Charmed meson decays to two pseudoscalars

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 ${\eta }^{\prime }$ 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.

Comments: 15 pages, 7 figures, to be submitted to Phys. Rev. D