Observation of B --> eta' K* and Evidence for B --> eta' rho+

TL;DR

This paper reports the first observation of B meson decays to eta' K* with measured branching fractions, and provides evidence for B decays to eta' rho+, along with upper limits for related channels, using data from the BABAR experiment.

Contribution

It presents the first observation of B→eta' K* decays and evidence for B→eta' rho+ decays, expanding knowledge of B meson decay modes.

Findings

Observation of B→eta' K* with branching fraction ~4.1×10^{-6}

Evidence for B→eta' rho+ with branching fraction ~8.7×10^{-6}

Upper limits set for other related decay modes

Abstract

We present an observation of $B\to\eta^\prime K^*$. The data sample corresponds to 232 million $B\bar{B}$ pairs collected with the BABAR detector at the PEP-II asymmetric-energy $B$ Factory at SLAC. We measure the branching fractions (in units of $10^{-6}$) $\mathcal{B}(B^0\to\eta^\prime K^{*0}) = 3.8\pm1.1\pm0.5$ and $\mathcal{B}(B^+\to\eta^\prime K^{*+}) = 4.9^{+1.9}_{-1.7}\pm0.8$, where the first error is statistical and the second systematic. A simultaneous fit results in the observation of $B\to\eta^\prime K^*$ with $\mathcal{B}(B\to\eta^\prime K^*) = 4.1_{-0.9}^{+1.0} \pm 0.5$. We also search for $B\to\eta^\prime \rho$ and $B\to\eta^\prime f_0(980)(f_0 \to \pi^+\pi^-)$ with results and 90% confidence level upper limits $\mathcal{B}(B^+\to\eta^\prime \rho^+) = 8.7^{+3.1}_{-2.8}{} ^{+2.3}_{-1.3}$ ($<14$), $\mathcal{B}(B^0\to\eta^\prime \rho^0) < 3.7$ and $\mathcal{B}(B^0\to\eta^\prime f_0(980)(f_0\to\pi^+\pi^-)) < 1.5$. Charge asymmetries in the channels with significant yields are consistent with zero.