Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of time-dependent CP Asymmetries in $B \to D^{*\mp}
  \pi^{\pm}$ decays using a partial reconstruction technique   We report preliminary results on time-dependent CP asymmetries in $B \to
D^{*\mp}\pi^{\pm}$ decays. The CP asymmetry in these decays is proportional to
$2R_{D^{*} \pi} \sin (2\phi_1 + \phi_3 \pm \delta_{D^{*} \pi})$, where
$R_{D^{*} \pi}$ is the ratio of the magnitudes of the doubly-Cabibbo-suppressed
and Cabibbo-favoured amplitudes, $\delta_{D^{*} \pi}$ is the strong phase
difference between them, and $\phi_1$ and $\phi_3$ are two angles of the CKM
Unitarity Triangle. This study is based on a large data sample that contains
657 million $B\bar{B}$ pairs collected with the Belle detector at the KEKB
asymmetric-energy $e^+ e^-$ collider at the $\Upsilon(4S)$ resonance. We use a
partial reconstruction technique, wherein signal $B \to D^{*\mp}\pi^{\pm}$
events are identified using information only from the $\pi^{\pm}$ from the $B$
decay and the charged slow pion from the subsequent decay of the $D^{*-}$. We
obtain
  $S^+ (D^* \pi) = +0.057 \pm 0.019(\mathrm{stat}) \pm 0.012(\mathrm{sys})$ and
  $S^- (D^* \pi) = +0.038 \pm 0.020(\mathrm{stat}) \pm 0.010(\mathrm{sys})$.

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The categories of this paper are: q-bio
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The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys