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Aggarwal, M M; Ahammed, Z; Alakhverdyants, A V; Alford, J; Anderson, B D; Averichev, G S; Barnby, L S; Baumgart, S; Bellwied, R; Bhati, A K; Bichsel, H; Bielcik, J; Bridgeman, A; Cai, X Z; Cebra, D; Chen, J Y; Choi, K E; Clarke, R F; De Silva, L C; Derradi de Souza, R; Djawotho, P; Drachenberg, J L; Elhalhuli, E; Elnimr, M; Erazmus, B; Fatemi, R; Filip, P; Finch, E; Fisyak, Y; Gordon, A; Han, L-X; Hofman, D J; Jones, C L; Kabana, S; Kapitan, J; Knospe, A G; Kocoloski, A; Koroleva, L; Kouchpil, V; LaPointe, S; Lebedev, A; Li, N; Li, X; Lisa, M A; Liu, F; Ljubicic, T; Lu, Y; Lukashov, E V; Meschanin, A; Milner, R; Morozov, D A; Nandi, B K; Nelson, J M; Oldag, E W; Pandit, Y; Panebratsev, Y; Pawlak, T; Plyku, D; Poljak, N; Poskanzer, A M; Pruneau, C; Pruthi, N K; Putschke, J; Qiu, H; Roberts, J B; Seyboth, P; Shahaliev, E; Shao, M; Sharma, M; Simon, F; Singaraju, R N; Sorensen, P; Spinka, H M; Suaide, A A P; Sun, Y; Symons, T J M; Tang, A H; Thein, D; Tram, V N; Trentalange, S; Tribble, R E; Ulery, J; Videbaek, F; Vokal, S; Wada, M; Walker, M; Wang, G; Webb, G; Webb, J C; Wissink, S W; Xie, W; Xu, Y; Yepes, P; Yip, K; Zhang, J B; Zhang, W M; Zhang, X P; Zhao, J; Zhou, W; Zhu, X
Physical review letters, 07/2010, Letnik: 105, Številka: 2Journal Article
We report the first measurements of the kurtosis (κ), skewness (S), and variance (σ2) of net-proton multiplicity (Np-Np) distributions at midrapidity for Au+Au collisions at square root of s(NN)=19.6, 62.4, and 200 GeV corresponding to baryon chemical potentials (μB) between 200 and 20 MeV. Our measurements of the products κσ2 and Sσ, which can be related to theoretical calculations sensitive to baryon number susceptibilities and long-range correlations, are constant as functions of collision centrality. We compare these products with results from lattice QCD and various models without a critical point and study the square root of s(NN) dependence of κσ2. From the measurements at the three beam energies, we find no evidence for a critical point in the QCD phase diagram for μB below 200 MeV.
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