Some problems of determination of the spin structure of the scattering amplitude and experiments at NICA

TL;DR

This paper investigates the determination of the spin structure of the scattering amplitude in high-energy proton-proton and proton-antiproton elastic scattering, highlighting discrepancies in the rho(s,t) ratio from experimental data and dispersion analysis.

Contribution

It analyzes experimental data under various assumptions to assess the rho(s,t) ratio, revealing consistent deviations from dispersion analysis in proton-antiproton scattering.

Findings

Experimental rho(s,t) values differ from dispersion analysis

Deviations observed across multiple assumptions

Highlights need for refined models of scattering amplitude

Abstract

The existing experimental data are examined under different assumptions about the structure of the scattering amplitude of the proton-proton and proton-antiproton elastic scattering at high energy to obtain the value of rho(s,t), the ratio of the real to imaginary part of the scattering amplitude in the Coulomb-hadron interference region. It is shown that the deviation of rho(s,t) obtained from the experimental data of the proton-antiproton scattering at 3.8 < P_L <6.2 GeV/c from the dispersion analysis is concern in all examined assumptions.