Update of Parton Distributions at NNLO

Details Update of Parton Distributions at NNLO Update of Parton Distributions at NNLO

2007-06-04

arxiv.org/abs/0706.0459v3

Phys.Lett.B652:292-299,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 11 figures. Version published. Slight extension and some modification of references

Scientific paper

10.1016/j.physletb.2007.07.040

We present a new set of parton distributions obtained at NNLO. These differ from the previous sets available at NNLO due to improvements in the theoretical treatment. In particular we include a full treatment of heavy flavours in the region near the quark mass. In this way, an essentially complete set of NNLO partons is presented for the first time. The improved treatment leads to a significant change in the gluon and heavy quark distributions, and a larger value of the QCD coupling at NNLO, alpha_S(M_Z^2) = 0.1191 +/- 0.002(expt.) +/- 0.003(theory). Indirectly this also leads to a change in the light partons at small x and modifications of our predictions for W and Z production at the LHC. As well as the best-fit set of partons, we also provide 30 additional sets representing the uncertainties of the partons obtained using the Hessian approach.

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