Unbinned model-independent measurements with coherent admixtures of multibody neutral D meson decays

摘要

Various studies of Standard Model parameters involve measuring the properties of a coherent admixture of D0 and D¯0 states. A typical example is the determination of the Unitarity Triangle angle γ in the decays B→DK, D→KS0π+π-. A model-independent approach to perform this measurement is proposed that has superior statistical sensitivity than the well-established method involving binning of the D→KS0π+π- decay phase space. The technique employs Fourier analysis of the complex phase difference between D0 and D¯0 decay amplitudes and can easily be generalised to other similar measurements, such as studies of charm mixing or determination of the angle β from B0→Dh0 decays.