Search for B-meson decays to b1rho and b1K*

TL;DR

This paper reports a search for specific B-meson decay modes involving b1 and rho or K* mesons, setting upper limits on their branching fractions due to no significant signal detection in a large data sample.

Contribution

The study provides the first upper limits on B-meson decays to b1rho and b1K* final states using a large dataset from the BaBar detector.

Findings

No statistically significant signals observed.

Upper limits on branching fractions range from 1.4 to 8.0 x 10^{-6}.

Results constrain theoretical models of B-meson decays.

Abstract

We present a search for decays of $B$ mesons to final states with a $b\_1$ meson and a $\rho$ or $K^*(892)$ meson. The search is based on a data sample consisting of 465 million $B\kern 0.18em{\kern -0.18em B}{}$ pairs collected by the {\slshape B\kern-0.1em{\smaller A}\kern-0.1em B\kern-0.1em{\smaller A\kern-0.2em R}} detector at the SLAC National Accelerator Laboratory. We do not observe any statistically significant signal. The upper limits we set on the branching fractions range from 1.4 to $8.0 \times 10^{-6}$ at the 90% confidence level (C.L.), including systematic uncertainties.