Improved Measurement of ttZ Couplings at the LHC
U. Baur, A. Juste, D. Rainwater, L. H. Orr
Abstract
We consider QCD tt~Z production at the LHC with Z->ννand all-hadronic tt~ decays, i.e. pp -> pT(miss)bb~+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, tt~j and tt~jj 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 pT(miss)bb~+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.
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