Observation of B¯D(*)π+πν¯ Decays in e+e Collisions at the Υ(4S) Resonance

J. P. Lees et al. (BABAR Collaboration)
Phys. Rev. Lett. 116, 041801 – Published 26 January 2016

Abstract

We report on measurements of the decays of B¯ mesons into the semileptonic final states B¯D(*)π+πν¯, where D(*) represents a D or D* meson and is an electron or a muon. These measurements are based on 471×106 BB¯ pairs recorded with the BABAR detector at the SLAC asymmetric B factory PEP-II. We determine the branching fraction ratios Rπ+π(*)=B(B¯D(*)π+πν¯)/B(B¯D(*)ν¯) using events in which the second B meson is fully reconstructed. We find Rπ+π=0.067±0.010±0.008 and Rπ+π*=0.019±0.005±0.004, where the first uncertainty is statistical and the second is systematic. Based on these results and assuming isospin invariance, we estimate that B¯D(*)ππν¯ decays, where π denotes either a π± and π0 meson, account for up to half the difference between the measured inclusive semileptonic branching fraction to charm hadrons and the corresponding sum of previously measured exclusive branching fractions.

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  • Received 31 July 2015

DOI:https://doi.org/10.1103/PhysRevLett.116.041801

© 2016 American Physical Society

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Vol. 116, Iss. 4 — 29 January 2016

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