https://doi.org/10.1140/epjc/s10052-020-7689-0
Regular Article - Theoretical Physics
Lepton collider indirect signatures of dark CP-violation
1
Instituto de Física and Facultad de Ciencias de la Electrónica, Benemérita Universidad Autónoma de Puebla, Apdo. Postal 542, C.P. 72570, Puebla, Mexico
2
Department of Physics and Helsinki Institute of Physics, University of Helsinki, Gustaf Hallstromin katu 2, 00014, Helsinki, Finland
3
School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK
4
Particle Physics Department, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, UK
5
Faculty of Physics, University of Warsaw, Pasteura 5, 02-093, Warsaw, Poland
6
International Institute of Physics, Universidade Federal do Rio Grande do Norte, Campus Universitario, Lagoa Nova, Natal, RN, 59078-970, Brazil
* e-mail: Venus.Keus@helsinki.fi
Received:
4
July
2019
Accepted:
28
January
2020
Published online:
17
February
2020
We study an extension of the Standard Model (SM) in which two copies of the SM Higgs doublet are added to the scalar sector. These extra doublets do not develop a vacuum expectation value, hence, they are inert. This essentially leads to a 3-Higgs Doublet Model (3HDM) with 2 inert and 1 active scalar doublets, which we denote as I(2+1)HDM. We allow for CP-violation in the inert sector, where the lightest inert state is protected from decaying to SM particles through the conservation of a 
symmetry, so that it is a Dark Matter (DM) candidate. For this scenario, we identify a smoking gun signature of dark CP-violation in the form of production thresholds of pairs of inert neutral Higgs bosons at an 
collider.
© The Author(s), 2020
