We explore the decay of a vector meson to two pseudoscalar mesons on the lattice with N f = 2 flavours of sea quark. Although we are working with quark masses that do not allow a physical decay, we show how the transition rate can be evaluated from the amplitude for ρ → ππ and from the annihilation component of ππ → ππ. We explore the decay amplitude for two different pion momenta and find cons...

We report results on a lattice calculation of the heavy-light meson decay constant employing the non-relativistic QCD approach for heavy quark and Wilson action for light quark. Simulations are carried out at β = 6.0 on a 16 × 48 lattice. Signal to noise ratio for the ground state is significantly improved compared to simulations in the static approximation, enabling us to extract the decay con...

Non-factorizable effects on the color-suppressed B → D(∗)π decay modes are analyzed. Recent observations of B̄0 → D(∗)0π0 by Belle and CLEO strongly suggest that there exists a non-zero strong phase difference between colorallowed and color-suppressed decay modes, and the factorization parameter a2 associated with the color-suppressed decay mode is process dependent. In the heavy quark limit whe...

The top quark, discovered at the FERMILAB TEVATRON collider in 1995, is the heaviest known elementary particle. Today, ten years later, still relatively little is known about its properties. The strong and weak interactions of the top quark are not nearly as well studied as those of the other quarks and leptons. The strong interaction is most directly measured in top quark pair production. The ...

Some recent developments in heavy quark theory are reviewed. Particular emphasis is given to inclusive weak decays of hadrons containing a b quark. The isospin violating hadronic decay D s ! Ds 0 is also discussed.

Assuming the D̄, D, D s and B , B, B s mesons belong to triplets of SU(3) flavor symmetry, we analyse the form factors in the semileptonic decays of these mesons. Both quark and meson mass differences are taken into account. We find a number of relations, in agreement with the present data as well as with previous analyses, and predict certain ratios of form factors, not yet measured, most notab...

Mesonic baryon resonance decays are calclulated from constituent quark models along a Poincaré-invariant generalization of the elementary emission model. Covariant results of pionic decay widths are presented for the Goldstone-boson-exchange constituent quark model.

Over a large fraction of phase space a combination of an operator product and heavy quark expansions effectively turn the decay B̄ → D(∗)0e+e− into a “short distance” process, i.e., one in which the weak and electromagnetic interactions occur through single local operators. These processes have an underlying W-exchange quark diagram topology and are therefore Cabibbo allowed but suppressed by co...

We calculate the radiative corrections to the nonleptonic inclusive B decay mode b → cūd taking into account the charm quark mass. Compared to the massless case, corrections resulting from a nonvanishing c quark mass increase the nonleptonic rate by (4–8)%, depending on the renormalization point. As a by–product of our calculation, we obtain an analytic expression for the radiative correction t...