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- W2963042001 abstract "In the case of heavy-to-light weak meson transitions, a Quark Model derivation leads to very general relations between the form factors that parametrize the hadronic matrix elements. We investigate to what extent these form factor relations remain a good approximation, beyond the Quark Model. In heavy-to-light pseudoscalar-to-vector meson transitions, a simple argument shows that the V-A structure of the weak interaction leads to a strong suppression of the helicity h=+1 amplitude - an effect that has been confirmed experimentally by the CLEO Collaboration, with a full angular analysis of the B -> K* J/psi decay. We show that the theoretical predictions, in terms of the hadronic form factors, can accommodate the suppression of the h=+1 amplitude, only if the Quark Model relations are verified. Moreover, the form factor relations also allow us to predict the ratio of the two remaining helicity amplitudes, with h=0 and h=-1; here too, there is excellent agreement with the CLEO data for the B -> K* J/psi decay. In the future, similar experimental tests can be carried out, with a few advantages, using the semileptonic decay B -> rho l- nu_l. The Quark Model relations can also be tested against the predictions for the hadronic form factors, from the more powerful theoretical methods of Lattice QCD and Light Cone Sum-Rules. The excellent agreement points once again to the validity of the form factor relations, beyond the Quark Model framework where they were derived." @default.
- W2963042001 created "2019-07-30" @default.
- W2963042001 creator A5089347630 @default.
- W2963042001 date "1998-01-01" @default.
- W2963042001 modified "2023-09-28" @default.
- W2963042001 title "Form-factor relations for heavy to light meson transitions: Tests of the quark model predictions" @default.
- W2963042001 hasPublicationYear "1998" @default.
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