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Within the QCD light-cone sum rule (LCSR) approach, we investigate the transition form factors of D → 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 → a 0 (980)e + ν e semileptonic decays. We obtain B(D 0 → a 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.

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Recently, the Belle collaboration reported the first measurement of the τ lepton polarization P τ (D * ) in B D*t n 