Search for D + 4 p + + Decay , and the Pseudoscalar Decay Constant f ’ *

NEW RESULTS ON CHARMED D, @AND F’PRODUCTION AND DECAY FROM THE MARK IIIt

Results on charmed meson production and decay are presented from the Mark III at SPEAR. FE’ sssociated production is observed allowing a direct measurement of the F’mass. A search for the decay D+ + r+u,, in the recoil of hadronically tagged D* decays provides a stringent limit on the pseudoscalar decay constant jo . New results on DoDo mixing from semileptonic Do decays and evidence for a nonr...

Charged Higgs and Scalar Couplings in Semileptonic Meson Decay

We present a new charged Higgs search technique using the effects of scalar dynamics in semileptonic meson decay. Applying this method to a modest sample of B meson decays yields sensitivity to the high tan β region well beyond existing charged Higgs searches. Past searches for charged Higgs can be put into four categories: 1) direct production in colliders, 2) measurement of anomalously large ...

Decay Constant of Pseudoscalar Meson in the Heavy Mass Limit

The leptonic decay constant of the pseudoscalar mesons a calculated by use of the relativistic constituent quark model constructed on the point form of Poincare-covariant quantum mechanics. We discuss the role relativistic corrections for decay constants of pseudoscalar mesons with heavy quarks. We consider the heavy mass limit of decay constant for two-particle system with equal masses. Decay ...

Improved measurement of the pseudoscalar decay constant fDs

M ar 1 99 7 Decay Constant Ratios f η c / f J / ψ and f η b / f Υ

We calculate the decay constant ratios fηc/fJ/ψ and fηb/fΥ. In the calculation we take into account the mock meson structures of the mesons, as well as the difference of the wave functions at origin of the vector and pseudoscalar mesons studied by Ahmady and Mendel. We find that the different spin structures of the mesons much affect the ratios. We incorporate our results in the prediction of t...