Study of $\mathbf{\boldsymbol{D \rightarrow a_0 (980) e^+ \nu_e}}$ decay in the light-cone sum rules approach

  title={Study of \$\mathbf\{\boldsymbol\{D \rightarrow a\_0 (980) e^+ \nu\_e\}\}\$ decay in the light-cone sum rules approach},
  author={Xiao-Dong Cheng and Hai-bo Li and Bin Wei and Yu-Guo Xu and Mao-Zhi Yang},
  journal={Physical Review D},
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… 
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