Abstract
We investigate the possibility of TeV-scale scalars as low energy remnants arising in the nonsupersymmetric SO(10) grand unification framework where the field content is minimal. We consider a scenario where the SO(10) gauge symmetry is broken into the gauge symmetry of the Standard Model (SM) through multiple stages of symmetry breaking, and a colored and hypercharged scalar χ picks a TeV-scale mass in the process. The last stage of the symmetry breaking occurs at the TeV-scale where the left-right symmetry, that is, SU(2)L⊗SU(2)R⊗U(1)B-L⊗SU(3)C, is broken into that of the SM by a singlet scalar field S of mass MS~1 TeV, which is a component of an SU(2)R-triplet scalar field, acquiring a TeV-scale vacuum expectation value. For the LHC phenomenology, we consider a scenario where S is produced via gluon-gluon fusion through loop interactions with χ and also decays to a pair of SM gauge bosons through χ in the loop. We find that the parameter space is heavily constrained from the latest LHC data. We use a multivariate analysis to estimate the LHC discovery reach of S into the diphoton channel.
Highlights
After the discovery of the Higgs boson at the Large Hadron Collider (LHC) [1, 2], the last piece of the triumphant achievement of the high energy physics community, the Standard Model (SM), the great expectations for the observation of some sort of new physics at the LHC, emanated from the paradigms based on the familiar intuitions, some of which have so far lead the community to success, have turned out to be great disappointments as the LHC searches to date have returned empty-handed
In terms of the renormalization group (RG) evolution, which is our main focus here, this extra multiplet would not alter the results noticeably, because its effect in the RG equations would appear as a contribution in the term (−5aL + 3aR + 2a4) (see (14)), which would be very small compared to the rest of the term
We explore the phenomenology of TeV-scale scalars in the nonsupersymmetric SO(10) grand unification framework
Summary
After the discovery of the Higgs boson at the Large Hadron Collider (LHC) [1, 2], the last piece of the triumphant achievement of the high energy physics community, the Standard Model (SM), the great expectations for the observation of some sort of new physics at the LHC, emanated from the paradigms based on the familiar intuitions, some of which have so far lead the community to success, have turned out to be great disappointments as the LHC searches to date have returned empty-handed. By slightly relaxing the ESH conjecture by allowing one or more colored scalars to become light (at the TeV-scale), it is possible to have a TeVscale left-right model in the SO(10) framework [23]. The field Δ0R1 breaks the symmetry of the left-right model into that of the SM by acquiring a VEV presumably at the TeV-scale in our set-up. The advantage of having a TeV-scale colored scalar is twofold: it is responsible for the production and decay of S and it can successfully be embedded in the minimal nonsupersymmetric SO(10) GUT scheme while maintaining the field content minimal.
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