Complete off-shell effects in top quark pair hadroproduction with leptonic decay at next-to-leading order
arXiv:1012.4230 · doi:10.1007/JHEP02(2011)083
Abstract
Results for next-to-leading order QCD corrections to the pp(p\bar{p}) -> t \bar{t} -> W^+W^- b\bar{b} -> e^{+} ν_{e} μ^{-} \barν_μ b \bar{b} +X processes with complete off-shell effects are presented for the first time. Double-, single- and non-resonant top contributions of the order {\cal{O}}(α_{s}^3 α^4) are consistently taken into account, which requires the introduction of a complex-mass scheme for unstable top quarks. Moreover, the intermediate W bosons are treated off-shell. Comparison to the narrow width approximation for top quarks, where non-factorizable corrections are not accounted for is performed. Besides the total cross section and its scale dependence, several differential distributions at the TeVatron run II and the LHC are given. In case of the TeVatron the forward-backward asymmetry of the top is recalculated afresh. With inclusive selection cuts, the forward-backward asymmetry amounts to A^{t}_{FB} = 0.051 +/- 0.0013. Furthermore, the corrections with respect to leading order are positive and of the order 2.3% for the TeVatron and 47% for the LHC. A study of the scale dependence of our NLO predictions indicates that the residual theoretical uncertainty due to higher order corrections is 8% for the TeVatron and 9% for the LHC.
35 pages, 39 figures, 3 tables. References and note added, version to appear in JHEP
References in corpus (29)
- A parton shower algorithm based on Catani-Seymour dipole factorisation
- Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
- Reducing full one-loop amplitudes to scalar integrals at the integrand level
- OneLOop: for the evaluation of one-loop scalar functions
- Assault on the NLO Wishlist: pp -> tt bb
- Next-to-next-to-leading soft-gluon corrections for the top quark cross section and transverse momentum distribution
- NLO QCD corrections to t tbar + jet production at hadron colliders
- NLO QCD corrections to pp -> t anti-t b anti-b + X at the LHC
- NLO QCD corrections to WWbb production at hadron colliders
- Top Quarks, Axigluons and Charge Asymmetries at Hadron Colliders
- Helac-Phegas: a generator for all parton level processes
- Tops from Light Quarks: Full Mass Dependence at Two-Loops in QCD
- Two-loop soft anomalous dimensions and NNLL resummation for heavy quark production
- Next-to-leading order QCD corrections to t-tbar-Z production at the LHC
- Polarizing the Dipoles
- Threshold Resummation for Top-Pair Hadroproduction to Next-to-Next-to-Leading Log
- Hadronic top-quark pair production in association with a hard jet at next-to-leading order QCD: Phenomenological studies for the Tevatron and the LHC
- Two-Loop Fermionic Corrections to Heavy-Quark Pair Production: the Quark-Antiquark Channel
- Inclusive Heavy Flavor Hadroproduction in NLO QCD: the Exact Analytic Result
- Two-Loop Planar Corrections to Heavy-Quark Pair Production in the Quark-Antiquark Channel
- Parton showers from the dipole formalism
- Next-to-Leading-Order QCD corrections to J/ψ(Υ)+γproduction at the LHC
- Two-Loop Leading Color Corrections to Heavy-Quark Pair Production in the Gluon Fusion Channel
- The one-loop gluon amplitude for heavy-quark production at NNLO
- Heavy quark pair production in gluon fusion at next-to-next-to-leading order: One-loop squared contributions
- On the Soft-Gluon Resummation in Top Quark Pair Production at Hadron Colliders
- Observing Strongly Interacting Vector Boson Systems at the CERN Large Hadron Collider
- PARNI for importance sampling and density estimation
- NLO QCD corrections to pp->WW+jet+X