Novel method for measuring charm-mixing parameters using multibody decays

Understand

We propose a novel method to measure flavor-oscillations and charge-parity (CP) violation in charm mixing.

• The approach uses multibody charm decays, such as $D^0\to K_S^0\pi^+\pi^-$, and avoids the need for a fit of the decay amplitudes while suppressing biases due to nonuniform signal-reconstruction efficiencies as functions of phase space and decay time.
• Data are partitioned in decay-time and Dalitz-plot regions (bins).
• The Dalitz-plot bins are symmetric with respect to the principal bisector and chosen to ensure nearly constant values of the strong-interaction phases in each.