Dresden 2013 – scientific programme

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T: Fachverband Teilchenphysik

T 41: Bottom-Quarks 2

T 41.6: Talk

Monday, March 4, 2013, 18:00–18:15, GER-054

Measurement of higher mass states of B → X_u ℓ ν decays with the Belle detector. — •Cesar Beleno and Ariane Frey — Universität Göttingen

Semileptonic decays of B mesons are the most feasible way for measuring the CKM matrix element |V_ub|. One approach for extracting this element is using exclusive analysis in which a particular channel is reconstructed. Up to date the most precise measurement of this element is coming from B→ π ℓ ν. However, the dominant systematic errors for this measurement are coming from uncertainties in the knowledge of branching ratios and form factors of other exclusive B→ X_uℓ ν. In this analysis we performed a spectroscopy study of semileptonic decays with the final state meson reconstructed in π⁺ π⁻ and K⁺ K⁻ channel. This measurement is based on a data sample of 772 million B B pairs, collected by the Belle detector at KEKB.