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arXiv · 1109.5025

Medium-induced color flow softens hadronization

A. Beraudo·J. G. Milhano·U. A. Wiedemann
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Abstract

Medium-induced parton energy loss, resulting from gluon exchanges between the QCD matter and partonic projectiles, is expected to underly the strong suppression of jets and high-$p_T$ hadron spectra observed in ultra-relativistic heavy ion collisions. Here, we present the first color-differential calculation of parton energy loss. We find that color exchange between medium and projectile enhances the invariant mass of energetic color singlet clusters in the parton shower by a parametrically large factor proportional to the square root of the projectile energy. This effect is seen in more than half of the most energetic color-singlet fragments of medium-modified parton branchings. Applying a standard cluster hadronization model, we find that it leads to a characteristic additional softening of hadronic spectra. A fair description of the nuclear modification factor measured at the LHC may then be obtained for relatively low momentum transfers from the medium.

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A. Beraudo, J. G. Milhano, U. A. Wiedemann. 2011-09-23. Medium-induced color flow softens hadronization. https://doi.org/10.1103/physrevc.85.031901

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