The probability distribution for collisional energy loss of a fast parton in hot QCD matter is derived from a resummed kinetic equation using hard-thermal-loop scatterings.
The QCD collisional energy loss revised
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abstract
It is shown that to leading order the QCD collisional energy loss reads $dE/dx \sim \alpha(m_D^2)T^2$. Compared to prevalent expressions, $dE^B/dx \sim \alpha^2 T^2 \ln(ET/m_D^2)$, which could be considered adaptions of the (QED) Bethe-Bloch formula, the rectified result takes into account the running coupling, as dictated by renormalization. As one significant consequence, due to asymptotic freedom, the collisional energy loss becomes independent of the jet energy $E$. Some implications with regard to heavy ion collisions are pointed out.
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Extends drag coefficient with momentum-dependent polynomials and evolves charm/bottom distributions via Fokker-Planck to compute R_AA in 5.02 TeV Pb-Pb collisions for comparison to ALICE/ATLAS data.
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Collisional energy loss distribution of a fast parton in a hot or dense QCD medium
The probability distribution for collisional energy loss of a fast parton in hot QCD matter is derived from a resummed kinetic equation using hard-thermal-loop scatterings.
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Impact of momentum-dependent drag coefficient on energy loss of charm and bottom quarks in QGP
Extends drag coefficient with momentum-dependent polynomials and evolves charm/bottom distributions via Fokker-Planck to compute R_AA in 5.02 TeV Pb-Pb collisions for comparison to ALICE/ATLAS data.