Abstract
Preliminary results are presented from an analysis of the π + π − system produced in the reaction K − p → π + π − Λ at 11 GeV/c observed with the LASS spectrometer at SLAC. A clear ϱ - ω interference effect is observed, and a fit to the natural parity exchange mass distribution yields a branching fraction estimate of (1.7 ± 0.5) % for the decay ω → π + π −. An amplitude analysis reveals that the bump in the mass distribution in the vicinity of the ƒ 2(1270) actually contains a significant P-wave component. The mass dependence of the corresponding amplitude and phase is well described by a resonant Breit-Wigner line-shape with mass (1266 ± 14) MeV/c 2, width (166 ± 35) MeV/c 2, and estimated elasticity ∼ 5%. The interpretation of this state as the first radial excitation of the ϱ(770) is discussed.
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