Phenomenological studies of top-pair production at NLO

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LHC Top Pair + 2 Jets NLO QCD corrections are negative and relatively constant Angular distributions 20% 30% corrections Bevilacqua, Czakon, Papadopoulos, Worek ’1o ‘11 24
Summary & Outlook Already calculated by HELAC-NLO: ttbb, ttjj, Htt, WWbb ttbb, WWbb completed by two groups Permille level agreement in both cases! Much wider study for ttjj: variation of the center of mass energy, jet algorithms, cone size in jet algorithm, transverse momentum cuts HELAC-NLO Complete tool at NLO built around HELAC‐PHEGAS: HELAC‐1LOOP, CUTTOOLS, ONELOOP, HELAC‐DIPOLES Other processes from NLO Wishlist under attack Constant improvements in speed and functionality Interfaced to PYTHIA and HERWIG showers via POWHEG-BOX: ttj, ttH Decays of massive particles, showering and hadronization Final results at the hadron level http://helac-phegas.web.cern.ch/helac-phegas/ 25
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 and 16: TeVatron Top Pair Production A t FB
Page 17 and 18: Top Pair + 2 Jets Partonic subproc
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: LHC Top Pair + 2 Jets m tt 20% 30%

Phenomenological studies of top-pair production at NLO

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