Beraudo, Andrea, Milhano, Jose Guilherme and Wiedemann, Urs Achim (2012), "The contribution of medium-modified color flow to jet quenching", JOURNAL OF HIGH ENERGY PHYSICS, 7.
Abstract: Multiple interactions between parton showers and the surrounding QCD
matter are expected to underlie the strong medium-modifications of jet
observables in ultra-relativistic heavy ion collisions at RHIC and at
the LHC. Here, we note that such jet-medium interactions alter
generically and characteristically the color correlations in the parton
shower. We characterize these effects in a color-differential
calculation of the medium-induced gluon radiation spectrum to first and
second order in opacity. by interfacing simple branching histories of
medium-modified color flow with the LUND hadronization model, we analyze
how the medium modification of color correlations can affect the
distribution of hadronic fragments in jets. Importantly, we observe that
jet-medium interactions give rise to the medium-induced color
decoherence of gluons from the parton shower. Since hadronization
respects color flow and since each color singlet in a parton shower is
hadronized separately, this medium-induced color decoherence leaves
characteristic signatures in the jet fragmentation pattern. In
particular, it can contribute to the quenching of leading hadron
spectra. Moreover, it can increase strongly the yield of soft hadronic
fragments from a jet, while the distribution of more energetic hadrons
follows naturally the shape of a vacuum-like fragmentation pattern of
lower total energy.
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