The light composite Higgs boson in strong extended technicolor

Abstract

This paper extends an earlier one describing the Higgs boson H as a light composite scalar in a strong extended technicolor model of electroweak symmetry breaking. The Higgs mass M H is made much smaller than Λ ETC by tuning the ETC coupling very close to the critical value for electroweak symmetry breaking. The technicolor interaction, neglected in the earlier paper, is considered here. Its weakness relative to extended technicolor is essential to understanding the lightness of H compared to the low-lying spin-one technihadrons. Technicolor cannot be completely ignored, but implementing technigluon exchange together with strong extended technicolor appears difficult. We propose a solution that turns out to leave the results of the earlier paper essentially unchanged. An argument is then presented that masses of the spin-one technifermion bound states, ρ H and a H , are much larger than M H and, plausibly, controlled by technicolor. Assuming M ρ H and M a H are in the TeV-energy region, we identify ρ H and a H with the diboson excesses observed near 2 TeV by ATLAS and CMS in LHC Run 1 data, and we discuss their phenomenology for Runs 2 and 3.

Search for massive resonances decaying into WW , WZ , ZZ , qSirunyan1, Tumasyan2, Adam3 et al. 2018Phys. Rev. D472480View full textAdd to dashboardCite

“…The heavy vector triplet (HVT) model generically subsumes a large number of models predicting additional gauge bosons, such as composite Higgs [45][46][47][48][49] and little Higgs [50,51] models. The specific models that predict W [52], Z [53], or W and Z [43] resonances are expressed in terms of a few parameters: the strength of the couplings to fermions, c F , couplings to the Higgs and longitudinally polarized SM vector bosons, c H , and the interaction strength g V of the new vector boson.…”

Search for dijet resonances in events with an isolated charged lepton using $$ \sqrt{s} $$ = 13 TeV proton-proton collision data collected by the ATLAS detector

“…The second model considered is a generic technicolor model [53] that assumes the production of a technirho, ρ T , that decays into a leptonically decaying W boson and a technipion π T , decaying into two jets. The mass of the ρ T is chosen to be a factor of two larger than the mass of the π T , which maximises the cross-section for the lνqq final state.…”

A multi-dimensional search for new heavy resonances decaying to boosted $$\text{ W }{}{}$$ $$\text{ W }{}{}$$ , $$\text{ W }{}{}$$ $$\text{ Z }{}{}$$ , or $$\text{ Z }{}{}$$ $$\text{ Z }{}{}$$ boson pairs in the dijet final state at 13 $$\text {Te}\text {V}$$

“…The HVT framework generically represents a large number of models predicting additional gauge bosons, such as the composite Higgs [35][36][37][38][39] and little Higgs [40,41] models. The benchmark points are formulated in terms of a few parameters: two coefficients c F and c H , that scale the couplings of the additional gauge bosons to fermions; to the Higgs boson and longitudinally polarized SM vector bosons, respectively, and g V , representing the typical strength of the new vector boson interaction.…”