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Eccentricity distributions in nucleus-nucleus collisions

Abstract : We propose a new parametrization of the distribution of the initial eccentricity in a nucleus-nucleus collision at a fixed centrality, which we name the Elliptic Power distribution. It is a two-parameter distribution, where one of the parameters corresponds to the intrinsic eccentricity, while the other parameter controls the magnitude of eccentricity fluctuations. Unlike the previously used Bessel- Gaussian distribution, which becomes worse for more peripheral collisions, the new Elliptic Power distribution fits several Monte Carlo models of the initial state for all centralities.
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Li Yan, Jean-Yves Ollitrault, Arthur M. Poskanzer. Eccentricity distributions in nucleus-nucleus collisions. Physics Letters, Elsevier, 2014, 90 (02), ⟨10.1103/PhysRevC.90.024903⟩. ⟨cea-01323620⟩

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