Phenomenological studies of top-pair production at NLO

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Top Pair + 2 Jets Important background for Higgs searches @ Tevatron and @ LHC H WW ∗ produced via weak boson fusion For m H ~ 130 GeV, i.e. when BR(H WW ∗ ) is large enough Higgs boson mass peak cannot be directly reconstructed Background processes can not be measured from the side bands H bb produced via associated production with a tt pair Process useful only in the low mass range m H < 135 GeV Unique access to the top and bottom Yukawa couplings Reconstruction of the H bb mass peak difficult The bb pair can be chosen incorrectly b-tagging efficiency, two b-jets can arise from mistagged light jets Very precise knowledge of QCD backgrounds ttjj, ttbb, WWjj is necessary ! 16
Top Pair + 2 Jets Partonic subprocesses Number of Feynman diagrams Number of dipoles As a measure of complexity dσ R − dσ D dσ V Bevilacqua, Czakon, Papadopoulos, Worek ’10 ‘11 17
Page 1 and 2: Phenomenological studies of top-pai
Page 3 and 4: HELAC-NLO Group G. Bevilacqua (RWTH
Page 5 and 6: Motivation for NLO Stabilizing the
Page 7 and 8: Structure of NLO Calculations σ N
Page 9 and 10: One-loop amplitude and rational par
Page 11 and 12: Top Pair Production Complete off-s
Page 13 and 14: Top Pair Production TeVatron Diffe
Page 15: TeVatron Top Pair Production A t FB
Page 19 and 20: TeVatron Top Pair + 2 Jets Correct
Page 21 and 22: Top Pair + 2 Jets A t FB,LO = −0.
Page 23 and 24: LHC Top Pair + 2 Jets m tt 20% 30%
Page 25: Summary & Outlook Already calculat

Phenomenological studies of top-pair production at NLO

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