Measurement of the pseudoscalar decay constantfDsusingDs+→τ+ν,τ+→ρ+ν¯decays

Measurement of the Pseudoscalar Decay Constant

Improved measurement of the pseudoscalar decay constant fDs

Direct measurement of the pseudoscalar decay constant, fDs.

J.Z. Bai, 1 0. Bardon,6 1. Blum,11 A. Breakstone,9 T. Bumett, 12 G.P. Chen, 1 H. F. Chen,4 J. Chen,5 S.J. Chen, 1 S.M. Chen, 1 Y. Chen, 1 Y.B. Chen, 1 Y.Q. Chen, 1 B.S. Cheng,1 R.F. Cowan,6 H. C. Cui, 1 X.Z. CuV H.L. Ding,1 Z.Z. Du, 1 W. Dunwoodie,8 X.L. Fan, 1 J. Fang, 1 M. Fero,6 C.S. Gao, 1 M.L. Gao,1 S.Q. Gao,1 W.X. Gao, 1 P. Gratton, 11 J.H. Gu, 1 S.D. Gu, 1 W.X. Gu, 1 Y.F. Gu, 1 Y.N. Guo,...

Leptonic and Semileptonic Decays of Pseudoscalar Mesons

We employ the relativistic constituent quark model to give a unified description of the leptonic and semileptonic decays of pseudoscalar mesons (π, K, D, Ds, B, Bs). The calculated leptonic decay constants and form factors are found to be in good agreement with available experimental data and other approaches. We reproduce the results of spin-flavor symmetry in the heavy quark limit.

Semileptonic decays of heavy-light pseudoscalar mesons

I discuss the results of a recent quenched lattice calculation of the two independent form factors parametrizing the semileptonic decays between heavy-light pseudoscalar mesons. The differential decay rate of the process B → Dℓν has been calculated at non vanishing momentum transfer both in the case of the light leptons ℓ = e, µ and in the case of a non vanishing lepton mass ℓ = τ.