Evidence for the Existence of aZ*

Abstract

Results of a phase-shift analysis with and without the use of a Regge-pole model in $K^{+}p$ elastic scattering from 0.86 to 1.95 GeV/c are described. We have obtained four possible solutions, all of which indicate resonantlike behavior in one partial-wave amplitude. Three of our solutions yield a $P_{\frac{3}{2}}$ partial wave with a behavior consistent with the Breit-Wigner resonance formula. The properties of such a $Z^{*}$ resonance are described.