Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rare $B^-\to\Lambda\bar{p}\nu\bar{\nu}$ decay   We study the four-body semileptonic baryonic decay of $B^-\to \Lambda\bar
p\nu\bar \nu$ in the standard model. We find that the decay branching ratio is
$(7.9\pm 1.9)\times 10^{-7}$. Similar to the rare decays of $B^-\to
K^{(*)-}\nu\bar \nu$, this baryonic decay of $B^-\to \Lambda\bar p\nu\bar \nu$
is also sensitive to new physics and accessible to the future $B$ factories.

17
The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
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The categories of this paper are: econ
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs