Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the inclusive B_s^0 -> X^+ l^- \nu semileptonic decay
  branching fraction   Inclusive semileptonic B_s^0 -> X^+ l^- \nu decays are studied for the first
time using a 23.6 fb^{-1} data sample collected on the Y(5S) resonance with the
Belle detector at the KEKB asymmetric energy e^+ e^- collider. These decays are
identified by the means of a lepton accompanied by a same-sign D_s^+ meson
originating from the other B_s^0 in the event. The semileptonic branching
fractions are measured in the electron and muon channels to be Bf(B_s^0 -> X^+
e^- \nu) = (10.9 \pm 1.0 \pm 0.9)% and Bf(B_s^0 -> X^+ \mu^- \nu) = (9.2 \pm
1.0 \pm 0.8)%, respectively. Assuming an equal electron and muon production
rate in B_s^0 decays, a combined fit yields an average leptonic branching
fraction Bf(B_s^0 -> X^+ l^- \nu) = (10.2 \pm 0.8 \pm 0.9)%.

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The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg