Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rho meson decay in presence of magnetic field   We find a general expression for the one-loop self-energy function of neutral
$\rho$-meson due to $\pi^+\pi^-$ intermediate state in a background magnetic
field, valid for arbitrary magnitudes of the field. The pion propagator used in
this expression is given by Schwinger, which depends on a proper-time
parameter. Restricting to weak fields, we calculate the decay rate
$\Gamma(\rho^0 \rightarrow \pi^+ +\pi^-)$, which changes negligibly from the
vacuum value.

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The categories of this paper are: econ
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: q-bio
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The categories of this paper are: supr-con
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The categories of this paper are: cond-mat
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The categories of this paper are: stat