Abstract
In δ production processes like π + p → π 0δ ++, K + p → K 0δ ++, K − n → K 0δ − , exchange degeneracy breaking between ϱ and A 2 Regge poles is shown to be present in all s-channel helicity amplitudes including the double-flip one. Once. the dominance of two among four amplitudes and SU(3) invariance are assumed, the amplitudes are obtained in a rather model-indenpendent way. The peculiar feature of these amplitudes are analyzed and in particular some evidence for universality in the impact parameter representation is pointed out. Possible explanations are proposed.
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