Total TopQuark PairProduction Cross Section at Hadron Colliders Through O(α_{S}^{4})
Abstract
We compute the nexttonexttoleading order (NNLO) quantum chromodynamics (QCD) correction to the total cross section for the reaction gg→tt̄+X. Together with the partonic channels we computed previously, the result derived in this Letter completes the set of NNLO QCD corrections to the total top pairproduction cross section at hadron colliders. Supplementing the fixed order results with softgluon resummation with nexttonexttoleading logarithmic accuracy, we estimate that the theoretical uncertainty of this observable due to unknown higher order corrections is about 3% at the LHC and 2.2% at the Tevatron. We observe a good agreement between the standard model predictions and the available experimental measurements. The very high theoretical precision of this observable allows a new level of scrutiny in parton distribution functions and new physics searches.
 Publication:

Physical Review Letters
 Pub Date:
 June 2013
 DOI:
 10.1103/PhysRevLett.110.252004
 arXiv:
 arXiv:1303.6254
 Bibcode:
 2013PhRvL.110y2004C
 Keywords:

 12.38.Bx;
 13.85.Lg;
 14.65.Ha;
 Perturbative calculations;
 Total cross sections;
 Top quarks;
 High Energy Physics  Phenomenology;
 High Energy Physics  Experiment
 EPrint:
 6 pages, 4 figures