850 research outputs found
Z+jet production at NNLO
We give a brief overview of our calculation of the next-to-next-to-leading
order (NNLO) QCD corrections to Z+jet production in hadronic collisions.
Phenomenological results are presented which comprise various differential
distributions for 8 TeV proton-proton collisions. A significant reduction of
the scale uncertainties is observed throughout as we move from NLO to NNLO. We
further discuss how this calculation can be used to describe the inclusive
Z-boson production at large transverse momentum. To this end, the theory
prediction is compared to the measurements performed by the ATLAS and CMS
collaborations at a centre-of-mass energy of 8 TeV. Here, the inclusion of NNLO
QCD effects are found to result in a substantial improvement in the agreement
between theory and data for the normalised distributions.Comment: 8 pages, 5 figures, to appear in the proceedings of Loops and Legs in
Quantum Field Theory, 24-29 April 2016, Leipzig, German
NNLO QCD corrections to event shape variables in electron positron annihilation
Precision studies of QCD at electron-positron colliders are based on
measurements of event shapes and jet rates. To match the high experimental
accuracy, theoretical predictions to next-to-next-to-leading order (NNLO) in
QCD are needed for a reliable interpretation of the data. We report the first
calculation of NNLO corrections O(alpha_s^3) to three-jet production and
related event shapes, and discuss their phenomenological impact.Comment: Contributed to 2007 Europhysics Conference on High Energy Physics,
Manchester, England 19-25 July 200
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