Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interference effects in medium-induced gluon radiation   As a step towards understanding the in-medium evolution of a hard jet, we
consider the interference pattern for the medium induced gluon radiation
produced by a color singlet quark-antiquark antenna embedded in a QCD medium
with size L. We focus on the typical kinematics for medium-induced gluon
radiation in the BDMPS-Z regime, that is, short formation times \tau_f << L and
relatively large emission angles \theta >>\theta_c = 2/\sqrt{\hat q L^3}, with
\hat q the `jet quenching' parameter. We demonstrate that, for a dipole opening
angle \theta_{q\bar q} larger than \theta_c, the interference between the
medium-induced gluon emissions by the quark and the antiquark is parametrically
suppressed with respect to the corresponding direct emissions. Physically, this
is so since the direct emissions can be delocalized anywhere throughout the
medium and thus yield contributions proportional to L. On the contrary, the
interference occurs only between gluons emitted at very early times, within the
characteristic time scales for quantum and color coherence between the two
emitters, which in this regime are much smaller than L. This implies that, for
\theta_{q\bar q} >> \theta_c, the medium-induced radiation by the dipole is
simply the sum of the two BDMPS-Z spectra individually produced by the quark
and the antiquark, without coherence effects like angular ordering. For
\theta_{q\bar q} << \theta_c, the BDMPS-Z radiation by the dipole vanishes.

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The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: q-alg
16
The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph