Raktim Abir, Carsten Greiner, Mauricio Martinez, Munshi G. Mustafa, Jan Uphoff
An improved generalized suppression factor for gluon emission off a heavy
quark is derived within perturbative QCD, which is valid for the full range of
rapidity of the radiated gluon and also has no restriction on the scaled mass
of the quark with its energy. In the appropriate limit it correctly reproduces
the usual dead cone factor in the forward rapidity region. On the other hand,
this improved suppression factor becomes close to unity in the backward
direction. This indicates a small suppression of gluon emission in the backward
region, which should have an impact on the phenomenology of heavy quark energy
loss in the hot and dense matter produced in ultra-relativistic heavy-ion
collisions.
View original:
http://arxiv.org/abs/1109.5539
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