Searches for Charmless Decays B0 -> eta omega, B0 -> eta K0, B+ -> eta rho+, and B+ -> eta' pi+

TL;DR

This paper reports the first measurements of branching fractions for four previously unobserved B-meson decays involving eta or eta' mesons, using data from 182 million B-Bbar pairs at the Upsilon(4S).

Contribution

It provides new experimental measurements of branching fractions for specific charmless B-meson decays, expanding knowledge of B decay channels involving eta and eta' mesons.

Findings

Measured branching fractions for four decay modes.

Provided charge asymmetry measurements for two decay modes.

Results are consistent with or improve upon previous limits.

Abstract

We present measurements of branching fractions for four previously unobserved B-meson decays with an eta or eta' meson in the final state. The data sample corresponds to 182 million B-Bbar pairs produced from e+e- annihilation at the Upsilon(4S) resonance. We measure the following branching fractions in units of 10^-6: BF(B0 -> eta omega) = 1.2 +/- 0.6 +/- 0.2 (<2.3 at 90% C.L.), BF(B0 -> eta K0) = 2.5 +/-0.8 +/- 0.1, BF(B+ -> eta rho+) = 8.6 +/- 2.2 +/- 1.1, and BF(B+ -> eta' pi+) = 4.2 +/- 1.0 +/- 0.5, where the first error quoted is statistical and the second systematic. The charge asymmetries are A_ch(B+ -> eta rho+) = (7 +/- 19 +/- 2)% and A_ch(B+ -> eta' pi+) = (24 +/- 19 +/- 1)%. All results are preliminary.