Perturbative QCD Description of Heavy and Light Flavor Jet Quenching

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2010-12-21

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American Physical Society

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We present a successful description of the medium modification of light and heavy flavor jets within a perturbative-QCD-based approach. Only the couplings involving hard partons are assumed to be weak. The effect of the medium on a hard parton, per unit time, is encoded in terms of three nonperturbative, related transport coefficients which describe the transverse momentum squared gained, the elastic energy loss, and diffusion in elastic energy transfer. Scaling the transport coefficients with the temperature of the medium, we achieve a good description of the centrality dependence of the suppression and the azimuthal anisotropy of leading hadrons. Imposing additional constraints based on leading order (LO) hard thermal loop (HTL) effective theory leads to a worsening of the fit, implying the necessity of computing transport coefficients beyond LO HTL.

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Guang-You Qin and Abhijit Majumder, "Perturbative QCD Description of Heavy and Light Flavor Jet Quenching," Physical Review Letters 105, no. 26 (2010), doi:10.1103/PhysRevLett.105.262301