Belyaev, V. M. and Braun, Vladimir M. and Khodjamirian, A. and Rückl, R.
D*Dπ and B*Bπ couplings in QCD.
Physical Review D 51 (11), pp. 6177-6195.
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We calculate the D*Dπ and B*Bπ couplings using QCD sum rules on the light cone. In this approach, the large-distance dynamics is incorporated in a set of pion wave functions. We take into account two-particle and three-particle wave functions of twist 2, 3, and 4. The resulting values of the coupling constants are gD*Dπ=12.5±1 and gB*Bπ=29±3. From this we predict the partial width ...
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