Comparative study ofρ0,ω,K*0(890), andK¯*0(890)production by charge-exchange reactions
- 1 March 1978
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 17 (5) , 1197-1255
- https://doi.org/10.1103/physrevd.17.1197
Abstract
We present cross sections and density-matrix elements from a high-statistics study of the reactions , , and , at 3, 4, and 6 GeV/c and four-momentum transfer squared to the recoil nucleon . The experiment was carried out at the Argonne Zero Gradient Synchrotron using the effective-mass spectrometer. In the same experiment, we have measured the interference cross sections by comparison of the two reactions and , to which the interference terms contribute with opposite signs. We examine the systematics of production: In the channel we find little shrinkage with energy of the helicity-0 cross sections, which are presumably dominated by exchange; the helicity-1 cross sections exhibit considerable shrinkage for unnatural-parity exchange, and antishrinkage for natural-parity exchange. The and production observables exhibit significant differences, especially in the helicity-1 states. These differences are due to interference between even- and odd--parity exchange amplitudes and they are related by SU(3) symmetry to interference effects and to the and production observables. It is shown that exchange-degeneracy-breaking effects satisfy SU(3) symmetry and can be explained qualitatively in the frame-work of SU(3)-symmetric, strongly absorbed Regge-pole models. The results of our amplitude analysis are compared with previous phenomenological analyses and model predictions.
Keywords
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