Search for the P11Σ(1660) resonance in the reactions K− + p → Σ± + π∓ in the momentum range 597 to 888 MeVc

The reaction cross sections, differential cross sections and Σ ⁺ polarization for the reactions K^? + p → Σ^± + π^? at 8 momenta in the range 688 to 833 MeV/c were obtained. A partial-wave analysis was performed over the momentum range 597 to 888 MeV/c using the present data together with data in the neighboring momentum regions. A satisfactory solution was obtained with the well-established S₀₁ Λ(1670), D₀₃ Λ(1690) and D₁₃ Σ(1670) resonances. The addition of a P₁₁ resonance with a mass, width, and branching ratio of 1665 MeV/c², 82 MeV/c² and ?0.13 improved the χ² per degree of freedom by an insignificant amount, indicating that the coupling of the p¹¹Σ(1660) to the Σ^±ν^? channels is at best marginal.