Abstract
We have performed a partial wave analysis of the K °π +π − system produced in the reaction K − p→ K °π +π − n at 11 GeV/c and detected in the LASS spectrometer at SLAC. Results from an analysis of ≈7600 events in the K °π +π − mass range from 1090 to 2290 MeV/ c 2 produced at low t(∥ t′∥<0.3 (GeV/ c) 2) are described. The J P = 2 +, 3 − and 4 + amplitudes show the behavior expected of the leading K ∗(1430), K ∗(1780) and K ∗(2060) respectively. The behavior of the J P = 1 + and 2 − amplitudes can be associated with the Q 2(1400) and the L(1770). The 1 − amplitudes exhibit behavior which indicates the existence of two resonant states, one near 1400 MeV/ c 2 and the other near 1800 MeV/ c 2. A simple Breit-Wigner model is used to fit the leading partial wave amplitudes and to compute branching ratios for the K ∗(1430) and the K ∗(1780).
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