Elastic pp scattering from the optical point to past the dip: an empirical parametrization from ISR to LHC

TL;DR

This paper presents an empirical parametrization of elastic proton-proton scattering data from ISR to LHC energies, accurately capturing the forward peak and dip structure, and provides predictions for higher energies to test asymptotic behavior.

Contribution

The paper introduces a simple yet effective empirical model for elastic pp scattering that describes data across a wide energy range and includes predictions for future high-energy experiments.

Findings

Model reproduces LHC7 and ISR data well

Predicts the approach to the black disk limit at ultra-high energies

Incorporates proton form factor or two-pion threshold effects

Abstract

We describe the main features of recent LHC data on elastic pp scattering through a simple parametrization to the amplitude, inspired by a model proposed by Barger and Phillips in 1973, comprising of two exponentials with a relative phase. Despite its simplicity, this parameterization reproduces two essential aspects of the elastic differential cross section, the well known precipitous descent in the forward direction and a sharp `dip' structure. To include a complete description of data sets near -t=0, we correct the original parametrization. We examine two possibilities, the presence of the two-pion threshold singularity or a multiplicative factor reflecting the proton form factor. We find good descriptions of LHC7 and ISR data in either case. The form factor model allows simple predictions for higher energies through asymptotic theorems and asymptotic sum rules in impact parameter space. We present predictions for this model at higher LHC energies, which can be used to test whether asymptotia is reached. The black disk limit in this model is seen to be reached only for energies near 10^6 TeV.