Speaker
Dr
Roman Nevzorov
(University of Glasgow)
Description
Multiple point principle (MPP) postulates the existence of as many phases with the
same energy density as possible, which are allowed by a given theory. Being applied
to the non--supersymmetric two-Higgs doublet extension of the Standard Model (SM) MPP
leads to the invariance of the quartic part of the Higgs effective potential and
Yukawa interactions between Higgs doublets and fermions under Peccei-Quinn symmetry.
As a result MPP ensures the CP conservation in the Higgs sector and the absence of
flavour changing neutral currents in the considered model. The existence of a large
set of degenerate vacua at some high energy scale ($\Lambda$) also results in a few
relations between Higgs self-coupling constants which can be examined at future
colliders. The numerical analysis reveals that these MPP conditions constrain
the mass of the SM--like Higgs boson to lie below 180 GeV for a wide set of the MPP
scales $\Lambda$ and $\tan\beta$.
Author
Dr
Roman Nevzorov
(University of Glasgow)
Co-authors
Prof.
Colin Froggatt
(University of Glasgow)
Prof.
Holger Nielsen
(Niels Bohr Institute)