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Adkins, J.K.; Averichev, G.S.; Bellwied, R.; Bhasin, A.; Bhattarai, P.; Bland, L.C.; Bouchet, J.; Burton, T.P.; Caines, H.; Calder'on de la Barca S'anchez, M.; Cervantes, M.C.; Chaloupka, P.; Chattopadhyay, S.; Chen, J.H.; Chen, X.; Cheng, J.; Das, S.; Didenko, L.; Dunlop, J.C.; Eppley, G.; Evdokimov, O.; Fatemi, R.; Fisyak, Y.; Garand, D.; Gupta, S.; Gupta, A.; Hamad, A.; He, L.; Hirsch, A.; Huang, H.Z.; Huck, P.; Igo, G.; Kalinkin, D.; Khan, Z.H.; Koetke, D.D.; Kosarzewski, L.K.; Kraishan, A.F.; Lednicky, R.; Li, X.; Liu, F.; Longacre, R.S.; Luo, X.; Ma, G.L.; Magdy, N.; Matis, H.S.; Meehan, K.; Mohanty, B.; Mondal, M.M.; Nogach, L.V.; Noh, S.Y.; Novak, J.; Nurushev, S.B.; Oh, K.; Okorokov, V.; Olvitt, D.L.; Pan, Y.X.; Pandit, Y.; Pawlik, B.; Pei, H.; Pile, P.; Planinic, M.; Pruthi, N.K.; Raniwala, R.; Ray, R.L.; Ritter, H.G.; Romero, J.L.; Rusnak, J.; Rusnakova, O.; Sahoo, N.R.; Sakrejda, I.; Smirnov, D.; Spinka, H.M.; Stock, R.; Stringfellow, B.; Summa, B.J.; Sun, X.M.; Svirida, D.N.; Tang, A.H.; Tang, Z.; Thomas, J.H.; Tripathy, S.K.; Tsai, O.D.; Upsal, I.; Vandenbroucke, M.; Varma, R.; Vasiliev, A.N.; Vertesi, R.; Webb, G.; Wen, L.; Xin, K.; Xu, Q.H.; Xu, H.; Yip, K.; Zbroszczyk, H.; Zhang, S.; Zhang, J.; Zhao, F.; Zhao, J.; Zhou, L.; Zhu, X.
Physics letters. B, 11/2015, Letnik: 750, Številka: CJournal Article
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.
