Constraints on vector resonances from a strong Higgs sector

Abstract

We consider a scenario of a composite Higgs arising from a strong sector. We assume that the lowest lying composite states are the Higgs scalar doublet and a massive vector triplet, whose dynamics below the compositeness scale are described in terms of an effective Lagrangian. Electroweak symmetry breaking takes place through a vacuum expectation value just as in the Standard Model, but with the vector resonances strongly coupled to the Higgs field. We determine the constraints on this scenario imposed by (i) the Higgs diphoton decay rate, (ii) the electroweak precision tests and (iii) searches of heavy resonances at the LHC in the final states $l^+l^-$ and $l\nu_l$ ($l=e,\mu$), $\tau^+\tau^-$, $jj$, $t\bar{t}$, $WZ$, $WW$, $WH$ and $ZH$. We find that the heavy vector resonances should have masses that are constrained to be in the range $2.1$ - $3$ TeV. On the other hand, the mixing of the heavy vectors with the Standard Model gauge bosons is constrained to be in the range $\tan\vartheta\sim 0.1 - 0.3$, which is consistent with the assumption that the Higgs couples weakly to the Standard sector, even though it couples strongly to the heavy vector resonances.Comment: 14 pages, 18 figures. arXiv admin note: text overlap with arXiv:1506.0363

The Linear BESS model at the LHC

“…Notice that in the quasi-degenerate case, resonances with masses as light as 2000 or 2500 GeV are allowed. This is in agreement with previous studies on vector resonances [6,7,13].…”

“…This is a 1-loop process which includes the contribution of the new charged states: in our case, the new charged vector bosons V ± L and V ± R . For heavy vector bosons with moderate coupling to the Higgs boson, it is expected that this process does not deviate significantly from the SM [6,7]. This is exactly our case: the new vector bosons, as described above, are considered in the 2-4 TeV mass range .…”

Fermion masses and mixings and some phenomenological aspects of a 3-3-1 model with linear seesaw mechanism

“…The normalization given by (5.11) for h → γγ was also used in [76,120,[123][124][125][126][127][128]. The ratio R γγ has been measured by CMS and ATLAS collaborations with the best fit signals [129,130]: Correlations plots have been obtained to observe the behavior of the R γγ parameter as function of scalar masses and W gauge boson mass.…”

“…The normalization given by (5.11) for h → γγ was also used in [76,120,[123][124][125][126][127][128].…”

Generating lepton masses and mixings with a heavy vector doublet

“…[188]. In our analysis we have set Λ = 3 TeV, which is a typical value for the cutoff scale in this kind of models with heavy resonances [189][190][191][192][193][194][195][196]. A detailed study of the implications of our model at colliders and dark matter goes beyond the scope of this paper and is deferred for a future work.…”