Regular Article - Theoretical Physics
Fragmentation function in non-equilibrium QCD using closed-time path integral formalism
Department of Physics, University of Illinois, Chicago, IL, 60607, USA
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Published online: 9 January 2009
In this paper we implement the Schwinger–Keldysh closed-time path integral formalism in non-equilibrium QCD in accordance to the definition of the Collins–Soper fragmentation function. We consider a high-p T parton in QCD medium at initial time τ 0 with an arbitrary non-equilibrium (non-isotropic) distribution function fragmenting to a hadron. We formulate the parton-to-hadron fragmentation function in non-equilibrium QCD in the light-cone quantization formalism. It may be possible to include final-state interactions with the medium via a modification of the Wilson lines in this definition of the non-equilibrium fragmentation function. This may be relevant to the study of hadron production from a quark–gluon plasma at RHIC and LHC.
PACS: 12.39.St – / 13.87.Fh – / 13.87.Ce – / 13.85.Ni –
© Springer-Verlag , 2009