Results of the Experiments with Fixed Targets

Abstract

The comparative investigation of polarization phenomena in the interaction of particles and antiparticles is an important but insufficiently developed research direction. The known Pomeranchuk hypothesis states that total interaction cross sections of particles and antiparticles should be equal in the asymptotic limit in the case of unpolarized hadrons (Pomeranchuk in Zh. Eksp. Teor. Fiz. 34:725, 1958). This hypothesis is experimentally tested up to a center-of-mass energy of 63 GeV at ISR. The asymptotic limit in the sense of this hypothesis has not yet been reached. There is no any experimental test of this hypothesis for the case of the interaction of polarized particles and antiparticles. In Sect. 3.2, we mentioned the hypothesis proposed in Logunov et al. (Dokl. Akad. Nauk SSSR 142:317, 1962), and Nambu and Iona-Lasinio (Phys. Rev. 122:345, 1961) of the γ 5 invariance of strong interaction in the asymptotic limit. Certain asymptotic relations between the polarization parameters in cross reaction channels are predicted in a number of theoretical works (see Sect. 3.3). Unfortunately, they have not yet been experimentally tested. There is only one experimental work on studying the polarization of particles and antiparticles in elastic scattering. It will be described below (Nurushev In: Proceedings of the 9th international symposium on high energy spin physics, Bonn, Germany, p. 34, 1990).