Search for B+ meson decay to a1+ K*0

TL;DR

This paper reports a search for the decay B+ --> a1+ K*0 using data from the BaBar experiment, setting an upper limit on the branching fraction due to no significant signal observed.

Contribution

First search for B+ --> a1+ K*0 decay, providing an upper limit on its branching fraction based on BaBar data.

Findings

Branching fraction upper limit: 1.6 x 10^-6 at 90% CL

Data sample of 465 million BB pairs used

No significant decay signal observed

Abstract

We present the preliminary result of a search for the decay B+- --> a1+-K*0. The data, collected with the BaBar detector at the Stanford Linear Accelerator Center, represent 465 million BB pairs produced in e+e- annihilation at the Y(4s) energy. The result for the branching fraction is: B(B+ --> a1+ K*0) * B(a1+ --> pi+pi-pi+) = (0.7 +0.5/-0.4 +/-0.7) x 10-6, corresponding to an upper limit at 90% confidence level of 1.6 x 10-6. The first error quoted is statistical, the second systematic.