Violation of s - Channel Helicity Conservation and Composite Structure of Hadrons

s-channel helicity conservation (SHC) for Pomeron exchanging amplitude was discovered empirically for rP----"PoP reaction, 1l and was suggested to hold also in the case of nN elastic scattering_"> Later analysis on nN scattering amplitudes,3> however, showed that the ratio, IF1_1f(IF~+i.J-T/s0 ), which may be considered as a barometer of the violation of SHC for I, =0 exchanging amplitudes, was found to be small but significantly different from zero and its energy dependence was rather weak. As an origin of this non-vanishing F~_, contributions from P' trajectory are usually assumed4> but this possibility seems quite puzzling, since the experimental analysis shows that the relative phase between helicity flip and nonflip amplitudes is very close to 180°. In this paper we would like to show the possibility that the violation of SHC in -rrN scattering mainly comes from the composite structure of hadrons. It is shown that the s-channel helicity conserving quark-quark scattering amplitudes inevitably lead to the violation of SHC in -rrN scattering and that the correct ratio between the helicity flip and non-flip amplitudes including their relative phase can be obtained. In § 2, the general formalism for the construction of nN scattering amplitudes from quark-quark scattering amplitudes is presented and comparison with expenmental results is made. In the last section, we discuss the consequences of our results and further developments.