, W. Xie42, H. Xu23, N. Xu32, Q. H. Xu49, Y. Xu49, Y. Xu12, Z. Xu6, Z. Xu10, G. Yan49, Z. Yan52, C. Yang49, Q. Yang49, S. Yang47, Y. Yang37, Z. Ye43, Z. Ye13, L. Yi49, K. Yip6, Y. Yu49, H. Zbroszczyk63, W. Zha46, C. Zhang52, D. Zhang12, J. Zhang49, S. Zhang46, W. Zhang47, X. Zhang28, Y. Zhang28, Y. Zhang46, Y. Zhang12, Z. J. Zhang37, Z. Zhang6, Z. Zhang13, F. Zhao28, J. Zhao20, M. Zhao6, C. Zhou20, J. Zhou46, S. Zhou12, Y. Zhou12, X. Zhu57, M. Zurek3,6, and M. Zyzak19 (STAR Collaboration)

  • 1Abilene Christian University, Abilene, Texas 79699
  • 2AGH University of Science and Technology, FPACS, Cracow 30-059, Poland
  • 3Argonne National Laboratory, Argonne, Illinois 60439
  • 4American University of Cairo, New Cairo 11835, New Cairo, Egypt
  • 5Ball State University, Muncie, Indiana, 47306
  • 6Brookhaven National Laboratory, Upton, New York 11973
  • 7University of Calabria & INFN-Cosenza, Rende 87036, Italy
  • 8University of California, Berkeley, California 94720
  • 9University of California, Davis, California 95616
  • 10University of California, Los Angeles, California 90095
  • 11University of California, Riverside, California 92521
  • 12Central China Normal University, Wuhan, Hubei 430079
  • 13University of Illinois at Chicago, Chicago, Illinois 60607
  • 14Creighton University, Omaha, Nebraska 68178
  • 15Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic
  • 16Technische Universität Darmstadt, Darmstadt 64289, Germany
  • 17National Institute of Technology Durgapur, Durgapur - 713209, India
  • 18ELTE Eötvös Loránd University, Budapest, Hungary H-1117
  • 19Frankfurt Institute for Advanced Studies FIAS, Frankfurt 60438, Germany
  • 20Fudan University, Shanghai, 200433
  • 21University of Heidelberg, Heidelberg 69120, Germany
  • 22University of Houston, Houston, Texas 77204
  • 23Huzhou University, Huzhou, Zhejiang 313000
  • 24Indian Institute of Science Education and Research (IISER), Berhampur 760010, India
  • 25Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati 517507, India
  • 26Indian Institute Technology, Patna, Bihar 801106, India
  • 27Indiana University, Bloomington, Indiana 47408
  • 28Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000
  • 29University of Jammu, Jammu 180001, India
  • 30Kent State University, Kent, Ohio 44242
  • 31University of Kentucky, Lexington, Kentucky 40506-0055
  • 32Lawrence Berkeley National Laboratory, Berkeley, California 94720
  • 33Lehigh University, Bethlehem, Pennsylvania 18015
  • 34Max-Planck-Institut für Physik, Munich 80805, Germany
  • 35Michigan State University, East Lansing, Michigan 48824
  • 36National Institute of Science Education and Research, HBNI, Jatni 752050, India
  • 37National Cheng Kung University, Tainan 70101
  • 38Nuclear Physics Institute of the CAS, Rez 250 68, Czech Republic
  • 39The Ohio State University, Columbus, Ohio 43210
  • 40Institute of Nuclear Physics PAN, Cracow 31-342, Poland
  • 41Panjab University, Chandigarh 160014, India
  • 42Purdue University, West Lafayette, Indiana 47907
  • 43Rice University, Houston, Texas 77251
  • 44Rutgers University, Piscataway, New Jersey 08854
  • 45Universidade de São Paulo, São Paulo 05314-970, Brazil
  • 46University of Science and Technology of China, Hefei, Anhui 230026
  • 47South China Normal University, Guangzhou, Guangdong 510631
  • 48Sejong University, Seoul, 05006, South Korea
  • 49Shandong University, Qingdao, Shandong 266237
  • 50Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800
  • 51Southern Connecticut State University, New Haven, Connecticut 06515
  • 52State University of New York, Stony Brook, New York 11794
  • 53Instituto de Alta Investigación, Universidad de Tarapacá, Arica 1000000, Chile
  • 54Temple University, Philadelphia, Pennsylvania 19122
  • 55Texas A&M University, College Station, Texas 77843
  • 56University of Texas, Austin, Texas 78712
  • 57Tsinghua University, Beijing 100084
  • 58University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
  • 59University of Chinese Academy of Sciences, Beijing, 101408
  • 60United States Naval Academy, Annapolis, Maryland 21402
  • 61Valparaiso University, Valparaiso, Indiana 46383
  • 62Variable Energy Cyclotron Centre, Kolkata 700064, India
  • 63Warsaw University of Technology, Warsaw 00-661, Poland
  • 64Wayne State University, Detroit, Michigan 48201
  • 65Yale University, New Haven, Connecticut 06520

Phys. Rev. C 107, L061901 – Published 1 June, 2023

DOI: https://doi.org/10.1103/PhysRevC.107.L061901

Abstract

We report systematic measurements of dielectron (e+e−) invariant-mass Mee spectra at midrapidity in Au+Au collisions at sNN = 27, 39, and 62.4 GeV taken with the STAR detector at the Relativistic Heavy Ion Collider. For all energies studied, a significant excess yield of dielectrons is observed in the low-mass region (0.40<Mee<0.75 MeV/c2) compared to hadronic cocktail simulations at freeze-out. Models that include an in-medium broadening of the ρ-meson spectral function consistently describe the observed excess. In addition, we report acceptance-corrected dielectron-excess spectra for Au+Au collisions at midrapidity (|yee|< 1) in the 0–80% centrality bin for each collision energy. The integrated excess yields for 0.4<Mee<0.75GeV/c2, normalized by the charged particle multiplicity at midrapidity, are compared with previously published measurements for Au+Au at sNN1 = 19.6 and 200 GeV. Models that include an in-medium broadening of the ρ-meson spectral function consistently describe the observed excess. The normalized excess yields in the low-mass region show no significant collision energy dependence. The data, however, are consistent with model calculations that demonstrate a modest energy dependence.

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