Polarization in π+, K+ meson and proton elastic scattering on protons at 45 GeV/c

The polarization parameter P is measured in π+p, K+p and pp elastic scattering at the momentum of 45 GeV/c for the 4-momentum transfers from -0.08 up to -1.1 (GeV/c)2 for the pp scattering and from -0.08 up to -0.9 (GeV/c)2 for π+p and K+p scattering. Energy dependence of the polarization P(t) in the π+p and K+p scatterings above 6 GeV/c is consistent with the interference between the pomeron and the reggeon. On the other hand, the polarization in the pp scattering decreases faster than it is predicted by the conventional Regge-pole model. The result may be due to an interference between the pomeron amplitudes conserving and changing the helicity, resulting in a negative polarization