Form factors in B->f0(980) and D->f0(980) transitions from dispersion   relations
  Within the dispersion relation approach we give the double spectral representation for space-like and time-like B-> f_0(980) and D-> f_0(980) transition form factors in the full q^2 range. The spectral densities, being the input of the dispersion relations, are obtained from a triangle diagram in the relativistic quark model. 
B. El-Bennich, O.M.A. Leitner, B. Loiseau and J.-P. Dedonder