CERN Accelerating science

Report number	arXiv:1710.06737 ; TTK-17-17 ; IFIC-17-26 ; ILD-PHYS-2017-001 ; CLICDP-PUB-2017-003
Title	CP-violating top quark couplings at future linear $e^+e^-$ colliders
Author(s)	Bernreuther, Werner (RWTH Aachen U.) ; Chen, Long (RWTH Aachen U. ; Munich, Max Planck Inst.) ; García, Ignacio (Valencia U., IFIC ; CERN) ; Perello Rosello, Martin (Valencia U., IFIC) ; Poeschl, Roman (Orsay, LAL) ; Richard, Francois (Orsay, LAL) ; Ros, Eduardo (Valencia U., IFIC) ; Vos, Marcel (Valencia U., IFIC)
Publication	2018-02-23
Imprint	2017-12-20
Number of pages	26
Published in:	Eur. Phys. J. C 78 (2018) 155
DOI	10.1140/epjc/s10052-018-5625-3
Subject category	Particle Physics - Experiment ; Particle Physics - Phenomenology
Accelerator/Facility, Experiment	CLIC
Study	CLICdp
Abstract	We study the potential of future lepton colliders to probe violation of the CP symmetry in the top quark sector. In certain extensions of the Standard Model, such as the two-Higgs-doublet model (2HDM), sizeable anomalous top quark dipole moments can arise, that may be revealed by a precise measurement of top quark pair production. We present results from detailed Monte Carlo studies for the ILC at 500 GeV and CLIC at 380 GeV and use parton level simulations to explore the potential of high-energy operation. We find that precise measurements in $e^+e^- \rightarrow t \bar{t}$ production with subsequent decay to lepton plus jets final states can provide sufficient sensitivity to detect Higgs-boson-induced CP violation in a viable two-Higgs-doublet model. The potential of a linear $e^+e^-$ collider to detect CP-violating electric and weak dipole form factors of the top quark exceeds the prospects of the HL-LHC by over an order of magnitude.
Other source	Inspire
Copyright/License	publication: © 2018-2024 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³ preprint: (License: CC-BY-4.0)
Submitted by	[email protected]