D0D0bar Quantum Correlations, Mixing, and Strong Phases

TL;DR

This paper investigates quantum correlations in D0 and D0bar meson pairs produced at the psi(3770) resonance, measuring decay rates to determine the strong phase difference and charm mixing parameters.

Contribution

It provides new measurements of D0 decay branching fractions and constrains charm mixing and strong phase differences using quantum-correlated data.

Findings

Measured absolute branching fractions of D0 decays.

Determined cos(delta) for K-pi+ decay mode.

Limited the charm mixing amplitude y.

Abstract

Due to the presence of the quantum correlation between the pair-produced D0 and D0bar from the decay of the psi(3770), the time-integrated single and double tag decay rates depend on charm mixing amplitudes, doubly-Cabibbo-suppressed amplitudes, and the relative strong phase, delta, between D0 and D0bar decays to identical final states. Using 281 pb^-1 of integrated luminosity collected with the CLEO-c detector on the psi(3770) resonance, we measure the absolute branching fractions of D0 decays to K-pi+, CP eigenstates, and semileptonic final states to determine cos(delta) for K-pi+ and to limit the mixing amplitude y.