2005/12/20 by U. Baur, A. Juste, D. Rainwater +2
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.73.034016
published as Phys.Rev.D73:034016,2006 · revtex4, 16 pages, 4 figures, 1 table
arxiv created 2005/12/20 · openalex publication_date 2006/02/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We consider QCD ttZ production at the LHC with Z\ensuremath→\ensuremathν\ensuremathν and all-hadronic tt decays, i.e. pp\ensuremath→\mathrmp\ensuremath\llap\not Tbb+4 jets, as a tool to measure ttZ couplings. This channel has a significantly larger cross section than those where the Z boson decays leptonically. However, tt, bb+4 jet, ttj, and ttjj production give rise to potentially large backgrounds. We show that these processes can be suppressed to an acceptable level with suitable cuts, and find that adding the \mathrmp\ensuremath\llap\not Tbb+4 jet channel to the final states used in previous ttZ couplings analyses will improve the sensitivity by 10%--60%. We also discuss how the measurement of the ttZ couplings may constrain Little Higgs models.