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A precise characterisation of the top quark electro-weak vertices at the ILC

Abstract : Top quark production in the process $e^+e^- \to t\bar{t}$ at a future linear electron positron collider with polarised beams is a powerful tool to determine indirectly the scale of new physics. The presented study, based on a detailed simulation of the ILD detector concept, assumes a centre-of-mass energy of $\sqrt{s}=500\,$GeV and a luminosity of $\mathcal{L}=500\,{\rm fb}^{-1}$ equally shared between the incoming beam polarisations of $\mathcal{P}_{e^-}, \mathcal{P}_{e^+} =\pm0.8,\mp0.3$. Events are selected in which the top pair decays semi-leptonically and the cross sections and the forward-backward asymmetries are determined. Based on these results, the vector, axial vector and tensorial $CP$ conserving couplings are extracted separately for the photon and the $Z^0$ component. With the expected precision, a large number of models in which the top quark acts as a messenger to new physics can be distinguished with many standard deviations. This will dramatically improve expectations from e.g. the LHC for electro-weak couplings of the top quark.
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Contributor : Sabine Starita <>
Submitted on : Tuesday, May 26, 2015 - 11:12:22 AM
Last modification on : Wednesday, September 16, 2020 - 4:28:27 PM

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M. S. Amjad, S. Bilokin, M. Boronat, P. Doublet, T. Frisson, et al.. A precise characterisation of the top quark electro-weak vertices at the ILC. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2015, 75 (10), pp.512. ⟨10.1140/epjc/s10052-015-3746-5⟩. ⟨in2p3-01155133⟩



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