Measurement of the CP Asymmetry and Branching Fraction of B^0 to rho^0 K^0

TL;DR

This paper reports a measurement of the branching fraction and CP asymmetry parameters for B^0 to rho^0 K^0 decays using data from the BaBar detector, providing insights into CP violation in B meson decays.

Contribution

First measurement of the branching fraction and CP asymmetry parameters for B^0 to rho^0 K^0 decays using a large data sample from BaBar.

Findings

Branching fraction B(B^0 to rho^0 K^0) = (4.9 ± 0.8 ± 0.9) × 10^-6

CP parameter S = 0.20 ± 0.52 ± 0.24

CP parameter C = 0.64 ± 0.41 ± 0.20

Abstract

We present a measurement of the branching fraction and time-dependent CP asymmetry of B^0 to rho^0 K^0. The results are obtained from a data sample of 227 10^6 Y4S to BB_ decays collected with the BaBar detector at the PEP2 asymmetric-energy B Factory at SLAC. From a time-dependent maximum likelihood fit yielding 111+/-19 signal events we find B(B^0 to rho^0 K^0)=(4.9+/-0.8+/-0.9) 10^-6, where the first error is statistical and the second systematic. We report the measurement of the CP parameters S=0.20+/-0.52+/-0.24 and C=0.64+/-0.41+/-0.20.