Dielectron Mass Spectra from Au+Au Collisions at sNN=200 GeV
Year: 2014
Type: article
Abstract: We report the STAR measurements of dielectron (${e}^{+}{e}^{\ensuremath{-}}$) production at midrapidity ($|{y}_{ee}|<1$) in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$. The measurements are evaluated in different invariant mass regions with a focus on 0.30--0.76 ($\ensuremath{\rho}$-like), 0.76--0.80 ($\ensuremath{\omega}$-like), and 0.98--1.05 ($\ensuremath{\phi}$-like) $\text{ }\mathrm{GeV}/{\mathrm{c}}^{2}$. The spectrum in the $\ensuremath{\omega}$-like and $\ensuremath{\phi}$-like regions can be well described by the hadronic cocktail simulation. In the $\ensuremath{\rho}$-like region, however, the vacuum $\ensuremath{\rho}$ spectral function cannot describe the shape of the dielectron excess. In this range, an enhancement of $1.77\ifmmode\pm\else\textpm\fi{}0.11(\text{stat})\ifmmode\pm\else\textpm\fi{}0.24(\text{syst})\ifmmode\pm\else\textpm\fi{}0.33(\text{cocktail})$ is determined with respect to the hadronic cocktail simulation that excludes the $\ensuremath{\rho}$ meson. The excess yield in the $\ensuremath{\rho}$-like region increases with the number of collision participants faster than the $\ensuremath{\omega}$ and $\ensuremath{\phi}$ yields. Theoretical models with broadened $\ensuremath{\rho}$ contributions through interactions with constituents in the hot QCD medium provide a consistent description of the dilepton mass spectra for the measurement presented here and the earlier data at the Super Proton Synchrotron energies.
Source: Physical Review Letters
Authors: L. Adamczyk, J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, J. Alford, C. D. Anson, A. Aparin, D. Arkhipkin, E. C. Aschenauer, G. S. Averichev, A. Banerjee, Z. Barnovska, D. R. Beavis, R. Bellwied, A. Bhasin, A. K. Bhati, P. Bhattarai, H. Bichsel, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, W. Borowski, J. Bouchet, A. V. Brandin, S. G. Brovko, S. Bültmann, I. Bunzarov, T. P. Burton, J. Butterworth, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, R. Cendejas, M. C. Cervantes, P. Chaloupka, Z. Chang, S. Chattopadhyay, H. F. Chen, J. H. Chen, L. Chen, J. Cheng, M. Cherney, A. Chikanian, W. Christie, J. Chwastowski, M. J. M. Codrington, J. G. Cramer, H. J. Crawford, X. Cui, S. Das, A. Davila Leyva, L. C. De Silva, R. R. Debbe, T. G. Dedovich, J. Deng, A. A. Derevschikov, R. Derradi de Souza, S. Dhamija, B. di Ruzza, L. Didenko, C. Dilks, F. Ding, P. Djawotho, X. Dong, J. L. Drachenberg, J. E. Draper, C. M. Du, L. E. Dunkelberger, J. C. Dunlop, L. G. Efimov, J. Engelage, K. S. Engle, G. Eppley, L. Eun, O. Evdokimov, R. Fatemi, S. Fazio, J. Fedorisin, P. Filip, E. Finch, Y. Fisyak, C. E. Flores, C. A. Gagliardi, D. R. Gangadharan, D. Garand, F. Geurts, A. Gibson, M. Girard, S. Gliske, D. Grosnick, Y. Guo, A. Gupta, S. Gupta, W. Guryn, B. Haag, O. Hajkova, A. Hamed, L.-X. Han, R. Haque, J. W. Harris, S. Heppelmann, A. Hirsch, G. W. Hoffmann, D. J. Hofman, S. Horvat, B. Huang, H. Z. Huang, X. Huang, P. Huck, T. J. Humanic, G. Igo, W. W. Jacobs, H. Jang, E. G. Judd, S. Kabana, D. Kalinkin, K. Kang, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, A. Kesich, Z. H. Khan, D. P. Kikola, I. Kisel, A. Kisiel, D. D. Koetke, T. Kollegger, J. Konzer, I. Koralt, W. Korsch, L. Kotchenda, P. Kravtsov, K. Krueger, I. Kulakov, L. Kumar, R. A. Kycia, M. A. C. Lamont, J. M. Landgraf, K. D. Landry, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, M. J. LeVine, C. Li, W. Li, X. Li, X. Li, Y. Li, Z. M. Li, L. M. Lima, M. A. Lisa, F. Liu, T. Ljubicic, W. J. Llope, R. S. Longacre, X. Luo, G. L. Ma, Y. G. Ma, D. M. M. D. Madagodagettige Don, D. P. Mahapatra, R. Majka, S. Margetis, C. Markert, H. Masui, H. S. Matis, D. McDonald, T. S. McShane, N. G. Minaev, S. Mioduszewski, B. Mohanty, M. M. Mondal, D. A. Morozov, M. G. Munhoz, M. K. Mustafa, B. K. Nandi, Md. Nasim, T. K. Nayak, J. M. Nelson, L. V. Nogach, S. Y. Noh, J. Novak, S. B. Nurushev, G. Odyniec, A. Ogawa, K. Oh, A. Ohlson, V. Okorokov, E. W. Oldag, R. A. N. Oliveira, M. Pachr, B. S. Page, S. K. Pal, Y. X. Pan, Y. Pandit, Y. Panebratsev, T. Pawlak, B. Pawlik, H. Pei, C. Perkins, W. Peryt, P. Pile, M. Planinic, J. Pluta, D. Plyku, N. Poljak, J. Porter, A. M. Poskanzer, N. K. Pruthi, M. Przybycien, P. R. Pujahari, H. Qiu, A. Quintero, S. Ramachandran, R. Raniwala, S. Raniwala, R. L. Ray, C. K. Riley, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, J. F. Ross, A. Roy, L. Ruan, J. Rusnak, N. R. Sahoo, P. K. Sahu, I. Sakrejda, S. Salur, A. Sandacz, J. Sandweiss, E. Sangaline, A. Sarkar, J. Schambach, R. P. Scharenberg, A. M. Schmah, W. B. Schmidke, N. Schmitz, J. Seger, P. Seyboth, N. Shah, E. Shahaliev, P. V. Shanmuganathan, M. Shao, B. Sharma, W. Q. Shen, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, R. N. Singaraju, M. J. Skoby, D. Smirnov, N. Smirnov, D. Solanki, P. Sorensen, U. G. deSouza, H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, J. R. Stevens, R. Stock, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. Sumbera, X. Sun, X. M. Sun, Y. Sun, Z. Sun, B. Surrow, D. N. Svirida, T. J. M. Symons, A. Szanto de Toledo, J. Takahashi, A. H. Tang, Z. Tang, T. Tarnowsky, J. H. Thomas, A. R. Timmins, D. Tlusty, M. Tokarev, S. Trentalange, R. E. Tribble, P. Tribedy, B. A. Trzeciak, O. D. Tsai, J. Turnau, T. Ullrich, D. G. Underwood, G. Van Buren, G. van Nieuwenhuizen, J. A. Vanfossen, R. Varma, G. M. S. Vasconcelos, A. N. Vasiliev, R. Vertesi, F. Videbæk, Y. P. Viyogi, S. Vokal, A. Vossen, M. Wada, F. Wang, G. Wang, H. Wang, J. S. Wang, X. L. Wang, Y. Wang, Y. Wang, G. Webb, J. C. Webb, G. D. Westfall, H. Wieman, S. W. Wissink, R. Witt, Y. F. Wu, Z. Xiao, W. Xie, K. Xin, H. Xu, N. Xu, Q. H. Xu, Y. Xu, Z. Xu, W. Yan, C. Yang, Y. Yang, Y. Yang, Z. Ye, P. Yepes, L. Yi, K. Yip, I.-K. Yoo, Y. Zawisza, H. Zbroszczyk, W. Zha, J. B. Zhang, J. L. Zhang, S. Zhang, X. P. Zhang, Y. Zhang, Z. P. Zhang, F. Zhao, J. Zhao, C. Zhong, X. Zhu, Y. H. Zhu, Y. Zoulkarneeva, M. Zyzak
Institutions: AGH University of Krakow, University of Kentucky, Joint Institute for Nuclear Research, Panjab University, Variable Energy Cyclotron Centre, Institute for Theoretical and Experimental Physics, Kent State University, The Ohio State University, Brookhaven National Laboratory, Czech Academy of Sciences, Nuclear Physics Institute, University of Houston, University of Jammu, The University of Texas at Austin, University of Washington, Czech Technical University in Prague, Laboratoire de Physique Subatomique et des Technologies Associées, Nantes Université, National Research Nuclear University MEPhI, University of California, Davis, Old Dominion University, Rice University, Yale University, Pennsylvania State University, Texas A&M University, University of Science and Technology of China, Shanghai Institute of Applied Physics, Central China Normal University, Tsinghua University, Creighton University, Cracow University of Technology, University of California, Berkeley, Institute of Physics, Bhubaneshwar, Shandong University, Institute for High Energy Physics, Universidade Estadual de Campinas (UNICAMP), Indiana University Bloomington, Indiana University, Lawrence Berkeley National Laboratory, Valparaiso University, Institute of Modern Physics, University of California, Los Angeles, United States Naval Academy, University of Illinois Chicago, Purdue University West Lafayette, Warsaw University of Technology, Argonne National Laboratory, National Institute of Science Education and Research, Korea Institute of Science & Technology Information, Frankfurt Institute for Advanced Studies, Temple University, Universidade de São Paulo, Indian Institute of Technology Bombay, University of Birmingham, Michigan State University, Pusan National University, Institute of Nuclear Physics, Polish Academy of Sciences, University of Zagreb, University of Rajasthan, Max Planck Institute for Physics, Massachusetts Institute of Technology
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, National Energy Research Scientific Computing Center, National Research Foundation, Department of Science and Technology, Ministry of Science and Technology, India, Fundação de Amparo à Pesquisa do Estado de São Paulo, National Natural Science Foundation of China, Ministry of Education and Science of the Russian Federation, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Korea Institute of Science and Technology Information, Ministry of Education, India, Centre National de la Recherche Scientifique, Office of Science, National Key Research and Development Program of China, Institut National de Physique Nucléaire et de Physique des Particules, Lawrence Berkeley National Laboratory
OpenAlex ID: W1543685928