Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct CP Violation in Cabibbo-Favored Charmed Meson Decays and
  $\epsilon'/\epsilon$ in $SU(2)_L\times SU(2)_R\times U(1)_{B-L}$ Model   Since the standard model contribution is virtually absent, any observation of
direct CP violation in the Cabibbo-favored charmed meson decays would be
evidence of new physics. In this paper, we conduct a quantitative study on
direct CP violation in $D^0\to K^-\pi^+$, $D_s^+\to \eta\pi^+$ and $D_s^+\to
\eta'\pi^+$ decays in the $SU(2)_L\times SU(2)_R\times U(1)_{B-L}$ gauge
extension of the standard model. In the model, direct CP violation arises
mainly from the interference between the decay amplitude coming from the SM
left-left current operators and that from the right-right current operators
induced by $W_R^+$ gauge boson exchange. Interestingly, the strong phase
between the two amplitudes is evaluable, since it stems from difference in QCD
corrections to the left-left and right-right current operators, which is a
short-distance QCD effect given by
$\sim(\alpha_s(M_{W_L}^2)/4\pi)\log(M_{W_R}^2/M_{W_L}^2)$. We assess the
maximal direct CP violation in the above decays in the $SU(2)_L\times
SU(2)_R\times U(1)_{B-L}$ model. Additionally, we present a correlation between
direct CP violation in these modes and one in $K\to\pi\pi$ decay parametrized
by $\epsilon'$, since $W_R^+$ gauge boson has a sizable impact on the latter.

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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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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: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: supr-con