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

Abstract

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.

12 pages

References in corpus (6)

• Moments of pseudoscalar meson distribution amplitudes from the lattice
• Measurement of the q2 dependence of the Hadronic Form Factor in D0 --> K- e+ nu_e decays
• A Lattice Computation of the First Moment of the Kaon's Distribution Amplitude
• Extracting |V(ub)| from B->pi l nu Decays Using a Multiply-subtracted Omnes Dispersion Relation
• CKM Physics from Lattice QCD
• Determining the strange quark mass for 2-flavour QCD

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• |V_{cd}|, |V_{cs}| and f_{D_s} from (semi) leptonic $D_{(s)}$-decays : signals of New Physics ?
• Strong phases, asymmetries, and SU(3) symmetry breaking in D --> K pi decays
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• Systematic Study on QCD Interactions of Heavy Mesons with $\rho$ Meson
• Heavy-to-light transition form factors and their relations in light-cone QCD sum rules
• |V_td/V_ts| from QCD Sum Rules on the Light-Cone