Explaining jet quenching with perturbative QCD alone

Details Explaining jet quenching with perturbative QCD alone Explaining jet quenching with perturbative QCD alone

2011-11-29

arxiv.org/abs/1111.6838v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures, v2: extended fig. 3 to large pt + minor changes

Scientific paper

We present a new formulation of jet quenching in perturbative QCD beyond the eikonal approximation. Multiple scattering in the medium is modelled through infra-red-continued (2 -> 2) scattering matrix elements in QCD and the parton shower describing further emissions. The interplay between these processes is arranged in terms of a formation time constraint such that coherent emissions can be treated consistently. Emerging partons are hadronised by the Lund string model, tuned to describe LEP data in conjunction with the parton shower. Based on this picture we obtain a good description of the nuclear modification factor R_AA at RHIC and LHC.

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