Note on helicity amplitudes in D to V semileptonic decays

Details Note on helicity amplitudes in D to V semileptonic decays Note on helicity amplitudes in D to V semileptonic decays

2006-01-04

arxiv.org/abs/hep-ph/0601028v1

Phys.Rev.D73:057503,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 5 figures

Scientific paper

10.1103/PhysRevD.73.057503

Motivated by the recent extraction of the helicity amplitudes for the D+ -> K*0bar mu+ nu decay, done by the FOCUS collaboration, we determine helicity amplitudes for the D+ -> K*0bar l nu, D+ -> rho0 l nu and Ds -> phi l nu semileptonic decays using the knowledge of the relevant form factors. The vector and axial form factors for D -> V l nu decays are parameterized by including contributions of charm meson resonances and using the HQET and SCET limits. In the case that the vector form factor receives contributions from two poles while axial form factors are dominated by a single pole for D+ -> K*0bar l nu, we obtain better agreement with the experimental result then when all of them are dominated by single poles.

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