Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiative Leptonic $B_c\to \gamma \ell\bar\nu$ Decay in Effective Field
  Theory beyond Leading Order   We study the radiative leptonic $B_c\to \gamma\ell\bar\nu$ decays in the
nonrelativistic QCD effective field theory, and consider a fast-moving photon.
As a result the interactions with the heavy quarks can be integrated out, and
thus we arrive at a factorization formula for the decay amplitude. We calculate
not only the relevant short-distance coefficients at leading order and
next-to-leading order in $\alpha_s$, but also the nonrelativistic corrections
at the order $|\bold{v}|^2$ in our analysis. We find out that the QCD
corrections can sizably decrease the branching ratio and thus is of great
importance in extracting the long-distance operator matrix elements of $B_c$.
For the phenomenological application, we present our results for the photon
energy, lepton energy and lepton-neutrino invariant mass distribution.

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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio