RT Journal Article
T1 Medium-induced gluon radiation and colour decoherence beyond the soft approximation
A1 Apolinário, Liliana Marisa Cunha
A1 Armesto Pérez, Néstor
A1 Milhano, José Guilherme Teixeira da Almeida
A1 Salgado López, Carlos Alberto
K1 Jets
K1 Heavy ion phenomenology
AB We derive the in-medium gluon radiation spectrum off a quark within the pathintegral formalism at finite energies, including all next-to-eikonal corrections in the propagatorsof quarks and gluons. Results are computed for finite formation times, includinginterference with vacuum amplitudes. By rewriting the medium averages in a convenientmanner we present the spectrum in terms of dipole cross sections and a colour decoherenceparameter with the same physical origin as that found in previous studies of the antennaradiation. This factorisation allows us to present a simple physical picture of the mediuminducedradiation for any value of the formation time, that is of interest for a probabilisticimplementation of the modified parton shower. Known results are recovered for the particularcases of soft radiation and eikonal quark and for the case of a very long medium,with length much larger than the average formation times for medium-induced radiation.Technical details of the computation of the relevant n-point functions in colour space and ofthe required path integrals in transverse space are provided. The final result completes thecalculation of all finite energy corrections for the radiation off a quark in a QCD mediumthat exist in the small angle approximation and for a recoilless medium
PB Springer
SN 1029-8479
YR 2015
FD 2015
LK http://hdl.handle.net/10347/21448
UL http://hdl.handle.net/10347/21448
LA eng
NO Apolinário, L., Armesto, N., Milhano, J.G. et al. Medium-induced gluon radiation and colour decoherence beyond the soft approximation. J. High Energ. Phys. 2015, 119 (2015). https://doi.org/10.1007/JHEP02(2015)119
DS Minerva
RD 29 abr 2026