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T: Fachverband Teilchenphysik

T 18: Flavourphysik (Theorie) 1

T 18.1: Talk

Monday, March 4, 2013, 11:00–11:15, WIL-B122

General Analysis of B → K^(*) ℓ⁺ ℓ⁻ Decays at Low Recoil — Christoph Bobeth¹, Gudrun Hiller², and •Danny van Dyk^2,3 — ¹Excellence Cluster Universe, Technische Universität München, D-85748 Garching, Germany — ²Institut für Physik, Technische Universität Dortmund, D-44221 Dortmund, Germany — ³Theoretische Physik 1, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Walter-Flex-Straße 3, D-57068 Siegen, Germany

We study the decay B→K^*(→ K π)ℓ⁺ℓ⁻ for ℓ = e,µ in the most general scenario of effective operators [sΓ b][ℓΓ′ ℓ], including tensor operators. The application of the low recoil framework yields several phenomenologically interesting results. The latter include observables H_T⁽ⁱ⁾, A_im/A_FB, and related CP asymmetries, which are free from hadronic matrix elements in the full basis of operators. They also include short-distance-free observables that allow extraction of the ratio of the hadronic form factors f₀/f_∥. We further point out means to probe the Operator Product Expansion of the low recoil framework. We find correlations among B→Kℓ⁺ℓ⁻ and B→K^*ℓ⁺ℓ⁻ observables at low recoil which help to constrain New Physics effects, especially when using the latest LHCb measurement of the observable F_H.