The contribution of medium-modified color flow to jet quenching

被引：17

作者：

Beraudo, Andrea ^{[1
]}

Milhano, Jose Guilherme ^{[1
,2
]}

Wiedemann, Urs Achim ^{[1
]}

机构：

[1] CERN, Theory Unit, Dept Phys, CH-1211 Geneva 23, Switzerland

[2] Univ Tecn Lisboa, Inst Super Tecn, CENTRA, P-1049001 Lisbon, Portugal

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2012年 / 07期

关键词：

Heavy Ion Phenomenology; RADIATIVE ENERGY-LOSS; COLLISIONS; FRAGMENTATION; SUPPRESSION; MOMENTUM; MATTER;

D O I：

10.1007/JHEP07(2012)144

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

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.

引用

页数：43

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