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In this paper, the D→Klv~l decay is researched using by QCD light cone sum rules. Firstly, the form factor of D→K is calculated by choosing a new correlative function to eliminate the effect caused by the uncertainty of twist-3 function, so the calculation result of form factor is more precise, and the branching ratio is consistent with the experimental data.
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Keywords:
- QCD light cone sum rules /
- D semileptonic decay /
- branching ratio /
- form factor
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