Charmed meson decays to two pseudoscalars

TL;DR

This paper analyzes updated decay data of charmed mesons into light pseudoscalars, revealing new insights into decay amplitudes, flavor symmetry, and meson mixing angles, impacting our understanding of charm decay processes.

Contribution

It provides a renewed analysis of decay amplitudes and flavor symmetry tests based on recent data, highlighting changes in phase relations and meson mixing angles.

Findings

Revised relative phases between decay amplitudes.

Smaller octet-singlet mixing angle for η and η' mesons.

Implications for interference in Cabibbo-favored decays.

Abstract

A recent update of data on the decays of $D^0$, $D^+$, and $D_s^+$ to pairs of light pseudoscalars calls for a renewed analysis of key decay amplitudes and tests of flavor symmetry. The present data change our previous understanding of relative phases between amplitudes that describe Cabibbo-favored decays of the charmed mesons. The new data also seem to favor a smaller octet-singlet mixing angle for the $\eta$ and $\eta'$ mesons when singly-Cabibbo-suppressed processes are taken into account. We also discuss the effects of the new data on interference between Cabibbo-favored and doubly-Cabibbo-suppressed decays.