MRST Parton Distributions -- status 2006

Abstract

We present the new preliminary MRST parton distributions at NLO and NNLO. The analysis includes some new data and there is an improvement in the theoretical treatment at NNLO. Essentially complete NNLO partons are presented for the first time, together with uncertainties.

Figures (3)

• Figure 1: Comparison of the NLO up distribution with the NNLO up distribution, concentrating on small $x$ (left) and high $x$ (right).
• Figure 2: Comparison of the NNLO MRST gluon distribution with the previous approximate NNLO distribution (left) and the NNLO distribution of Alekhin (right).
• Figure 3: Comparison of the NLO MRST Drell-Yan cross-sections with the data.