Medium-induced color flow softens hadronization

被引：24

作者：

Beraudo, Andrea ^{[1
,2
]}

Milhano, Jose Guilherme ^{[1
,3
]}

Wiedemann, Urs Achim ^{[1
]}

机构：

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

[2] Ctr Studi & Ric Enrico Fermi, I-00184 Rome, Italy

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

来源：

PHYSICAL REVIEW C | 2012年 / 85卷 / 03期

关键词：

D O I：

10.1103/PhysRevC.85.031901

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

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.

引用

页数：4

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