Top-quark couplings to TeV resonances at future lepton colliders

Abstract

We study the processes $W_L{W}_L\to t\bar{t}$ and $W_L{Z}_L\to t\bar{b}(\bar{t}b)$ at future lepton colliders as probes of the couplings of the top quark to resonances at the TeV scale. We consider the cases in which the dominant low energy feature of a strongly interacting electroweak symmetry breaking sector is either a scalar or a vector resonance with mass near 1 TeV. We find that future lepton colliders with high energy and high luminosity have great potential to sensitively probe these physics scenarios. In particular, at a 1.5 TeV linear collider with an integrated luminosity of 200 fb${}^{-1}$, we expect about 120 events for either a scalar or a vector to decay to $t\bar{t},t\bar{b}$. Their leading partial decay widths, which characterize the coupling strengths, can be statistically determined to about 10% level.

33 pages, 9 ps figures, 1 table

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• Single top production at linear $e^{-}{e}^{+}$ colliders
• Top-BESS model and its phenomenology
• Study of V_LV_L to t tbar at the ILC Including O(alpha_s) QCD Corrections
• A case study about the mass exclusion limits for the BSM vector resonances with the direct couplings to the third quark generation
• Consistent Dyson summation of Higgs propagators in nonlinear parameterizations revisited