Measurement of branching fractions and charge asymmetries in B decays to an eta meson and a K* meson

TL;DR

This paper reports precise measurements of branching fractions and charge asymmetries in B meson decays to eta and K* mesons, using a large data sample from the BABAR experiment, providing insights into CP violation and decay dynamics.

Contribution

It presents the first comprehensive measurement of branching fractions and charge asymmetries for multiple B decay modes involving eta and K* mesons.

Findings

Measured branching fractions with uncertainties for six decay modes.

Determined charge asymmetries for all studied decay modes.

Results contribute to understanding CP violation in B decays.

Abstract

We present measurements of branching fractions and charge asymmetries for the decays etaK*, where K* indicates a spin 0, 1, or 2 Kpi system. The data sample corresponds to 344x10^6 BBbar pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We measure the branching fractions (in units of 10^-6): BR(B0->etaK*0)=16.5\pm1.1\pm0.8, BR(B+->etaK*+)=18.9\pm1.8\pm1.3, BR(B0->eta(Kpi)_0*0)=11.0\pm1.6\pm1.5, BR(B+->eta(Kpi)_0*+)=18.2\pm2.6\pm 2.6, BR(B0->etaK_2*0(1430))=9.6\pm1.8\pm1.1, and BR(B+->etaK_2*+(1430))=9.1\pm2.7\pm 1.4. We also determine the charge asymmetries for all decay modes.