Measurement of ${CP}\xspace$ Violation Parameters with a Dalitz Plot Analysis of $B^\pm \to D_{\pi^+\pi^-\pi^0} K^\pm$

TL;DR

This paper measures CP violation parameters in B+/- decays using Dalitz plot analysis of D meson decay to pi+pi-pi0, utilizing a large dataset from the BaBar experiment to extract CKM phase information.

Contribution

It introduces a novel Dalitz plot analysis method to determine CP violation parameters and D decay amplitudes in B meson decays, based on extensive BaBar data.

Findings

Measured CP violation parameters related to CKM phase gamma.

Determined magnitudes and phases of D0 decay amplitudes.

Provided precise branching fraction and asymmetry measurements.

Abstract

We report the results of a CP violation analysis of the decay B+/- --> D(pipipi0)K+/-, where D(pipipi0) indicates a neutral D meson detected in the final state pi+pi-pi0, excluding K_S pi0. The analysis makes use of 324 million e+e- --> BB events recorded by the BaBar experiment at the PEP-II e+e- storage ring. By analyzing the pi+pi-pi0 Dalitz plot distribution and the B+/- --> D(pipipi0)K+/- branching fraction and decay rate asymmetry, we calculate parameters related to the phase gamma of the CKM unitarity triangle. We also measure the magnitudes and phases of the components of the D0 --> pi+pi-pi0 decay amplitude.