NNLO Calculation of DIS; Precision Determination of the Strong Coupling Constant, Extraction of the Gluon Density, and Comments on "Hidden" Gluinos

TL;DR

This paper presents NNLO calculations for deep inelastic scattering, providing a precise determination of the strong coupling constant and gluon density, while also commenting on the non-existence of light gluinos.

Contribution

It offers the first NNLO analysis of DIS data to accurately extract the strong coupling and gluon density, with implications for supersymmetric particles.

Findings

_s(M_Z^2)=0.1163b10.0023

Gluon density modeled as 0.51 x^{-0.44}(1-x)^{8.1} at 10 GeV^2

No evidence found for light gluinos

Abstract

Calculations of deep inelastic processes (DIS) to next-to-next to leading order are discussed. Fitting $ep$ experiment in the range $2.5\leq Q^2\leq 230 GeV^2$, we find the coupling $\alpha_s(M_Z^2)=0.1163\pm0.0023$. We also get the gluon density $xG(x,Q^2\simeq 10 GeV^2)=0.51 x^{-0.44}(1-x)^{8.1}$, and negative evidence for the existence of light gluinos