Updating an empirical analysis on the proton's central opacity and asymptotia

TL;DR

This paper updates an empirical analysis of proton scattering data from 5 GeV to 8 TeV, exploring asymptotic limits and favoring a gray disk scenario with a ratio of 1/3, including recent ATLAS data.

Contribution

It provides an updated empirical analysis with a new dataset and investigates asymptotic scenarios, favoring a gray disk limit over the black disk.

Findings

Supports a gray disk limit with a ratio of 1/3

Includes recent ATLAS 7 TeV data

Provides bounds on diffractive to inelastic cross section ratios

Abstract

We present an updated empirical analysis on the ratio of the elastic (integrated) to the total cross section in the c.m. energy interval from 5 GeV to 8 TeV. As in a previous work, we use a suitable analytical parametrization for that ratio (depending on only four free fit parameters) and investigate three asymptotic scenarios: either the black disk limit or scenarios above or below that limit. The dataset includes now the datum at 7 TeV, recently reported by the ATLAS Collaboration. Our analysis favors, once more, a scenario below the black disk, providing an asymptotic ratio consistent with the rational value 1/3, namely a gray disk limit. Upper bounds for the ratio of the diffractive (dissociative) to the inelastic cross section are also presented.