Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-06-04
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.
Martin A. D.
Stirling James W.
Thorne Robert S.
Watt George
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