Top quark electroweak couplings at future lepton colliders

Englert, C. and Russell, M. (2017) Top quark electroweak couplings at future lepton colliders. European Physical Journal C, 77(8), 535. (doi: 10.1140/epjc/s10052-017-5095-z)

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We perform a comparative study of the reach of future e+e−e+e− collider options for the scale of non-resonant new physics effects in the top quark sector, phrased in the language of higher-dimensional operators. Our focus is on the electroweak top quark pair production process e+e−→Z∗/γ→tt¯e+e−→Z∗/γ→tt¯, and we study benchmark scenarios at the ILC and CLIC. We find that both are able to constrain mass scales up to the few TeVTeV range in the most sensitive cases, improving by orders of magnitude on the forecast capabilities of the LHC. We discuss the role played by observables such as forward–backward asymmetries, and making use of different beam polarisation settings, and highlight the possibility of lifting a degeneracy in the allowed parameter space by combining top observables with precision Z-pole measurements from LEP1.

Item Type:Articles
Additional Information:MR is supported in part by the UK Science and Technology Facilities Council (STFC) under grant ST/L000446/1.
Glasgow Author(s) Enlighten ID:Russell, Mr Michael and Englert, Professor Christoph
Authors: Englert, C., and Russell, M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:European Physical Journal C
ISSN (Online):1434-6052
Published Online:10 August 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in European Physical Journal C 77(8): 535
Publisher Policy:Reproduced under a Creative Commons license
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