LHC constraints on a Higgs boson partner from an extended color sector

Abstract

We discuss the properties and LHC phenomenology of a potentially discoverable heavy scalar boson (s) that arises in the context of the renormalizable coloron model; the model also contains a light scalar, h, identifiable with the 125 GeV state discovered by the LHC. These two scalar mass eigenstates are admixtures of a weak doublet gauge eigenstate and a weak singlet gauge eigenstate. A previous study set exclusion limits on the heavy s scalar, using the stability of the scalar potential, unitarity, electroweak precision tests, LHC searches for the 125 GeV Higgs; it also briefly discussed the √ s = 7, 8 TeV LHC searches for a heavy Higgs. In this work, we show how the projected LHC sensitivity at √ s = 14 TeV to the presence of a heavy Higgs and to the detailed properties of the 125 GeV Higgs will further constrain the properties of the new heavy s scalar.Since the renormalizable coloron model may contain spectator fermions to remove anomalies, we examine several representative scenarios with different numbers of spectator fermions. Our results are summarized in plots that overlay the current exclusion limits on the s boson with the projected sensitivity of the √ s = 14 TeV LHC to the new state. We find that the upcoming LHC searches should be sensitive to an s scalar of mass less than 1 TeV for essentially all of the model parameter space in which the h state differs from the Higgs boson of the SM. More precisely, unless the mixing between the weak doublet and weak singlet gauge-eigenstate scalars is zero, the 14 TeV LHC will be sensitive to the presence of the non-standard heavy s state that is characteristic of the renormalizable coloron model.

Coloron-assisted leptoquarks at the LHC

“…In this paper, we will ignore other potential coloroctet scalars in the renormalizable coloron model (see Ref. [17][18][19] for recent studies). All the SM quarks couple to site number one, so one has the coupling of G to quarks g s tan θq γ μ T a G a μ q .…”

Phenomenology of the Renormalizable Coloron Model

“…These considerations have been analyzed in [2], and the results are summarized within the exclusion plots depicted in Fig. 2 for various benchmark values of the free parameters, also incorporating some of the previously mentioned constraints for comparison.…”

“…(2.10) 2 The quark couplings to gluons remain vector-like, regardless of the chiral charge assignment.…”

“…Assuming the aforementioned spectator fermion properties, the described minimal framework contains additionally eight free parameters, which may be taken as the following set of the physically relevant quantities [1,2]:…”

Minimal SU(3)×SU(3) symmetry breaking patterns

“…This requires the spontaneous breaking of the product group into its diagonal subgroup. A simple structure that achieves that breaking consists of a single scalar field that transforms in the bifundamental representation, with a potential that includes a trilinear interaction, as discussed in the renormalizable coloron model (ReCoM) [8][9][10]. A model of this type has been recently proposed as a solution to the strong CP problem [11].…”