Hamburg 2016 – scientific programme
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T: Fachverband Teilchenphysik
T 29: B-Meson Zerfälle
T 29.7: Talk
Monday, February 29, 2016, 18:15–18:30, VMP6 HS F
Search for exclusive charmless semileptonic decays of B→ ππℓν with the Belle detector — •Cesar Beleno and Ariane Frey for the Belle collaboration — II. Physikalisches Institut, Goettingen University, Germany
Semileptonic decays of B mesons are the most suitable way to measure the magnitude of CKM matrix elements such as |Vub| and |Vcb|. One technique for extracting these quantities is using an exclusive analysis in which a particular channel is reconstructed. For instance, for the study of Vub just about 25% of the exclusive decay channels for charmless semileptonic decays of B mesons have been measured. Currently, the most precise measurement of |Vub| comes from the exclusive channel B→πℓν. However, the dominant systematic errors for this measurement stem from uncertainties in the knowledge of branching fractions and form factors of other charmless semileptonic B decays. In this analysis, we perform a spectroscopy study of semileptonic decays with the final state meson decaying into two pions. We implement a boosted decision tree method to reduce the contributions of background using the complete data set collected by the Belle detector.