Wuppertal 2015 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 57: Flavourphysik 2 (Theorie)

T 57.1: Vortrag

Dienstag, 10. März 2015, 16:45–17:00, K.12.16 (K4)

Towards the new frontier in non-leptonic three-body B-decays — •Susanne Kränkl, Thomas Mannel, and Javier Virto — Universität Siegen

Dalitz plot analyses of non-leptonic three-body B decays such as B→ πππ, are interesting for a number of phenomenological applications like the extraction of the CKM angle α and the determination of CP asymmetries. Previous studies used explicit models for the resonant contributions of the three-body phase space. In contrast, we carry out a model-independent analysis of the B→ πππ Dalitz plots within the framework of QCD factorization. We identify the relevant theoretical description in the different regions of the phase space and reconstruct the Dalitz plot by a merging of the descriptions in those regions. Resonant contributions and rescattering effects are part of the long distance QCD effects naturally contained in generalized form factors and 2-pion distribution amplitudes, which can be fitted to data. We present first results for the branching ratios of B⁰→ π⁺π⁻π⁰ to leading order in α_s and leading power in Λ_QCD/M_B.