Where are the Next Higgs Bosons?

Abstract

Simple symmetry arguments applied to the third generation lead to a prediction: there exist new sequential Higgs doublets with masses of order < ∼ 5 TeV, with approximately universal Higgs-Yukawa coupling constants, g ∼ 1. This is calibrated by the known Higgs boson mass, the top quark Higgs-Yukawa coupling, and the b-quark mass. A new massive weak-isodoublet, H b , coupled to the b-quark with g ∼ 1 is predicted, and may be accessible to the LHC at 13 TeV, and definitively at the energy upgraded LHC of 26 TeV. The extension to leptons generates a new Hτ and a possible Hν τ doublet. The accessibility of the latter depends upon whether the mass of the τ -neutrino is Dirac or Majorana.

Unified interpretation of scalegenesis in conformally extended standard models: a dynamical origin of Higgs portal *

“…It is facile to see that the potential is structured on a global chiral symmetry for the two Higgs flavors, where the component is in part explicitly broken down (to the subgroup corresponding to the third component of ) by the third term and the component (that is usually called a soft-breaking term in the context of two-Higgs-doublet models) is broken by the second term. The same chiral two-Higgs sector structure (without the scale invariance) has been discussed in [78,79].…”

Top condensation model: a step towards the correct prediction of the Higgs mass

“…This is the opposite behavior as compared to the case of the standard HY couplings. In this respect it may be appropriate to notice the result of paper [15] where the additional SU (2) R symmetry has been responsible for a similar relation between the top quark coupling of the standard Higgs, g t , and the bottom quark coupling of the sequential Higgs, g b , i.e., g t = g b .…”

“…The new Higgs states are usually intended to explain the mystery of the origin of the small parameters of the SM. For instance, the new Higgs doublet can explain the origin of the observed Higgs-Yukawa coupling of the b-quark y b 0.024 [15]. This is due to the power law suppression which arises from the large mass of the new Higgs field and its mixing with the SM Higgs doublet.…”

“…The second goal of our work is to derive the expression for the mass of the sequential Higgs which appears naturally in the spectrum of the model [6]. There is a definite interest and there are quite reasonable symmetry arguments in favour of states with masses of order ≤ 5 TeV, and with approximately universal Higgs-Yukawa (HY) coupling constants, g ∼ 1 [15]. We show that predictions based on the model [6] at leading order in 1/N c do not exclude the pattern with a relatively light mass and support the universal character of the HY couplings for both Higgs states.…”

Unified Interpretation of Scalegenesis in Conformally Extended Standard Models

“…It is easy to see that the potential is built upon a global chiral U (2) L × U (2) R symmetry for the two Higgs flavors, where the SU (2) R part is in part explicitly broken down (to the subgroup corresponding to the third component of SU (2)) by the third term and the U (1) A part (which is usually called soft-Z 2 breaking term in the context of two-Higgs doublet models) is broken by the second c 1 term. The same chiral-two Higgs sector structure (without the scale invariance) has been discussed in [41,42]. At this point, the dimensionless couplings c 0,1,2 are simply assumed to be real and positive to have a conformal/flat direction.…”