Snowmass White Paper: prospects for the measurement of top-quark couplings

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Preprint
Report number	arXiv:2205.02140
Title	Snowmass White Paper: prospects for the measurement of top-quark couplings
Author(s)	Durieux, Gauthier (CERN) ; Camacho, Abel Gutiérrez (Valencia U., IFIC) ; Mantani, Luca (Cambridge U., DAMTP) ; Miralles, Víctor (Valencia U., IFIC ; INFN, Rome) ; López, Marcos Miralles (Valencia U., IFIC) ; Llácer Moreno, María (Valencia U., IFIC) ; Poncelet, René (Cambridge U.) ; Vryonidou, Eleni (Manchester U.) ; Vos, Marcel (Valencia U., IFIC)
Imprint	2022-05-04
Number of pages	35
Note	Contribution Snowmass 2021
Presented at	2021 Snowmass Summer Study, Seattle, WA, United States, 11 - 20 July 2021, pp.
Subject category	hep-ph ; Particle Physics - Phenomenology
Abstract	In this contribution to the 2021 Snowmass community planning exercise that informs the American strategy for particle physics, we present the prospects for measurements of the top-quark couplings at future colliders. Projections are presented for the high luminosity phase of the Large Hadron Collider and a future Higgs/electroweak/top factory electron-positron collider. Results are presented for the expected bounds on Wilson coefficients of the relevant SMEFT operators from a global fit to the top physics sector.
Other source	Inspire
Copyright/License	preprint: (License: CC BY 4.0)

$The 95\% probability bounds on the Wilson coefficients for dimension-six operators that affect the top-quark production and decay measurements listed in Table~\ref{tab:measurements} after run 2 of the LHC (in dark red) and prospects for the bounds expected after completion of the complete LHC program, including the high-luminosity stage (in light red). Only linear terms proportional to $\Lambda^{-2}$ are taken into account in the dependence of the observables on the Wilson coefficients. The individual bounds obtained from a single-parameter fit are shown as solid bars, while the global or marginalised bounds obtained fitting all Wilson coefficients at once are indicated by the full bars (shaded region in each bar). The correlations between the Wilson coefficients obtained in the global fit can be found in App.~\ref{app:correlation_matrices}.$ $Comparison of current LHC constraints with HL-LHC ones, and those deriving from ILC runs at 250, 500 and 1000~GeV. The limits on the $q\bar{q}t\bar{t}$ and $C_{tG}$ coefficients are not shown, since the $e^+e^-$ collider measurements considered are not sensitive to them, but all operators are included in the global fit. The improvement expected from the HL-LHC on these coefficients is shown in Fig.~\ref{fig:hllhc_projection}. The solid bars provide the individual limits of the single-parameter fit and the shaded ones the marginalised limits of the global fit. The correlations between the Wilson coefficients obtained in the global fit can be found in App.~\ref{app:correlation_matrices}.$ $Comparison of the constraints expected from a combination of HL-LHC and lepton collider data. The limits on the $q\bar{q}t\bar{t}$ and $C_{tG}$ coefficients are not shown, since the $e^+e^-$ collider measurements considered are not sensitive to them, but all operators are included in the global fit. The improvement expected from the HL-LHC on these coefficients is shown in Fig.~\ref{fig:hllhc_projection}. The solid bars provide the individual limits of the single-parameter fit and the shaded ones the marginalised limits of the global fit. The correlations between the Wilson coefficients obtained in the global fit can be found in App.~\ref{app:correlation_matrices}.$ Show more plots

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