Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of ${\cal B}(\bar{B}^0 \to \Lambda_{c}^{+} \bar{p})$ and
  ${\cal B}(B^- \to \Lambda_{c}^{+} \bar{p} \pi^-)$ and Studies of
  $\Lambda_{c}^{+}\pi^-$ Resonances   We present an investigation of the decays $\bar{B}^0 \to \Lambda_{c}^{+}
\bar{p}$ and $B^- \to \Lambda_{c}^{+} \bar{p} \pi^-$ based on $383\times10^6$
$\Upsilon(4S) \to B\bar{B}$ decays recorded with the BABAR detector. We measure
the branching fractions of these decays; their ratio is ${\cal B}(B^- \to
\Lambda_{c}^{+} \bar{p} \pi^-) / {\cal B}(\bar{B}^0 \to \Lambda_{c}^{+}
\bar{p}) = 15.4 \pm 1.8 \pm 0.3$. The $B^- \to \Lambda_{c}^{+} \bar{p} \pi^-$
process exhibits an enhancement at the $\Lambda_{c}^{+} \bar{p}$ threshold and
is a laboratory for searches for excited charm baryon states. We observe the
resonant decays $\bar{B}^- \to \Sigma_{c}(2455)^{0} \bar{p}$ and $B^- \to
\Sigma_{c}(2800)^{0} \bar{p}$ but see no evidence for $B^- \to
\Sigma_{c}(2520)^{0} \baver{p}$. This is the first observation of the decay
$B^- \to \Sigma_{c}(2800)^{0} \bar{p}$; however, the mass of the observed
excited $\Sigma_{c}^{0}$ state is $(2846\pm8\pm10)MeV/c^2$, which is somewhat
inconsistent with previous measurements. Finally, we examine the angular
distribution of the $B^- \to \Sigma_{c}(2455)^{0} \bar{p}$ decays and measure
the spin of the $\Sigma_{c}(2455)^{0}$ baryon to be 1/2, as predicted by the
quark model.

23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
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The categories of this paper are: math-ph