Abstract
We calculate the transition form factors within the framework of the light-cone QCD sum rules (LCSR) with the D-meson light-cone distribution amplitudes (LCDAs). The next-to-leading power (NLP) corrections to the vacuum-to-D-meson correlation function are considered, and the NLP corrections from the high-twist D-meson LCDAs and the SU(3) breaking effect from a strange quark mass are investigated. Adopting the exponential model of the D-meson LCDAs, the SU(3) flavor symmetry breaking effects are predicted as and , respectively, confirming the results obtained from LCSR with pion LCDA. The numerical predictions of the form factors show that the contribution from two-particle higher-twist contributions is of great importance and the uncertainties are dominated by the inverse moment of . With the obtained form factors, the predicted Cabibbo-Kobayashi-Maskawa (CKM) matrix elements are and .
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