Measurement of the Baryon-Exchange Reactions K exp - p Implies lambda eta, K exp - p Implies lambda pi exp 0 at 6 GeV/C and the Value of the etaNN-Coupling Constant

摘要

In order to determine the etaNN coupling constant we have measured the two reactions K exp - p implies lambda eta and K exp - p implies lambda pi exp 0 with a magnetic wire chamber spectrometer which contained a gamma counter for the gamma gamma -decays of pi exp 0 and eta. The lambda polarization and the differential cross-sections are given. The latter have quite different u-dependences. Their ratio is interpreted, in terms of a nucleon-Regge exchange model, as the effect of a small etaNN coupling constant for which we obtain G exp 2 sub(etaNN) = G exp 2 sub(etaNN). (0.26 +- 0.10) as allowed by SU sub 3 . The large value given by Heisenberg's non-linear field theory, G exp 2 sub(etaNN) = G exp 2 sub(etaNN). 0.9, is excluded by this measurement if the characteristic u-dependence of the lambda pi exp 0 channel is attributed to Nsub( alpha ) Regge exchange. (Atomindex citation 11:524158)