Beraudo, Andrea, Milhano, Jose Guilherme and Wiedemann, Urs Achim (2012), "Medium-induced color flow softens hadronization", PHYSICAL REVIEW C, 85, 3.
Abstract: Medium-induced parton energy loss, resulting from gluon exchanges
between the QCD matter and partonic projectiles, is expected to underlie
the strong suppression of jets and high-p(T) hadron spectra observed in
ultrarelativistic heavy-ion collisions. Here, we present the first
color-differential calculation of parton energy loss. We find that color
exchange between medium and projectile decoheres the color of radiated
gluons from that of the most energetic fragments and enhances
parametrically the invariant mass of energetic color singlet clusters in
the parton shower. These effects are seen in more than half of the
medium-modified parton branchings. As shown for a cluster hadronization
model and as argued for a Lund string fragmentation model, this leads to
additional softening of hadronic spectra. Compared to standard parton
energy loss calculations, a lower density of the QCD matter is then
needed to account for the nuclear modification factor at the Large
Hadron Collider.
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