Can LHC observe an anomaly in ttZ production?

Abstract

The cross section for production at the 7 TeV LHC has been measured. For the first time it therefore becomes possible to measure Z couplings to top quarks. Interpreting the notorious LEP1 anomaly on Z couplings to b quarks in terms of an extra-dimension model, one expects an excess, as large as a factor 2, on the rate which may already become significant with the LHC at 8 TeV data. Other schemes are reviewed which also predict deviations of couplings. The size of the effect and a dramatic increase of the top quarks with the right chirality should confirm our interpretation of the underlying mechanism. Complementary signals observable at LHC are also briefly reviewed.

arXiv comment7 pages, 2 figures

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• Measurement of associated production of vector bosons and top quark-antiquark pairs at sqrt(s) = 7 TeV
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Cited by in corpus (4)

• Probing top-Z dipole moments at the LHC and ILC
• Present and future constraints on top EW couplings
• Limits on the anomalous $Wtq$ couplings
• Measurement of the inclusive and differential $\mathrm{t}\overline{\mathrm{t}}\gamma$ cross sections in the single-lepton channel and EFT interpretation at $\sqrt{s}$ = 13 TeV