Abstract
The coherent production process K +-nucleus→K + π + π −-nucleus has been analysed at 10 GeV/ c, in a heavy liquid bubble chamber. Evidence for a coherent process is obtained from the momentum transfer distribution; the cross section is 2.12 ± 0.36 mb per nucleus. The K + π + π −, mass distribution of the coherent events shows abundant production of the so-called Q + state, with a cross section of 1.70 ± 0.30 mb per nucleus. A Dalitz plot analysis of the K + π + π − system indicates J P =1 + for the Q + with a high probability. The predominant decay is K ∗π with some contribution of K ϱ. The density matrix elements for Q + -production have been studied.
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