Production of t anti-t b anti-b at the LHC at NLO QCD

Details Production of t anti-t b anti-b at the LHC at NLO QCD Production of t anti-t b anti-b at the LHC at NLO QCD

2010-06-14

arxiv.org/abs/1006.2653v1

Nucl.Phys.Proc.Suppl.205-206:80-85,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 8 postscript figures, to appear in proceedings of the "10th DESY Workshop on Elementary Particle Theory: Loops and Le

Scientific paper

10.1016/j.nuclphysbps.2010.08.02

We summarise predictions for top anti-top bottom anti-bottom (tTbB) production at the LHC in next-to-leading order QCD. The precise description of this background process is a prerequisite to observe associated top anti-top Higgs production in the H -> bottom anti-bottom decay channel. The one-loop amplitudes are computed using Feynman diagrams and numerical tensor reduction. This approach provides very high numerical stability and CPU efficiency. We find that the scale choice adopted in ATLAS simulations underestimates the tTbB background by a factor two and introduce a new dynamical scale that stabilises the perturbative predictions. In the regime of highly boosted Higgs bosons, which offers better perspectives to observe the tTH(H-> bB) signal, the corrections induce significant distortions in the kinematic distributions.

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