Energy Dependence of Acceptance-Corrected Dielectron Excess Mass Spectrum at Mid-Rapidity in Au + Au Collisions at  √sNN = 19.6 and 200 GeV

Adamczyk, L.; Adkins, J.K.; Agakishiev, G.; Aggarwal, M.M.; Ahammed, Z.; Alekseev, I.; Alford, J.; Aparin, A.; Arkhipkin, D.; Aschenauer, E.C.; Averichev, G.S.; Banerjee, A.; Bellwied, R.; Bhasin, A.; Bhati, A.K.; Bhattarai, P.; Bielcik, J.; Bielcikova, J.; Bland, L.C.; Bordyuzhin, I.G.; Bouchet, J.; Brandin, A.V.; Bunzarov, I.; Burton, T.P.; Butterworth, J.; Caines, H.; Calder'on de la Barca S'anchez, M.; Campbell, J.M.; Cebra, D.; Cervantes, M.C.; Chakaberia, I.; Chaloupka, P.; Chang, Z.; Chattopadhyay, S.; Chen, J.H.; Chen, X.; Cheng, J.; Cherney, M.; Christie, W.; Codrington, M.J.M.; Contin, G.; Crawford, H.J.; Das, S.; De Silva, L.C.; Debbe, R.R.; Dedovich, T.G.; Deng, J.; Derevschikov, A.A.; di Ruzza, B.; Didenko, L.; Dilks, C.; Dong, X.; Drachenberg, J.L.; Draper, J.E.; Du, C.M.; Dunkelberger, L.E.; Dunlop, J.C.; Efimov, L.G.; Engelage, J.; Eppley, G.; Esha, R.; Evdokimov, O.; Eyser, O.; Fatemi, R.; Fazio, S.; Federic, P.; Fedorisin, J.; Feng, J.; Filip, P.; Fisyak, Y.; Flores, C.E.; Fulek, L.; Gagliardi, C.A.; Garand, D.; Geurts, F.; Gibson, A.; Girard, M.; Greiner, L.; Grosnick, D.; Gunarathne, D.S.; Guo, Y.; Gupta, S.; Gupta, A.; Guryn, W.; Hamad, A.; Hamed, A.; Haque, R.; Harris, J.W.; He, L.; Heppelmann, S.; Hirsch, A.; Hoffmann, G.W.; Hofman, D.J.; Horvat, S.; Huang, H.Z.; Huang, X.; Huang, B.; Huck, P.; Humanic, T.J.; Igo, G.; Jacobs, W.W.; Jang, H.; Jiang, K.; Judd, E.G.; Kabana, S.; Kalinkin, D.; Kang, K.; Kauder, K.; Ke, H.W.; Keane, D.; Kechechyan, A.; Khan, Z.H.; Kikola, D.P.; Kisel, I.; Kisiel, A.; Klein, S.R.; Koetke, D.D.; Kollegger, T.; Kosarzewski, L.K.; Kotchenda, L.; Kraishan, A.F.; Kravtsov, P.; Krueger, K.; Kulakov, I.; Kumar, L.; Kycia, R.A.; Lamont, M.A.C.; Landgraf, J.M.; Landry, K.D.; Lauret, J.; Lebedev, A.; Lednicky, R.; Lee, J.H.; Li, X.; Li, X.; Li, W.; Li, Z.M.; Li, Y.; Li, C.; Lisa, M.A.; Liu, F.; Ljubicic, T.; Llope, W.J.; Lomnitz, M.; Longacre, R.S.; Luo, X.; Ma, L.; Ma, R.; Ma, G.L.; Ma, Y.G.; Magdy, N.; Majka, R.; Manion, A.; Margetis, S.; Markert, C.; Masui, H.; Matis, H.S.; McDonald, D.; Meehan, K.; Minaev, N.G.; Mioduszewski, S.; Mohanty, B.; Mondal, M.M.; Morozov, D.A.; Mustafa, M.K.; Nandi, B.K.; Nasim, Md.; Nayak, T.K.; Nigmatkulov, G.; Nogach, L.V.; Noh, S.Y.; Novak, J.; Nurushev, S.B.; Odyniec, G.; Ogawa, A.; Oh, K.; Okorokov, V.; Olvitt, D.L.; Page, B.S.; Pan, Y.X.; Pandit, Y.; Panebratsev, Y.; Pawlak, T.; Pawlik, B.; Pei, H.; Perkins, C.; Peterson, A.; Pile, P.; Planinic, M.; Pluta, J.; Poljak, N.; Poniatowska, K.; Porter, J.; Posik, M.; Poskanzer, A.M.; Pruthi, N.K.; Putschke, J.; Qiu, H.; Quintero, A.; Ramachandran, S.; Raniwala, R.; Raniwala, S.; Ray, R.L.; Ritter, H.G.; Roberts, J.B.; Rogachevskiy, O.V.; Romero, J.L.; Roy, A.; Ruan, L.; Rusnak, J.; Rusnakova, O.; Sahoo, N.R.; Sahu, P.K.; Sakrejda, I.; Salur, S.; Sandacz, A.; Sandweiss, J.; Sarkar, A.; Schambach, J.; Scharenberg, R.P.; Schmah, A.M.; Schmidke, W.B.; Schmitz, N.; Seger, J.; Seyboth, P.; Shah, N.; Shahaliev, E.; Shanmuganathan, P.V.; Shao, M.; Sharma, M.K.; Sharma, B.; Shen, W.Q.; Shi, S.S.; Shou, Q.Y.; Sichtermann, E.P.; Sikora, R.; Simko, M.; Skoby, M.J.; Smirnov, N.; Smirnov, D.; Solanki, D.; Song, L.; Sorensen, P.; Spinka, H.M.; Srivastava, B.; Stanislaus, T.D.S.; Stock, R.; Strikhanov, M.; Stringfellow, B.; Sumbera, M.; Summa, B.J.; Sun, Y.; Sun, Z.; Sun, X.M.; Sun, X.; Surrow, B.; Svirida, D.N.; Szelezniak, M.A.; Takahashi, J.; Tang, A.H.; Tang, Z.; Tarnowsky, T.; Tawfik, A.N.; Thomas, J.H.; Timmins, A.R.; Tlusty, D.; Tokarev, M.; Trentalange, S.; Tribble, R.E.; Tribedy, P.; Tripathy, S.K.; Trzeciak, B.A.; Tsai, O.D.; Ullrich, T.; Underwood, D.G.; Upsal, I.; Van Buren, G.; van Nieuwenhuizen, G.; Vandenbroucke, M.; Varma, R.; Vasiliev, A.N.; Vertesi, R.; Videbaek, F.; Viyogi, Y.P.; Vokal, S.; Voloshin, S.A.; Vossen, A.; Wang, Y.; Wang, F.; Wang, H.; Wang, J.S.; Wang, G.; Wang, Y.; Webb, J.C.; Webb, G.; Wen, L.; Westfall, G.D.; Wieman, H.; Wissink, S.W.; Witt, R.; Wu, Y.F.; Xiao, Z.; Xie, W.; Xin, K.; Xu, Z.; Xu, Q.H.; Xu, N.; Xu, H.; Xu, Y.F.; Yang, Y.; Yang, C.; Yang, S.; Yang, Q.; Yang, Y.; Ye, Z.; Yepes, P.; Yi, L.; Yip, K.; Yoo, I.-K.; Yu, N.; Zbroszczyk, H.; Zha, W.; Zhang, J.B.; Zhang, X.P.; Zhang, S.; Zhang, J.; Zhang, Z.; Zhang, Y.; Zhang, J.L.; Zhao, F.; Zhao, J.; Zhong, C.; Zhou, L.; Zhu, X.; Zoulkarneeva, Y.; Zyzak, M.

Author(s)

STAR Collaboration; van Nieuwenhuizen, Gerrit J

Download1-s2.0-S0370269315006450-main.pdf (384.0Kb)

PUBLISHER_CC

Terms of use

Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/

Metadata

Show full item record

Abstract

The acceptance-corrected dielectron excess mass spectra, where the known hadronic sources have been subtracted from the inclusive dielectron mass spectra, are reported for the first time at mid-rapidity |yee|<1 in minimum-bias Au+Au collisions at √sNN=19.6 and 200 GeV. The excess mass spectra are consistently described by a model calculation with a broadened ρ spectral function for Mee<1.1 GeV/c2. The integrated dielectron excess yield at √sNN=19.6 GeV for 0.4<Mee<0.75 GeV/c2, normalized to the charged particle multiplicity at mid-rapidity, has a value similar to that in In+In collisions at √sNN=17.3 GeV. For √sNN=200 GeV, the normalized excess yield in central collisions is higher than that at √sNN=17.3 GeV and increases from peripheral to central collisions. These measurements indicate that the lifetime of the hot, dense medium created in central Au+Au collisions at √sNN=200 GeV is longer than those in peripheral collisions and at lower energies.

Date issued

2015-08

URI

http://hdl.handle.net/1721.1/116630

Department

Massachusetts Institute of Technology. Laboratory for Nuclear Science

Journal

Physics Letters B

Publisher

Elsevier

Citation

Adamczyk, L. et al. “Energy Dependence of Acceptance-Corrected Dielectron Excess Mass Spectrum at Mid-Rapidity in Au + Au Collisions at √sNN = 19.6 and 200 GeV.” Physics Letters B 750 (November 2015): 64–71 © 2015 The Authors

Version: Final published version

ISSN

0370-2693

Collections

MIT Open Access Articles

DSpace@MIT