Eccentricity distributions in nucleus-nucleus collisions

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.