Comment on evidence for new interference phenomena in the decay D+ -> K- pi+ mu+ nu

Details Comment on evidence for new interference phenomena in the decay D+ -> K- pi+ mu+ nu Comment on evidence for new interference phenomena in the decay D+ -> K- pi+ mu+ nu

2005-08-10

arxiv.org/abs/hep-ph/0508116v2

Phys.Lett. B628 (2005) 223-227

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, plain latex; version with minor changes compared to v1 on lepton masses effects, sign error eliminated, clarifying re

Scientific paper

10.1016/j.physletb.2005.09.047

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_l4 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_l4 decays can be applied to charm meson decays to provide constraints on violation of |Delta I|=1/2 rule and T-violation.

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