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Using data from FOCUS (E831) experiment at Fermilab, we present a modelindependent partial-wave analysis of the $K^-\pi^+$ S-wave amplitude from thedecay $D^+ \to K^-\pi^+\pi^+$. The S-wave is a generic complex function to bedetermined directly from the data fit. The P- and D-waves are parameterized bya sum of Breit-Wigner amplitudes. The measurement of the S-wave amplitudecovers the whole elastic range of the $K^-\pi^+$ system.

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