Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Explanation for Y(4140) and X(3915)   The Y(4140) observed by CDF appears to have a novel explanation. Its mass and
width coincide within experimental error with a two-step process. In the first
step, Y(4140) -> D_sbar + pi + D_s where the pion is virtual. A loop diagram
involving this virtual pion allows Y(4140) de-excitation to J/psi + phi. Its
predicted spin-parity is JPC = 1++. The same mechanism for Dbar-D^*
configurations predicts a similar structure at 3911-3918 MeV, consistent with
the peak at 3915 +- 3 MeV observed in omega J/psi by Babar and Belle. Relative
branching ratios observed for B+ -> phi J/psi K+ and B+ -> omega J/psi K+
require that this mechanism accelerates decays of Y(4140) by a factor ~ 10^4
compared with isospin-violating decays via Y(4140) -> D_sbar + D^*_s. Similar
processes are well known in molecular chemistry.

4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio