Ca. Dominguez et al., SPECTRAL FUNCTIONS FOR HEAVY LIGHT CURRENTS AND FORM-FACTOR RELATIONSIN HQET, Physics letters. Section B, 309(1-2), 1993, pp. 152-156
We derive relations among form factors describing the current-induced
transitions: (vacuum) --> B, B, Bpi, B*pi, Brho and B * rho using hea
vy quark symmetry. The results are compared to corresponding form fact
or relations following from identities between scalar and axial vector
, and pseudoscalar and vector spectral functions in the heavy quark li
mit.