Improving the precision of gamma/phi_3 via CLEO-c Measurements

TL;DR

This paper discusses how measurements from CLEO-c help improve the precision of the CKM phase gamma/phi_3 by analyzing quantum-correlated D meson decays, which are crucial for understanding CP violation in B decays.

Contribution

It introduces new analysis techniques for D decay parameters using CLEO-c data, enhancing the constraints on gamma/phi_3 measurements.

Findings

Improved constraints on strong phase differences in D decays.

Enhanced precision in gamma/phi_3 determination.

Demonstrated the impact of CLEO-c measurements on CKM phase analysis.

Abstract

Quantum correlations in $\psi(3770) \to D^0\bar{D}^0$ provide unique access to information about strong phase differences. Precision determination of the CKM phase $\gamma/\phi_3$ via $B \to D K$ decays depends upon constraints on charm mixing amplitudes, measurements of doubly-Cabibbo suppressed amplitudes and relative phases, and studies of correlated charmed meson decays tagged by flavor or CP eigenstates. CP-tagged $D^0 \to K^-\pi^+\pi^-\pi^+$ decays and CP-tagged $D^0 \to K^0_S\pi^+\pi^-$ Dalitz plots are only available at CLEO-c. Using the 818 pb$^{-1}$ CLEO-c data sample produced by the Cornell Electron Storage Ring (CESR) at $\sqrt{s} = 3.77$ GeV, we perform analyses of these decays. We describe the techniques used to measure the $D$-decay parameters, and the CLEO-c impact on measurements of $\gamma/\phi_3$.