First determination of the CP content of D->pi+pi-pi0 and D->K+K-pi0

TL;DR

This study measures the CP-even content of specific D meson decays using quantum-correlated data, providing new insights for improving the precision of the unitarity triangle angle gamma in B meson decays.

Contribution

First measurement of the CP-even fraction of D->pi+pi-pi0 and D->K+K-pi0 decays using quantum-correlated psi(3770) data.

Findings

CP-even fraction of D->pi+pi-pi0 is 0.968 +/- 0.017 +/- 0.006.

CP-even fraction of D->K+K-pi0 is 0.731 +/- 0.058 +/- 0.021.

Modes with high CP-even content can enhance gamma angle measurements.

Abstract

Quantum-correlated psi(3770)->DDbar decays collected by the CLEO-c experiment are used to perform first measurements of F+, the fractional CP-even content of the self-conjugate decays D->pi+pi-pi0 and D->K+K-pi0. Values of 0.968 +/- 0.017 +/- 0.006 and 0.731 +/- 0.058 +/- 0.021 are obtained for pi+pi-pi0 and K+K-pi0, respectively. It is demonstrated how modes of this sort can be cleanly included in measurements of the unitarity triangle angle gamma using B+/- -> D K+/- decays. The high CP-even content of D -> pi+pi-pi0, in particular, makes this a promising mode for improving the precision on gamma.