Non-leptonic decays of Charmed mesons into two Pseudoscalars

Understand

We examine the role of resonant coupled channel final state interactions (FSI), as well as weak annihilation and exchange contributions in explaining all the two body hadronic $D\rightarrow PP$ decay modes data.

• In the un-unitarized amplitudes we include modified Wilson coefficients with non-factorizable corrections as parameters.
• For the hadronic form factors, the z-series expansion method is used to get the $q^2$ dependence.
• The FSI effects are incorporated via a phenomenological approach with widths of resonances to various channels taken from observations where available, and others as additional parameters to be determined from fits of all the theoretical rates to the measured ones.