Observation of B+->b_1+K0 and search for B-meson decays to b_10K0 and b_1pi0

TL;DR

This paper reports the observation of specific B meson decay modes involving b_1 mesons and searches for related decay channels, providing measurements of branching fractions and charge asymmetry using data from the BABAR detector.

Contribution

First measurement of B+ and B0 decays to b_1 mesons with kaons and pions, including branching fractions and asymmetry, using a large dataset from BABAR.

Findings

Measured branching fractions for B+ to b_1+K0 and B0 to b_10K0.

Set upper limits for B+ to b_1+pi0 and B0 to b_10pi0 decays.

Found charge asymmetry consistent with zero.

Abstract

We present the results of searches for decays of B mesons to final states with a b_1 meson and a neutral pion or kaon. The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent 465 million BBbar pairs produced in e+e- annihilation. The results for the branching fractions are, in units of 1e-6, BR(B+ to b_1+K0) = 9.6+/-1.7+/-0.9, BR(B0 to b_10K0) = 5.1+/-1.8+/-0.5 (<7.8), BR(B+ to b_1+pi0) = 1.8+/-0.9+/-0.2 (<3.3), and BR(B0 to b_10pi0) = 0.4+/-0.8+/-0.2 (<1.9), with the assumption that BR(B_1 to omega pi)=1. We also measure the charge asymmetry A_ch(B+ to b_1+K0) = -0.03+/-0.15+/-0.02. The first error quoted is statistical, the second systematic, and the upper limits in parentheses indicate the 90% confidence level.