Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Branching fractions and direct CP asymmetries of charmless decay modes
  at the Tevatron   We present new CDF results on the branching fractions and time-integrated
direct CP asymmetries for $B^{0}$ and $B^{0}_{s}$ decay modes into pairs of
charmless charged hadrons (pion or kaon). The data set for this update amounts
to 1 fb$^{-1}$ of $\bar{p}p$ collisions at $\sqrt{s}=1.96 \rm{TeV}$. We report
the first observation of the $B^{0}_{s} \to K^{-}\pi^{+}$ mode and a
measurement of its branching fraction and direct CP asymmetry. We also observe
for the first time two charmless decays of $b$-baryon: $\Lambda^{0}_{b} \to
p\pi^{-}$ and $\Lambda^{0}_{b} \to pK^{-}$.

32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
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The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph