The ALLM parameterization of sigma_{tot}(gamma* p) - an update

TL;DR

The paper updates the ALLM parameterization of the total gamma* p cross section using comprehensive F_2 data, resulting in a model that accurately describes data across a wide range of x and Q^2 values.

Contribution

The paper introduces the ALLM97 parameterization, an improved model based on all published F_2 data, providing a better fit for gamma* p interactions over extensive kinematic ranges.

Findings

Achieved a chi^2/ndf of 0.97 with 1356 data points.

The ALLM97 model describes data across 3×10^{-6} < x < 0.85 and 0 ≤ Q^2 < 5000 GeV^2.

Provides a unified description of gamma* p cross sections over a broad kinematic range.

Abstract

The ALLM parameterization of sigma_{tot}(gamma* p) has been updated by using all published F_2 data to determine its parameters. The fit yields a chi^2/ndf of 0.97 for the 1356 data points. The updated ALLM parameterization, ALLM97, gives a good description of all the available data in the whole x and Q^2 range studied so far (3\times10^{-6} < x < 0.85, 0 \le Q^2 < 5000 GeV^2).