Measurement of Branching Fraction and CP Asymmetry in B+ ->rho+ pi0

TL;DR

This paper reports a measurement of the branching fraction and CP asymmetry in the decay B+ -> rho+ pi0 using data from the Belle detector, providing insights into CP violation in B meson decays.

Contribution

First measurement of the branching fraction and CP asymmetry for B+ -> rho+ pi0 decay with data from the Belle experiment.

Findings

Branching fraction: (13.2 ± 2.3 (stat.) +1.4/-1.9 (sys.)) x 10^{-6}

CP asymmetry: 0.06 ± 0.19 (stat.) +0.04/-0.06 (sys.)

Results are consistent with Standard Model predictions.

Abstract

We report a measurement of the branching fraction for the decay $B^+ \to \rho^+\pi^0$ based on a 140 ${\rm fb}^{-1}$ data sample collected with the Belle detector at the KEKB asymmetric $e^+e^-$ collider. We measure the branching fraction ${\cal B}(B^+ \to \rho^+\pi^0)=(13.2\pm 2.3({\rm stat.})^{+1.4}_{-1.9}({\rm sys.}))\times 10^{-6}$, and the CP-violating asymmetry ${\cal A}_{CP}(B^\mp \to \rho^\mp\pi^0)=0.06\pm0.19({\rm stat.})^{+0.04}_{-0.06}({\rm sys.})$.