Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of $\mathbf{\boldsymbol{D \rightarrow a_0 (980) e^+ \nu_e}}$ decay
  in the light-cone sum rules approach   Within the QCD light-cone sum rule (LCSR) approach, we investigate the
transition form factors of $D\rightarrow a_0(980)$ up to the twist-3 light-cone
distribution amplitudes (LCDAs) of the scalar meson $a_0(980)$ in the two-quark
picture. Using these form factors, we calculate the differential decay widths
and branching ratios of the $D\rightarrow a_0(980) e^+ \nu_e$ semileptonic
decays. We obtain ${\mathcal B}(D^0\rightarrow a_0^- (980) e^+
\nu_e)=(4.08^{+1.37}_{-1.22})\times 10^{-4}$ and ${\mathcal B}(D^+\rightarrow
a_0^0 (980) e^+ \nu_e)=(5.40^{+1.78}_{-1.59})\times 10^{-4}$. The results are
sensitive to the $a_0(980)$ inner structure. These decays can be searched for
at BESIII experiment, and any experimental observations will be useful to
identify internal quark contents of the $a_0(980)$ meson, which will shed light
on understanding theoretical models.

22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess