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The C2HDM revisited
Fontes, Duarte; Muehlleitner, Milada Margarete; Romão, Jorge; Santos, Rui; Silva, Joao; Wittbrodt, JonasThe complex two-Higgs doublet model is one of the simplest ways to extend the scalar sector of the Standard Model to include a new source of CP-violation. The model has been used as a benchmark model to search for CP-violation at the LHC and as a possible explanation for the matter-antimatter asymmetry of the Universe. In this work, we re-analyse in full detail the softly broken ℤ2 symmetric complex two-Higgs d...
The C2HDM revisited
Fontes, Duarte; Mühlleitner, Margarete; Romão, Jorge C.; Santos, Rui; Silva, João P.; Wittbrodt, JonasThe complex two-Higgs doublet model is one of the simplest ways to extend the scalar sector of the Standard Model to include a new source of CP-violation. The model has been used as a benchmark model to search for CP-violation at the LHC and as a possible explanation for the matter-antimatter asymmetry of the Universe. In this work, we re-analyse in full detail the softly broken $\mathbb{Z}_2$ symmetric complex...
Large pseudoscalar Yukawa couplings in the complex 2HDM
Fontes, Duarte; Romão, Jorge C.; Santos, Rui; Silva, João P.We start by presenting the current status of a complex flavour conserving two-Higgs doublet model. We will focus on some very interesting scenarios where unexpectedly the light Higgs couplings to leptons and to b-quarks can have a large pseudoscalar component with a vanishing scalar component. Predictions for the allowed parameter space at end of the next run with a total collected luminosity of 300 fb(-1) and ...
Undoubtable signs of CP-violation in Higgs boson decays at the LHC run 2
Fontes, Duarte; Romão, Jorge C.; Santos, Rui; Silva, João P.With the discovery of the Higgs boson at the Large Hadron Collider the high energy physics community's attention has now turned to understanding the properties of the Higgs boson, together with the hope of finding more scalars during run 2. In this work we discuss scenarios where using a combination of three decays, involving the 125 GeV Higgs boson, the Z boson and at least one more scalar, an indisputable sig...
H → Zr in the complex two Higgs doublet model
Fontes, Duarte; Romão, J. C.; Silva, João PauloThe latest LHC data confirmed the existence of a Higgs-like particle and made interesting measurements on its decays into gamma gamma, ZZ*, WW*, tau(+)tau(-), and b (b) over bar. It is expected that a decay into Z gamma might be measured at the next LHC round, for which there already exists an upper bound. The Higgs-like particle could be a mixture of scalar with a relatively large component of pseudoscalar. We...
Reappraisal of the wrong-sign HBB¯ coupling and the study of h→Zγ
Fontes, Duarte; Romão, J. C.; Silva, João PauloIt has been pointed out recently that current experiments still allow for a two Higgs doublet model where the hbb¯ coupling (kDmb/v) is negative; a sign opposite to that of the Standard Model. Due to the importance of delayed decoupling in the hH+H− coupling, h→γγ improved measurements will have a strong impact on this issue. For the same reason, measurements or even bounds on h→Zγ are potentially interesting. ...