Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on the new particle in $\Sigma^+\to p\mu^+\mu^-$   The HyperCP collaboration has presented the branching ratio of $\Sigma^+\to
p\mu^+\mu^-$ to be $(8.6^{+6.6}_{-5.4}\pm 5.5)\times 10^{-8}$ and suggested a
new boson $P^0$ with a mass of $214.3\pm 0.5$ MeV to induce the flavor changing
transition of $s\to d\mu^+\mu^-$. We demonstrate that to explain the data, the
new particle cannot be a scalar but pseudoscalar based on the direct
constraints from $K^+\to\pi^+\mu^+\mu^-$ and $K_L\to\mu^+\mu^-$, respectively.
Moreover, we determine that the decay width of the pseudoscalar should be in
the range of $10^{-7}$ MeV with the lifetime of $10^{-14}$ sec.

27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph