Two-body B Meson Decays to eta and eta': Observation of B->eta K*

TL;DR

This paper reports the observation and measurement of specific B meson decay modes involving eta and eta' mesons, providing new experimental data on their branching fractions from a sample of 19 million B mesons.

Contribution

The study presents the first observation of B -> eta K* decays and improves measurements of B -> eta'K branching fractions, enhancing understanding of B meson decay processes.

Findings

Measured branching fractions for B -> eta K* and eta'K decays.

First observation of B -> eta K* decay mode.

Set upper limits for related decay modes.

Abstract

In a sample of 19 million produced B mesons, we have observed the decays B -> eta K* and improved our previous measurements of B -> eta'K. The branching fractions we measure for these decay modes are BR(B+ -> eta K*+) = (26.4 +9.6-8.2 +- 3.3) x $10^{-6}$, BR(B0 -> eta K*0) = (13.8 +5.5-4.6 +- 1.6) x $10^{-6}$, BR(B+ -> eta' K+) = (80 +10-9 +- 7) x $10^{-6}$ and BR(B0 -> eta' K0) = (89 +18-16 +- 9) x $10^{-6}$. We have searched with comparable sensitivity for related decays and report upper limits for these branching fractions.