Input from the Charm Threshold for the Measurement of the CKM Angle $$\gamma $$

Abstract

A brief overview of the inputs from charm threshold that are essential to the determination of the Unitarity Triangle angle γ is presented. The focus is on the measurements of four-body final states that have not previously been considered: D 0 → K 0 S π + π − π 0 and D 0 → π + π − π + π − .