Parton Distributions for the LHC

Abstract

We present a preliminary set of updated NLO parton distributions. For the first time we have a quantitative extraction of the strange quark and antiquark distributions and their uncertainties determined from CCFR and NuTeV dimuon cross sections. Additional jet data from HERA and the Tevatron improve our gluon extraction. Lepton asymmetry data and neutrino structure functions improve the flavour separation, particularly constraining the down quark valence distribution.

Figures (4)

• Figure 1: The distribution $xd_V(x,10\,{\rm GeV}^2)$.
• Figure 2: The input distributions $s^+(x,Q_0^2)$ (left) and $s^-(x,Q_0^2)$ (right).
• Figure 3: The fit to the CDF Run II jet data.
• Figure 4: The distribution $xg(x,2\,{\rm GeV}^2)$.