Form factor relations for heavy-to-light meson transitions: tests of the Quark Model predictions

Details Form factor relations for heavy-to-light meson transitions: tests of the Quark Model predictions Form factor relations for heavy-to-light meson transitions: tests of the Quark Model predictions

1998-10-20

arxiv.org/abs/hep-ph/9810421v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, Latex, submitted to Phys. Rev. D (Oct. 1998)

Scientific paper

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.

Affiliated with

Also associated with

No associations

Rating

Form factor relations for heavy-to-light meson transitions: tests of the Quark Model predictions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Form factor relations for heavy-to-light meson transitions: tests of the Quark Model predictions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Form factor relations for heavy-to-light meson transitions: tests of the Quark Model predictions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-373392