Improved measurement ofttZcouplings at the CERN LHC
Citations Over TimeTop 10% of 2006 papers
Abstract
We consider QCD $t\overline{t}Z$ production at the LHC with $Z\ensuremath{\rightarrow}\overline{\ensuremath{\nu}}\ensuremath{\nu}$ and all-hadronic $t\overline{t}$ decays, i.e. $pp\ensuremath{\rightarrow}{\mathrm{p\ensuremath{\llap{\not\;}}}}_{T}b\overline{b}+4$ 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, $t\overline{t}$, $b\overline{b}+4$ jet, $t\overline{t}j$, and $t\overline{t}jj$ 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 ${\mathrm{p\ensuremath{\llap{\not\;}}}}_{T}b\overline{b}+4$ 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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