Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-07-08
JHEP 0808:108,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
30 pages, LaTeX, 12 postscript figures
Scientific paper
10.1088/1126-6708/2008/08/108
The process pp -> top anti-top bottom anti-bottom + X represents a very important background reaction to searches at the LHC, in particular to top anti-top H production where the Higgs boson decays into a bottom anti-bottom pair. A successful analysis of top anti-top H at the LHC requires the knowledge of direct top anti-top bottom anti-bottom production at next-to-leading order in QCD. We take the first step in this direction upon calculating the next-to-leading-order QCD corrections to the subprocess initiated by quark anti-quark annihilation. We devote an appendix to the general issue of rational terms resulting from ultraviolet or infrared (soft or collinear) singularities within dimensional regularization. There we show that, for arbitrary processes, in the Feynman gauge, rational terms of infrared origin cancel in truncated one-loop diagrams and result only from trivial self-energy corrections.
Bredenstein Axel
Denner Ansgar
Dittmaier Stefan
Pozzorini Stefano
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