The determination of the angle γ of the unitarity triangle of the CKM matrix is regarded as a challenge for future B-physics experiments. In this context, the decays B ± → π ± K and B d → π ∓ K ± , which were observed by the CLEO collaboration last year, received a lot of interest in the literature. After a general parametrization of their decay amplitudes , strategies to constrain and determin...

The decays B → πK and Bd → πK were observed by the CLEO collaboration last year; they may play an important role to probe the angle γ of the unitarity triangle of the CKM matrix. After a general parametrization of their decay amplitudes within the Standard Model, strategies to constrain and determine the CKM angle γ with the help of the corresponding CP-conserving and CP-violating observables a...

Electroweak penguin (EWP) amplitudes are studied model-independently in B meson decays to charmless final states consisting of a vector meson (V ) and a pseudoscalar meson (P ). A set of SU(3) relations is derived between EWP contributions and tree amplitudes, in the approximation of retaining only the dominant EWP operators Q9 and Q10 . Two applications are described for constraining the weak ...

Electroweak penguin (EWP) amplitudes are studied model-independently in B meson decays to charmless final states consisting of a vector meson (V ) and a pseudoscalar meson (P ). A set of SU(3) relations is derived between EWP contributions and tree amplitudes, in the approximation of retaining only the dominant EWP operators Q9 and Q10. Two applications are described for constraining the weak p...

Recent results from CLEO on B → Kπ indicate that the phase γ may be substantially different from that obtained from other fit to the KM matrix elements in the Standard Model. We show that γ extracted usingB → Kπ, ππ is sensitive to new physics occurring at loop level. It provides a powerful method to probe new physics in electroweak penguin interactions. Using effects due to anomalous gauge cou...

We study the penguin induced transition b → s γ in the minimal N=1 supersymmetric extension of the Standard Model with radiative breaking of the electroweak group. We include the effects of one-loop corrections to the Higgs potential and scalar masses. We show that the present upper and lower experimental limits on the inclusive decay sharply constrain the parameter space of the model in a wide...

Latest data on charmless strange vector-pseudoscalar B decays now including B → ρK confirm a simple penguin model in which the gluon G in an initial s̄uG state fragments equally into uū, dd̄ and ss̄ and all form factors are equal. A search for possible additional contributions shows only a few signals not obscured by experimental errors whose implications are discussed. The experimental value of 0...

This paper presents the latest results from experiment E787, at Brookhaven National Laboratory, on K + → π + νν and radiative K + decays. The result for K + → π + νν uses data collected in runs taken during 1995, 1996 and 1997. In addition, we discuss plans for future measurements of K + → π + νν. This decay mode is a very clean probe of the dynamics of the Cabbibo-Kobayashi-Maskawa (CKM) mixin...