https://doi.org/10.1140/epjc/s10052-018-5651-1
Regular Article - Theoretical Physics
Status of the charged Higgs boson in two Higgs doublet models
1
Univ Lyon, Univ Lyon 1, ENS de Lyon, CNRS, Centre de Recherche Astrophysique de Lyon UMR5574, 69230, Saint-Genis-Laval, France
2
Univ Lyon, Univ Lyon 1, CNRS/IN2P3, Institut de Physique Nucléaire de Lyon UMR5822, 69622, Villeurbanne, France
3
CERN, Theoretical Physics Department, 1211, Geneva 23, Switzerland
4
Lakegatan 6, 723 49, Westeros, Sweden
5
Santa Cruz Institute For Particle Physics (SCIPP) and Department of Physics, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA, 95064, USA
* e-mail: nazila@cern.ch
Received:
18
July
2017
Accepted:
14
February
2018
Published online:
5
March
2018
The existence of charged Higgs boson(s) is inevitable in models with two (or more) Higgs doublets. Hence, their discovery would constitute unambiguous evidence for new physics beyond the Standard Model (SM). Taking into account all relevant results from direct charged and neutral Higgs boson searches at LEP and the LHC, as well as the most recent constraints from flavour physics, we present a detailed analysis of the current phenomenological status of the charged Higgs sector in a variety of well-motivated two Higgs doublet models (2HDMs). We find that charged Higgs bosons as light as 
can still be compatible with the combined data, although this implies severely suppressed charged Higgs couplings to all fermions. In more popular models, e.g. the 2HDM of Type II, we find that flavour physics observables impose a combined lower limit on the charged Higgs mass of 
GeV – independent of 
– which increases to 
GeV for 
. We furthermore find that in certain scenarios, the signature of a charged Higgs boson decaying into a lighter neutral Higgs boson and a W boson provides a promising experimental avenue that would greatly complement the existing LHC search programme for charged Higgs boson(s).
© The Author(s), 2018
