Observation of B->etarho+ and search for B0 Decays to eta'eta, etapi0, eta'pi0, and omegapi0

TL;DR

This paper reports measurements of branching fractions for five rare B-meson decay modes, including the first observation of B+ -> etarho+ and upper limits for the other four decays, based on data from the BABAR detector.

Contribution

First observation of B+ -> etarho+ decay and new upper limits for four other B-meson decay modes using a large dataset from BABAR.

Findings

BR(B+ -> etarho+) = (9.9 +/- 1.2 +/- 0.8) x 10^{-6}

Upper limits set for B0 decays to eta'eta, etapi0, eta'pi0, and omegapi0

Charge asymmetry Ach(B+ -> etarho+) measured as 0.13 +/- 0.11 +/- 0.02

Abstract

We present measurements of branching fractions for five B-meson decays to two-body charmless final states. The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent 459 million BBbar pairs. The results for branching fractions are, in units of 10^{-6} (upper limits at 90% C.L.): BR(B+ -> etarho+) = 9.9 +/- 1.2 +/- 0.8, BR(B0 -> eta'eta) = 0.5 +/- 0.4 +/- 0.1 (<1.2), BR(B0 -> etapi0) = 0.9 +/- 0.4 +/- 0.1 (<1.5), BR(B0 -> eta'pi0) = 0.9 +/- 0.4 +/- 0.1 (<1.5), and BR(B0 -> omegapi0) = 0.07 +/- 0.26 +/- 0.02 (<0.5). The first error quoted is statistical and the second systematic. For the etarho+ mode, we measure the charge asymmetry Ach(B+ -> etarho+) = 0.13 +/- 0.11 +/- 0.02.