Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Belle J/psi+eta_c anomaly and a very light scalar boson   The large rate of the $J/\psi+\eta_c$ production observed by the Belle
collaboration has posed a serious challenge to our understanding of the
quarkonium. We examine a scenario that there exists a light scalar boson around
5 GeV, with an enhanced coupling solely to the charm quark. Such a scenario
would explain the Belle anomaly. It also predicts a significant increase in
$J/\psi$ plus open charm pair production. An immediate test for the scalar
boson is to look for a peak around 5 GeV in the recoil mass spectrum of
$J/\psi$, because the scalar boson can also be produced in association with the
$J/\psi$. Finally, we also point out that the process $e^+ e^- \to H \gamma$ is
sizable for observation.

17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an