Robert Fleischer

Limitations in measuring the angle β by using SU(3) relations for B-meson decay-amplitudes☆

Abstract Flavour SU (3) symmetry of strong interactions and certain dynamical assumptions have been used in a series of recent publications to extract weak CKM phases from B -decays into {ππ, πK, K K } final states. We point out that irrespectively of SU (3)-breaking effects the presence of QCD-penguin contributions with internal u - and c -quarks precludes a clean determination of the angle β in the unitarity triangle by using the branching ratios only. This difficulty can be overcome by measuring in addition the ratio x d / x s of B d 0 − B d 0 to B s 0 − B s 0 mixings. The measurement of the angle γ is unaffected by these new contributions. Some specific uncertainties related to SU (3)-breaking effects and electroweak penguin contributions are briefly discussed.

Electroweak penguin effects beyond leading logarithms in theB-meson decaysB−→K− ϕ and\(B^ - \to \pi ^ - \bar K^{0*} \)

AbstractUsing the low energy effective Hamiltonian for |ΔB|=1, ΔC=ΔU=0 transitions, which has been calculated recently by Buras et al. beyond the leading logarithmic approximation, we analyze the penguin-inducedB-meson decaysB−→K− ϕ andn

Search for the angle γ in the electroweak penguin dominated decay Bs→π0Φ

B^ - to pi ^ - bar K^{0*}

Mixing-induced CP violation in the decay Bd→K0 K̄0 within the standard model

n within the framework of the Bauer-Stech-Wirbel model and find, in contradiction to naïve expectations, that the decay modeB−→K− ϕ is affected strongly by electroweak penguin operators. Thes contributions depend on the value of the top-quark mass and reduce the branching ratio BR(B−→K− ϕ) by factors of 0.8 ... 0.6 formt=(130... 250) GeV, respectively, relative to the results obtained by taking into account only QCD penguin operator contributions. On the other hand, we find that the effects of the electroweak penguins are very small for the transitionn

Chiral logarithmic corrections to heavy to light semileptonic decays of the type H→πev

B^ - to pi ^ - bar K^{0*}

Constraints on the CKM Angle γ and Strong Phases from B ! πK Decays

n.