Top physics at CLIC and ILC

Zarnecki, Aleksander

doi:10.22323/1.282.0666

Article
Report number	CLICDP-CONF-2016-014 ; arXiv:1611.04492
Title	Top physics at CLIC and ILC
Related title	Top physics at CLIC and ILC
Author(s)	Zarnecki, Aleksander (University of Warsaw (PL))
Publication	SISSA, 2016-11-11
Imprint	2016-11-11
Number of pages	6
Note	Comments: 6 pages, 2 figures, submitted to proceedings of ICHEP'2016, presented on behalf of the CLICdp collaboration and the ILC Physics and Detector Study 6 pages, 2 figures, submitted to proceedings of ICHEP'2016, presented on behalf of the CLICdp collaboration and the ILC Physics and Detector Study
In:	PoS ICHEP2016 (2016) 666
In:	38th International Conference on High Energy Physics, Chicago, IL, USA, 03 - 10 Aug 2016, pp.666
DOI	10.22323/1.282.0666
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CLIC
Study	CLICdp
Free keywords	Top quark ; Linear Colliders ; ILC ; CLIC
Abstract	Measurements of top quark production at $e^+e^-$ colliders can provide a leap in precision in our knowledge of top quark properties and open a new window on physics beyond the Standard Model. In this contribution the top quark physics prospects of linear colliders is reviewed. Progress in detailed full-simulation studies is reported for the highlights of the program. We present the prospects for a measurement of the top quark mass and width in a scan of the beam energy through the pair production threshold, and discuss new studies of alternative measurements in continuum production, which are also capable of a precise determination of the mass in a rigorously defined mass scheme. A precision of 50 MeV on the $\overline{MS}$ mass is expected when taking into account the dominant systematic uncertainties. Another key measurement is the study of the top quark couplings to electroweak gauge bosons, where form factors can be determined to 1% precision, an order of magnitude better than those from the full LHC program. New results extend the prospects to different center-of-mass energies and to CP violating form factors. Finally, new studies are presented indicating the possibility to detect Flavour Changing Neutral Current decays of the top quark at linear colliders, such as the decay $t \rightarrow cH$, to a branching ratio of $BR(t\rightarrow cH) \sim 10^{-5}$.
Copyright/License	arXiv nonexclusive-distrib. 1.0 Preprint: (License: CC-BY-4.0)

$Simulated cross section measurements for top pair production at the threshold (background subtracted) with the luminosity spectra expected for ILC (left) and CLIC (right). Threshold scan with measurements at 10 energy points with 10 fb$^{-1}$ each, simulated for the generator mass of 174 GeV (full line) as well as for a shift in mass of $\pm$200 MeV (dotted lines). Figure taken from \cite{Seidel:2013sqa}.$ $Simulated cross section measurements for top pair production at the threshold (background subtracted) with the luminosity spectra expected for ILC (left) and CLIC (right). Threshold scan with measurements at 10 energy points with 10 fb$^{-1}$ each, simulated for the generator mass of 174 GeV (full line) as well as for a shift in mass of $\pm$200 MeV (dotted lines). Figure taken from \cite{Seidel:2013sqa}.$