Dielectron mass spectra from Au+Au collisions at √[s(NN)]=200  GeV.

Published

Journal Article

We report the STAR measurements of dielectron (e(+)e(-)) production at midrapidity (|y(ee)|<1) in Au+Au collisions at √[s(NN)]=200  GeV. The measurements are evaluated in different invariant mass regions with a focus on 0.30-0.76 (ρ-like), 0.76-0.80 (ω-like), and 0.98-1.05 (ϕ-like)   GeV/c(2). The spectrum in the ω-like and ϕ-like regions can be well described by the hadronic cocktail simulation. In the ρ-like region, however, the vacuum ρ spectral function cannot describe the shape of the dielectron excess. In this range, an enhancement of 1.77±0.11(stat)±0.24(syst)±0.33(cocktail) is determined with respect to the hadronic cocktail simulation that excludes the ρ meson. The excess yield in the ρ-like region increases with the number of collision participants faster than the ω and ϕ yields. Theoretical models with broadened ρ 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.

Full Text

Duke Authors

Cited Authors

  • Adamczyk, L; Adkins, JK; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Alekseev, I; Alford, J; Anson, CD; Aparin, A; Arkhipkin, D; Aschenauer, EC; Averichev, GS; Banerjee, A; Barnovska, Z; Beavis, DR; Bellwied, R; Bhasin, A; Bhati, AK; Bhattarai, P; Bichsel, H; Bielcik, J; Bielcikova, J; Bland, LC; Bordyuzhin, IG; Borowski, W; Bouchet, J; Brandin, AV; Brovko, SG; Bültmann, S; Bunzarov, I; Burton, TP; Butterworth, J; Caines, H; Calderón de la Barca Sánchez, M; Cebra, D; Cendejas, R; Cervantes, MC; Chaloupka, P; Chang, Z; Chattopadhyay, S; Chen, HF; Chen, JH; Chen, L; Cheng, J; Cherney, M; Chikanian, A; Christie, W; Chwastowski, J; Codrington, MJM; Cramer, JG; Crawford, HJ; Cui, X; Das, S; Davila Leyva, A; De Silva, LC; Debbe, RR; Dedovich, TG; Deng, J; Derevschikov, AA; Derradi de Souza, R; Dhamija, S; di Ruzza, B; Didenko, L; Dilks, C; Ding, F; Djawotho, P; Dong, X; Drachenberg, JL; Draper, JE; Du, CM; Dunkelberger, LE; Dunlop, JC; Efimov, LG; Engelage, J; Engle, KS; Eppley, G; Eun, L; Evdokimov, O; Fatemi, R; Fazio, S; Fedorisin, J; Filip, P; Finch, E; Fisyak, Y; Flores, CE; Gagliardi, CA; Gangadharan, DR; Garand, D; Geurts, F; Gibson, A; Girard, M; Gliske, S; Grosnick, D; Guo, Y; Gupta, A; Gupta, S; Guryn, W; Haag, B; Hajkova, O; Hamed, A; Han, L-X; Haque, R; Harris, JW; Heppelmann, S; Hirsch, A; Hoffmann, GW; Hofman, DJ; Horvat, S; Huang, B; Huang, HZ; Huang, X; Huck, P; Humanic, TJ; Igo, G; Jacobs, WW; Jang, H; Judd, EG; Kabana, S; Kalinkin, D; Kang, K; Kauder, K; Ke, HW; Keane, D; Kechechyan, A; Kesich, A; Khan, ZH; Kikola, DP; Kisel, I; Kisiel, A; Koetke, DD; Kollegger, T; Konzer, J; Koralt, I; Korsch, W; Kotchenda, L; Kravtsov, P; Krueger, K; Kulakov, I; Kumar, L; Kycia, RA; Lamont, MAC; Landgraf, JM; Landry, KD; Lauret, J; Lebedev, A; Lednicky, R; Lee, JH; LeVine, MJ; Li, C; Li, W; Li, X; Li, Y; Li, ZM; Lima, LM; Lisa, MA; Liu, F; Ljubicic, T; Llope, WJ; Longacre, RS; Luo, X; Ma, GL; Ma, YG; Madagodagettige Don, DMMD; Mahapatra, DP; Majka, R; Margetis, S; Markert, C; Masui, H; Matis, HS; McDonald, D; McShane, TS; Minaev, NG; Mioduszewski, S; Mohanty, B; Mondal, MM; Morozov, DA; Munhoz, MG; Mustafa, MK; Nandi, BK; Nasim, M; Nayak, TK; Nelson, JM; Nogach, LV; Noh, SY; Novak, J; Nurushev, SB; Odyniec, G; Ogawa, A; Oh, K; Ohlson, A; Okorokov, V; Oldag, EW; Oliveira, RAN; Pachr, M; Page, BS; Pal, SK; Pan, YX; Pandit, Y; Panebratsev, Y; Pawlak, T; Pawlik, B; Pei, H; Perkins, C; Peryt, W; Pile, P; Planinic, M; Pluta, J; Plyku, D; Poljak, N; Porter, J; Poskanzer, AM; Pruthi, NK; Przybycien, M; Pujahari, PR; Qiu, H; Quintero, A; Ramachandran, S; Raniwala, R; Raniwala, S; Ray, RL; Riley, CK; Ritter, HG; Roberts, JB; Rogachevskiy, OV; Romero, JL; Ross, JF; Roy, A; Ruan, L; Rusnak, J; Sahoo, NR; Sahu, PK; Sakrejda, I; Salur, S; Sandacz, A; Sandweiss, J; Sangaline, E; Sarkar, A; Schambach, J; Scharenberg, RP; Schmah, AM; Schmidke, WB; Schmitz, N; Seger, J; Seyboth, P; Shah, N; Shahaliev, E; Shanmuganathan, PV; Shao, M; Sharma, B; Shen, WQ; Shi, SS; Shou, QY; Sichtermann, EP; Singaraju, RN; Skoby, MJ; Smirnov, D; Smirnov, N; Solanki, D; Sorensen, P; deSouza, UG; Spinka, HM; Srivastava, B; Stanislaus, TDS; Stevens, JR; Stock, R; Strikhanov, M; Stringfellow, B; Suaide, AAP; Sumbera, M; Sun, X; Sun, XM; Sun, Y; Sun, Z; Surrow, B; Svirida, DN; Symons, TJM; Szanto de Toledo, A; Takahashi, J; Tang, AH; Tang, Z; Tarnowsky, T; Thomas, JH; Timmins, AR; Tlusty, D; Tokarev, M; Trentalange, S; Tribble, RE; Tribedy, P; Trzeciak, BA; Tsai, OD; Turnau, J; Ullrich, T; Underwood, DG; Van Buren, G; van Nieuwenhuizen, G; Vanfossen, JA; Varma, R; Vasconcelos, GMS; Vasiliev, AN; Vertesi, R; Videbæk, F; Viyogi, YP; Vokal, S; Vossen, A; Wada, M; Wang, F; Wang, G; Wang, H; Wang, JS; Wang, XL; Wang, Y; Webb, G; Webb, JC; Westfall, GD; Wieman, H; Wissink, SW; Witt, R; Wu, YF; Xiao, Z; Xie, W; Xin, K; Xu, H; Xu, N; Xu, QH; Xu, Y; Xu, Z; Yan, W; Yang, C; Yang, Y; Ye, Z; Yepes, P; Yi, L; Yip, K; Yoo, I-K; Zawisza, Y; Zbroszczyk, H; Zha, W; Zhang, JB; Zhang, JL; Zhang, S; Zhang, XP; Zhang, Y; Zhang, ZP; Zhao, F; Zhao, J; Zhong, C; Zhu, X; Zhu, YH; Zoulkarneeva, Y; Zyzak, M; STAR Collaboration,

Published Date

  • July 9, 2014

Published In

Volume / Issue

  • 113 / 2

Start / End Page

  • 022301 -

PubMed ID

  • 25062167

Pubmed Central ID

  • 25062167

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.113.022301

Language

  • eng