Study of the Cabibbo-suppressed decay modes D0-->Pi-pi+ and D0-->K-K+

TL;DR

This paper reports new measurements of branching ratios for specific D0 meson decay modes, providing insights into isospin amplitudes and phase shifts, using data from the Fermilab FOCUS experiment.

Contribution

It presents the first precise measurements of certain D0 decay branching ratios and combines them with existing data to analyze isospin properties.

Findings

Measured branching ratio Gamma(D0-->K-K+)/Gamma(D0-->Pi-Pi+) = 2.81 +/- 0.10(stat) +/- 0.06(syst)

Determined phase shifts for D-->KK and D-->PiPi decays

Extracted isospin amplitude ratios from combined data

Abstract

Using data from the FOCUS (E831) experiment at Fermilab, we present a new measurement for the branching ratios of the Cabibbo-suppressed decay modes D0-->Pi-Pi+ and D0-->K-K+. We measured: Gamma(D0-->K-K+)/Gamma(D0-->Pi-Pi+) = 2.81 +/- 0.10(stat) +/- 0.06(syst), Gamma(D0-->K-K+)/Gamma(D0-->K-Pi+) = 0.0993 +/- 0.0014(stat) +/- 0.0014(syst), and Gamma(D0-->Pi-Pi+)/Gamma(D0-->K-Pi+) = 0.0353 +/- 0.0012 (stat) +/- 0.0006(syst). These values have been combined with other experimental data to extract the ratios of isospin amplitudes and the phase shifts for the D-->KK and D-->PiPi decay channels.