Minimal Higgs Boson Research Articles

Distinguishing the Higgs Boson from the Dilaton at the Large Hadron Collider

It is likely that the LHC will observe a color- and charge-neutral scalar whose decays are consistent with those of the standard model (SM) Higgs boson. The Higgs interpretation of such a discovery is not the only possibility. For example, electroweak symmetry breaking could be triggered by a spontaneously broken, nearly conformal sector. The spectrum of states at the electroweak scale would then contain a narrow scalar resonance, the pseudo-Goldstone boson of conformal symmetry breaking, with Higgs-boson-like properties. If the conformal sector is strongly coupled, this pseudodilaton may be the only new state accessible at high energy colliders. We discuss the prospects for distinguishing this mode from a minimal Higgs boson at the LHC and ILC. The main discriminants between the two scenarios are (i) cubic self-interactions and (ii) a potential enhancement of couplings to massless SM gauge bosons.

Minimal supersymmetric SO(10) model and predictions for neutrino mixings and leptonicCPviolation

We discuss a minimal supersymmetric SO(10) model where $B\ensuremath{-}L$ symmetry is broken by a 126 dimensional Higgs boson multiplet which also contributes to fermion masses in conjunction with a 10 dimensional superfield. This minimal Higgs boson choice provides a partial unification of neutrino flavor structure with that of quarks and has been shown to predict all three neutrino mixing angles and the solar mass splitting in agreement with observations, provided one uses the type II seesaw formula for neutrino masses. In this paper we generalize this analysis to include arbitrary CP phases in couplings and vacuum expectation values. We find that (i) the predictions for neutrino mixings are similar with ${U}_{e3}\ensuremath{\simeq}0.18$ as before and other parameters in a somewhat bigger range and (ii) that to first order in the quark mixing parameter $\ensuremath{\lambda}$ (the Cabibbo angle), the leptonic mixing matrix is CP conserving. We also find that in the absence of any higher dimensional contributions to fermion masses, the CKM phase is different from that of the standard model implying that there must be new contributions to quark CP violation from the supersymmetry breaking sector. Inclusion of higher dimensional terms however allows the standard model CKM phase to be maintained.

Next to minimal Higgs boson: Mass bounds and search prospects at the CERN LHC

The Standard Model of electroweak interactions has one scalar doublet. The minimal extension of this sector is effected by adding a neutral, singlet scalar field. Depending on whether the singlet field has a non-zero vacuum expectation value, x, or not, the scenario has quite distinctive predictions. In particular, x unequal to 0 produces a mixing between the usual SU(2) doublet and the singlet, giving rise to two physical states and a goldstone boson with non-vanishing coupling to these. Presence of this coupling modifies the 2 jets + missing energy signal of the Bjorken process at LEP. We update the bounds on the Higgs mass using the LEP-1 data. We then explore, using parton-level Monte Carlo event generators, the production of these scalars at the LHC via gluon-gluon fusion and subsequent detection. We compare the signals with the expected backgrounds.

On the status of the production of the minimal Higgs boson (H0) via the radiative decay Z0→H0 γ

It is highlighted that the production of the Higgs boson H0 of the minimalSU(2)L×U(1) Y model of electroweak interactions in the radiative decay Z0→H0 γ must fall far short of the level predicted by the model concerned.

Are W pairs a detectable signature for heavy Higgs bosons at the Superconducting Super Collider?

Events with high-mass $W$ pairs and corresponding backgrounds have been generated, realistically simulated, and analyzed to isolate the Higgs boson. The signature considered is one produced when one $W$ decays leptonically while the other decays hadronically. Detection efficiencies are calculated for the case of an 800-GeV minimal Higgs boson. For the case of a top quark lighter than the $W$, the signal is observed with a statistical significance of two standard deviations after one year of simulated Superconducting Super Collider running with a luminosity of ${10}^{33}$ ${\mathrm{cm}}^{\ensuremath{-}2}$ ${\mathrm{s}}^{\ensuremath{-}1}$.