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For Au + Au collisions at 200 GeV we measure neutral pion production withgood statistics for transverse momentum, p_T, up to 20 GeV/c. A fivefoldsuppression is found, which is essentially constant for 5 < p_T < 20 GeV/c.Experimental uncertainties are small enough to constrain any model-dependentparameterization for the transport coefficient of the medium, e.g. \mean(q^hat)in the parton quenching model. The spectral shape is similar for all collisionclasses, and the suppression does not saturate in Au+Au collisions; instead, itincreases proportional to the number of participating nucleons, as N_part^2/3.

physical review letters

Suppression pattern of neutral pions at high transverse momentum in  Au+Au collisions at sqrt(s_NN) = 200 GeV and constraints on medium transport  coefficients