Analysis of deep inelastic scattering with $z$-dependent scale

Details Analysis of deep inelastic scattering with $z$-dependent scale Analysis of deep inelastic scattering with $z$-dependent scale

1999-04-13

arxiv.org/abs/hep-ph/9904317v1

Eur.Phys.J.C10:697-702,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages including 5 figures

Scientific paper

10.1007/s100529900133

Evolution of the parton densities at NLO in $\alpha_S$ using $\tilde W^2 = Q^2 (1-z)/z$ instead of the usual $Q^2$ for the scale of the running coupling $\alpha_S$ is investigated. While this renormalisation scale change was originally proposed as the relevant one for $x \to 1$, we explore the consequences for all $x$ with this choice. While it leads to no improvement to the description of DIS data, the nature of the gluon at low $x$, low $Q^2$ is different, avoiding the need for a `valence-like' gluon.

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