We report improved measurements of branching fraction and decay constant f D + in D + → µ + ν using 281 pb −1 of data taken on the ψ(3770) resonance with the CLEO-c detector. We extract a relatively precise value for the decay constant of the D + meson by measuring B(D + → µ + ν) =

We are interested in the behavior of the Fourier transform of measures with finite energy. It is easy to see that Iα(μ) <∞ does not imply any pointwise decay of |μ̂(ξ)| as |ξ| → ∞. However, in general, averages of μ̂(ξ) behave much better. Let Γ be a smooth submanifold of Rd and let νΓ be a smooth surface measure on Γ. One may ask the following general question: Fix α ∈ (0, d), and assume that Iα...

2 Background 5 Materials and Methods 10 Results 15 Discussion 26 Appendix 31 Bibliography 32 Acknowledgements 35

TAUDECAY is a library of helicity amplitudes to simulate polarized tau decays, constructed in the FEYNRULES and MADGRAPH5 framework. Together with the leptonic mode, the decay library includes the main hadronic modes, τ → ντ + π , 2π , and 3π , which are introduced as effective vertices by using FEYNRULES. The model file allows us to simulate tau decays when the on-shell tau production is kinem...

We calculate the radiative corrections to the decays τ → Mντ and π → lνl, where the meson M is M = π or K and the lepton l is l = e or μ. We perform a complete calculation, which includes internal bremsstrahlung and structure dependent radiation in the radiative decays and point meson, hadronic structure dependent and short distance contributions in the virtual corrections. Our result for the r...

Recent work in light flavour hadron physics is reviewed. In particular, I discuss the significance of the progress achieved with light dynamical quarks on the lattice for the effective low energy theory of QCD. Also, I draw attention to some puzzling results from NA48 and KTeV concerning the scalar form factor relevant for Kμ3 decay – taken at face value, these indicate physics beyond the Stand...

We point out that supergravity effects enable the inflaton to decay into all matter fields, including the visible and the supersymmetry breaking sectors, once the inflaton acquires a non-vanishing vacuum expectation value. The new decay processes have great impacts on cosmology; the reheating temperature is bounded below; the gravitinos are produced by the inflaton decay in a broad class of the...

The investigation of mixing phenomena and lifetime in neutral B meson systems provides an important testing ground for standard model flavour dynamics. Spectroscopic parameters has been used to calculate the pseudoscalar decay constant and predictions of mixing mass parameters and lifetimes of the Bd and Bs mesons.

We consider the upward-going muon flux due to the WIMP annihilations in the cores of the sun and the earth, including the upper bound on the branching ratio for Bs → μμ decay. We find that the constraint from Bs → μμ is very strong in most parameter space, and exclude the supergravity parameter space regions where the expected upward-going muon fluxes are within the expected reach of AMANDA II.

Two body weak processes ΛN ↔ NN are studied from the viewpoint of quark substructure of baryons. They can be studied in nonmesonic weak decays of hypernuclei and also hyperon production in the NN scattering. The direct quark mechanism in contrast to the one-pion exchange mechanism is shown to give sizable ∆I = 3/2 contribution in the J = 0 channel. Nonmesonic decay rates of 4ΛH, 4 ΛHe, and 5 ΛH...