Helicity - Conserving and Helicity - Nonconserving Pomeron Exchange Amplitudes in the Dual Absorptive

The predictive power of the dual absorptive model for Pomeron exchange amplitudes is critically studied. Applications are made to the helicity conserving amplitudes in pp-pp, and to the helicity nonconserving amplitudes in yp-pop. t The dual absorptive model' was recently applied to a fairly large number ' of two body meson-baryon processes, 2 43 including photoproduc tion of p " mesons. This model specifies the form of the imaginary part of two body amplitudes in the impact parameter (b) space. The t dependence of these amplitudes is obtained by performing a Bessel transform: 00 Imf(t) = j db b F(b) J&b&) 0 (1) where Ah is the net helicity flip in the s-channel, F(b) is the profile function, and both F and f depend implicitly on s.