Features of forward $\pi N$ scattering from a Reggeized model

TL;DR

This paper develops a Regge-based model to analyze forward pion-nucleon scattering, successfully reproducing charge exchange and elastic scattering data up to high energies, and introduces new trajectories and corrections for improved accuracy.

Contribution

The paper introduces a novel Reggeized model incorporating Pomeron and meson exchanges, along with new trajectories and Regge cut corrections, to better describe pion-nucleon scattering data.

Findings

Charge exchange cross section dominated by single $ ho$ exchange.

Elastic scattering data well fitted with $f_2$ and Pomeron exchanges.

New Pomeron exchange model effectively describes high-energy elastic scattering.

Abstract

Charge exchange process $\pi^-p\to\pi^0n$ and elastic scatterings $\pi^\pm p\to \pi^\pm p$ are investigated within the Regge framework where the relativistic Born amplitude is reggeized for the $t$-channel meson exchange. Charge exchange cross section is featured by the single $\rho$ exchange. Additional correction by Regge cuts, $\rho$-$f_2$ and $\rho$-Pomeron, agree with differential cross sections and new trajectory for the $\rho'(1450)$ exchange is attempted to reproduce polarization data. For the description of elastic scattering data up to pion momentum $P_{\rm Lab}\approx 250$ GeV/c, Pomeron exchange of the Donnachie-Landshoff type is newly constructed and applied in this work. Elastic cross section data are well reproduced with the dominance of $f_2$ and Pomeron exchanges in intermediate and high energies. Analysis of nucleon resonances is presented to test the validity of the present Regge framework below $W\leq2$ GeV.