RT Journal Article
T1 Color coherence in a heavy quark antenna radiating gluons inside a QCD medium
A1 Rodríguez Calvo, Manoel
A1 Rodríguez-Moldes Díaz, Manoel Anxo
A1 Salgado López, Carlos Alberto
K1 Perturbative QCD
K1 Jet quenching
K1 Heavy quarks
AB We compute the color coherence effects for soft gluon radiation off antennas containing heavy quarks in the presence of a QCD medium – the actual calculations is made for a triplet configuration and then generalize to both color singlet and octet ones. This work completes the studies of antenna radiation inside a medium which provide a useful picture of the relevance of interference effects in jet parton showers for the jet quenching phenomenon observed in high-energy nuclear collisions. The analysis is performed resumming the multiple scatterings of the partonic system with the medium. The main conclusion is that decorrelation due to color rotation is more effective in the case in which at least one of the emitters of the antenna is a heavy quark. This effect, present both for a heavy-quark–antiquark or a heavy-quark–gluon antenna is more relevant for the later or for the case in which the energies of the quark and antiquark are very different. The parameter controlling these effects involves the dead-cone angle. We find that interferences are cancelled, spoiling the color correlation of the pair, when θDC≡M/E 1/√ωLwhere Eand ωare the energies of the heavy quark and the radiated gluon and Lis the medium length. In the case of a heavy-quark–antiquark antenna tform, defined as the difference in splitting times in amplitude and complex conjugate of the amplitude, appears instead of Lif the original splitting is symmetric. The presence or absence of interferences modifies the energy loss pattern
PB Elsevier
SN 0370-2693
YR 2014
FD 2014
LK http://hdl.handle.net/10347/21370
UL http://hdl.handle.net/10347/21370
LA eng
NO Calvo, M., Moldes, M. and Salgado, C., 2014. Color coherence in a heavy quark antenna radiating gluons inside a QCD medium. Physics Letters B, 738, 448-452
NO This work is supported by European Research Council grant HotLHC ERC-2011-StG-279579, by Xunta de Galicia (Consellería de Educación); by the Spanish Consolider-Ingenio 2010 Programme CPAN and by FEDER. Manoel R. Calvo thanks Ministerio de Ciencia e Innovación of Spain for financial support under grant FPI-BES-2010-040744
DS Minerva
RD 28 abr 2026