Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 119: Flavour (Theorie/Experiment) 3

T 119.5: Talk

Thursday, March 27, 2014, 17:45–18:00, GFH 01-701

Measurement of higher mass states of B→ X_uℓν with the Belle detector — •Cesar Beleno and Ariane Frey for the Belle collaboration — Göttingen Universität

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→πℓν. However, the dominant systematic errors for this measurement stem from uncertainties in the knowledge of branching ratios and form factors of other exclusive charmless semileptonic decays. In this analysis we performed a spectroscopy study of semileptonic decays with the final state meson decaying in two hadrons, π or K. This measurement is based on a data sample of 772 million BB pairs, collected by the Belle detector at KEKB.