Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast})$ with a
  semileptonic tagging method   We report a measurement of the ratios of branching fractions $\mathcal{R}(D)
= {\cal B}(\bar{B} \to D \tau^- \bar{\nu}_{\tau})/{\cal B}(\bar{B} \to D \ell^-
\bar{\nu}_{\ell})$ and $\mathcal{R}(D^{\ast}) = {\cal B}(\bar{B} \to D^* \tau^-
\bar{\nu}_{\tau})/{\cal B}(\bar{B} \to D^* \ell^- \bar{\nu}_{\ell})$, where
$\ell$ denotes an electron or a muon. The results are based on a data sample
containing $772\times10^6$ $B\bar{B}$ events recorded at the $\Upsilon(4S)$
resonance with the Belle detector at the KEKB $e^+ e^-$ collider. The analysis
utilizes a method where the tag-side $B$ meson is reconstructed in a
semileptonic decay mode, and the signal-side $\tau$ is reconstructed in a
purely leptonic decay. The measured values are $\mathcal{R}(D)= 0.307 \pm 0.037
\pm 0.016$ and $\mathcal{R}(D^{\ast})= 0.283 \pm 0.018 \pm 0.014$, where the
first uncertainties are statistical and the second are systematic. These
results are in agreement with the Standard Model predictions within $0.2$ and
$1.1$ standard deviations, respectively, while their combination agrees with
the Standard Model predictions within $1.2$ standard deviations.

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The categories of this paper are: eess
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The categories of this paper are: econ
36
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: math
7
The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: adap-org