Next-to-Leading Order QCD Predictions for W+3-Jet Distributions at Hadron Colliders

Details Next-to-Leading Order QCD Predictions for W+3-Jet Distributions at Hadron Colliders Next-to-Leading Order QCD Predictions for W+3-Jet Distributions at Hadron Colliders

2009-07-11

arxiv.org/abs/0907.1984v2

Phys.Rev.D80:074036,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

64 pages, 37 figures, v2 minor changes in table X, cross sections and distributions unaffected; other minor corrections to tex

Scientific paper

10.1103/PhysRevD.80.074036

We present next-to-leading order QCD predictions for a variety of distributions in W+3-jet production at both the Tevatron and the Large Hadron Collider. We include all subprocesses and incorporate the decay of the W boson into leptons. Our results are in excellent agreement with existing Tevatron data and provide the first quantitatively precise next-to-leading order predictions for the LHC. We include all terms in an expansion in the number of colors, confirming that the specific leading-color approximation used in our previous study is accurate to within three percent. The dependence of the cross section on renormalization and factorization scales is reduced significantly with respect to a leading-order calculation. We study different dynamical scale choices, and find that the total transverse energy is significantly better than choices used in previous phenomenological studies. We compute the one-loop matrix elements using on-shell methods, as numerically implemented in the BlackHat code. The remaining parts of the calculation, including generation of the real-emission contributions and integration over phase space, are handled by the SHERPA package.

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