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Journals and Conferences
The main goal of todays B physics is a precision study of the flavour sector and the phenomenon of CP violation that comes along with it. Particularly useful for clean tests of the Standard Model are the rare radiative b → s(d)γ transitions. The inclusive b → sγ mode was measured to have a branching fraction of B(B → Xsγ) = (3.23 ± 0.42) · 10. Branching… (More)
We provide a model-independent framework for the analysis of the radiative B-meson decays B → Kγ and B → ργ. In particular, we give a systematic discussion of the various contributions to these exclusive processes based on the heavy-quark limit of QCD. We propose a novel factorization formula for the consistent treatment of B → V γ matrix elements involving… (More)
We analyze the double radiative B-meson decays Bs → γγ and Bd → γγ in QCD factorization based on the heavy-quark limit mb ≫ ΛQCD. We systematically discuss the various contributions to these exclusive processes. The dominant effect arises from the magnetic-moment type transition b → s(d)γ where an additional photon is emitted from the light quark… (More)
Using methods of effective field theory, factorized expressions for arbitrary B̄ → Xu l−ν̄ decay distributions in the shape-function region of large hadronic energy and moderate hadronic invariant mass are derived. Large logarithms are resummed at next-to-leading order in renormalization-group improved perturbation theory. The operator product expansion is… (More)
The contributions of subleading shape functions to inclusive decay distributions of B mesons are derived from a systematic two-step matching of QCD current correlators onto soft-collinear and heavy-quark effective theory. At tree-level, the results can be expressed in terms of forward matrix elements of bi-local light-cone operators. Fourquark operators,… (More)
A new method for a precision measurement of the Cabibbo-Kobayashi-Maskawa matrix element |V(ub)| is discussed, which combines good theoretical control with high efficiency and a powerful discrimination against charm background. The resulting combined theoretical uncertainty on |V(ub)| is estimated to be 10%.
We apply Soft-Collinear Effective Theory to prove at leading power in ΛQCD/mb a factorization formula for the radiative leptonic decay B → γlν. Large logarithms entering the hard-scattering kernel are systematically resummed by a two-step perturbative matching procedure.
Flavour physics is at the moment the most active field of elementary particle physics. In particular the dedicated B-physics experiments BaBar and Belle produce a wealth of data which allows for a determination of fundamental parameters of the Standard Model with unprecedented accuracy. Flavour physics and CP violation are governed by the… (More)
We discuss the exclusive radiative B-meson decays B → K∗γ and B → ργ in a modelindependent manner. The analysis is based on the heavy-quark limit of QCD. This allows a factorization of perturbatively calculable contributions to the B →V γ matrix elements from non-perturbative form factors and universal light-cone distribution amplitudes. These results allow… (More)