# Comment on evidence for new interference phenomena in the decay $D^{+} ---> K^{-} \pi ^{+} \mu ^{+} \nu$

Ananthanarayan, B and Shivaraj, K (2005) Comment on evidence for new interference phenomena in the decay $D^{+} ---> K^{-} \pi ^{+} \mu ^{+} \nu$. [Preprint]

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The experimental determination of low energy \pi K scattering phase shifts would assist in determining scattering lengths as well as low energy constants of chiral perturbation theory for which sum rules have been constructed. The FOCUS collaboration has presented evidence for interference pheomena from their analysis of $D_{\mu}$ decays based on decay amplitudes suitable for a cascade decay D -> K* -> K \pi . We point out that if the well-known full five body kinematics are taken into account, \pi K scattering phases may be extracted. We also point out that other distributions considered in the context of $K_{\mu}$ decays can be applied to charm meson decays to provide constraints on violation of |\Delta I| = 1/2 rule and T-violation.