The kappa in E791 data for D->K-pi-pi

Abstract

A combined fit is made to E791 data on D->K-pi-pi, LASS data on K-pi elastic scattering, and BES II data on J/Psi->K*(890)-K-pi.In all cases, the K-pi S-wave is fitted well with a kappa resonance and Ko(1430); the kappa requires an s-dependent width with an Adler zero near threshold. The pole position of the kappa is at M - iGamma/2 = (750 +30 -55) - i(342 +- 60) MeV. The E791 collaboration fitted their data using a form factor for the production process D->kappa-pi. It is shown that this form factor is not needed. The data require point-like production with an RMS radius <0.38 fm with 95 percent confidence.

11 pages, 4 figures. Typos corrected. Material added to explain how a pole is possible without the phase shift on the real s-axis going through 90 degrees

References in corpus (2)

• Final State Interactions in Hadronic D decays
• The Kappa in J/Psi -> Kpplus-piminus-Kminus-piplus

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