Decay constants of the B and D mesons from QCD-duality sum rules
Abstract
We show that various (non-) relativistic versions of QCD duality sum rules lead to a unique prediction ƒ;b ⋍ (1.38 +/- 0.14) ƒ;π for the decay constant of the pseudoscalar B-meson. We also obtain ƒ;D ⋍(1.31 +/- 0.12) ƒ;π from relativistic Laplace (Borel) sum rules and show that the SU (3)F-breaking effects tend to increase the decay corresponding of the corresponding mesons containing a strange quark. In view of our results, we re-examine some qualitative arguments predicting the mass behaviour of the decay constant of heavy-light quark bound states.
- Publication:
-
Physics Letters B
- Pub Date:
- November 1987
- DOI:
- 10.1016/0370-2693(87)90168-7
- Bibcode:
- 1987PhLB..198..104N