QCD Evolution Equations for High Energy Partons in Nuclear Matter

Details QCD Evolution Equations for High Energy Partons in Nuclear Matter QCD Evolution Equations for High Energy Partons in Nuclear Matter

1993-12-15

arxiv.org/abs/hep-ph/9312281v1

Phys.Rev.D50:337-357,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

47 pages, RevTeX, uuencoded file, 9 figures available on request, DUKE-TH-93-60/ NSF-ITP-93-149

Scientific paper

10.1103/PhysRevD.50.337

We derive a generalized form of Altarelli-Parisi equations to decribe the time evolution of parton distributions in a nuclear medium. In the framework of the leading logarithmic approximation, we obtain a set of coupled integro- differential equations for the parton distribution functions and equations for the virtuality (``age'') distribution of partons. In addition to parton branching processes, we take into account fusion and scattering processes that are specific to QCD in medium. Detailed balance between gain and loss terms in the resulting evolution equations correctly accounts for both real and virtual contributions which yields a natural cancellation of infrared divergences.

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