The $K^-π^+$ S-wave from the $D^+ \to K^-π^+π^+$ decay

Using data from FOCUS (E831) experiment at Fermilab, we present a model independent partial-wave analysis of the $K^-π^+$ S-wave amplitude from the decay $D^+ \to K^-π^+π^+$. The S-wave is a generic complex function to be determined directly from the data fit. The P- and D-waves are parameterized by a sum of Breit-Wigner amplitudes. The measurement of the S-wave amplitude covers the whole elastic range of the $K^-π^+$ system.

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