Threshold expansion at order αs4 for the tt¯ invariant mass distribution at hadron colliders
- Resource Type
- Authors
- Valentin Ahrens; Matthias Neubert; Andrea Ferroglia; Ben D. Pecjak; Li Lin Yang
- Source
- Physics Letters B. 687:331-337
- Subject
- Physics
Nuclear and High Energy Physics
Particle physics
Large Hadron Collider
Mass distribution
High Energy Physics::Phenomenology
Hadron
Tevatron
Nuclear physics
Distribution (mathematics)
High Energy Physics::Experiment
Invariant mass
Center of mass
Invariant (mathematics)
- Language
- ISSN
- 0370-2693
We calculate the leading O ( α s 4 ) contributions to the invariant mass distribution of top-quark pairs produced at the Tevatron and LHC, in the limit where the invariant mass of the t t ¯ pair approaches the partonic center-of-mass energy. Our results determine at NNLO in α s the coefficients of all singular plus distributions and scale-dependent logarithms in the differential partonic cross sections for q q ¯ , g g → t t ¯ + X . A numerical analysis showing the effects of the NNLO corrections on the central values and scale dependence of the invariant mass distribution is performed. The NNLO corrections are found to significantly enhance the cross section and reduce the perturbative uncertainties compared to the NLO calculation.