On p_T-broadening of high energy partons associated with the LPM effect in a finite-volume QCD medium

Abstract

We study the contributions from radiation to $p_{\perp }$-broadening of a high energy parton traversing a QCD medium with a finite length $L$. The interaction between the parton and the medium is described by decorrelated static multiple scattering. Amplitudes of medium-induced gluon emission and parton self-energy diagrams are evaluated in the soft gluon limit in the BDMPS formalism. We find both the double-logarithmic correction from incoherent scattering, which is parametrically the same as that in single scattering, and the logarithmic correction from the LPM effect. Therefore, we expect a parametrically large correction from radiation to the medium-induced $p_{\perp }$-broadening in perturbative QCD.

19 pages, focusing only on calculations about the medium-induced diagrams, origin for double-log reinterpreted, final version to appear in JHEP

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• Jet quenching parameter in an expanding QCD plasma
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• Classical vs quantum corrections to jet broadening in a weakly-coupled Quark-Gluon Plasma
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• Radiative quark $p_T$-broadening in a quark-gluon plasma beyond the soft gluon approximation
• Anisotropic Flow and Jet Quenching in Relativistic Nuclear Collisions
• Radiative $p_{\perp }$-broadening of fast partons in an expanding quark-gluon plasma
• Theory of Jet Quenching in Ultra-Relativistic Nuclear Collisions
• Multi-particle correlations and KNO scaling in the medium-induced jet evolution
• Recent progress on the understanding of the medium-induced jet evolution and energy loss in pQCD