Testing QCD Sum Rules on the Light-Cone in D->(pi,K) l nu Decays

Details Testing QCD Sum Rules on the Light-Cone in D->(pi,K) l nu Decays Testing QCD Sum Rules on the Light-Cone in D->(pi,K) l nu Decays

2006-08-10

arxiv.org/abs/hep-ph/0608116v1

Phys.Lett.B641:50-56,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages

Scientific paper

10.1016/j.physletb.2006.08.038

We compare the predictions for the form factors f_+^{D->pi,K}(0) from QCD sum rules on the light-cone with recent experimental results. We find f_+^{D->pi}(0) = 0.63\pm 0.11, f_+^{D->K}(0) = 0.75\pm 0.12 and f_+^{D->pi}(0)/f_+^{D->K}(0)= 0.84\pm 0.04 in very good agreement with experiment. Although the uncertainties of the form factors themselves are larger than the current experimental errors and difficult to reduce, their ratio is determined much more accurately and with an accuracy that matches that of experiment.

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