Total Top-Quark Pair-Production Cross Section at Hadron Colliders Through O(αS4)
Abstract
We compute the next-to-next-to-leading order (NNLO) quantum chromodynamics (QCD) correction to the total cross section for the reaction gg→tt¯+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 pair-production cross section at hadron colliders. Supplementing the fixed order results with soft-gluon resummation with next-to-next-to-leading 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
- E-Print:
- 6 pages, 4 figures