LHC Probes of TeV-Scale Scalars in SO(10) Grand Unification

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 picks a TeV-scale mass in the process. The last stage of the symmetry breaking occurs at the TeV-scale where the leftright symmetry, that is, SU(2) ⊗ SU(2) ⊗ U(1) − ⊗ SU(3) , is broken into that of the SM by a singlet scalar field S of mass S ∼ 1 TeV, which is a component of an SU(2) -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 and also decays to a pair of SM gauge bosons through 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.

Addressing the RD(*) anomalies with an Aydemir1, Mandal2, Mitra3 2020Phys. Rev. DSelf Cite600270View full textAdd to dashboardCite

“…This is appealing because this leptoquark by itself can potentially explain the B-decay anomalies at the LHC [21,22,25,32]. The SO(10) grand unification framework is an appealing scenario, which has been heavily studied in the literature [62,[64][65][66][67][68][69][70][71][72][73][74][75]. It unifies the three forces in the SM, explains the quantization of electric charge, provides numerous dark matter candidates, accommodates seesaw mechanism for small neutrino masses, and justifies the remarkable cancellation of anomalies through the anomaly-free nature of the SO(10) gauge group.…”

B-decay anomalies and scalar leptoquarks in unified Pati-Salam models from noncommutative geometry

“…The SO (10) picture, on the other hand, can accommodate this in a reasonable scenario (as in Refs. [73,84]) by including intermediate symmetry breaking scales.…”

“…The last row lists for comparison the scalar content of the SO(10) based G 422 model discussed in Ref. [73], below its unification scale where the SO(10) symmetry is broken to G 422 . Note that in our notation throughout the paper the subscripts L and R of scalars indicate the chirality of fermions that the corresponding scalars couple to, which is shown explicitly in Section 4 through the decomposition of the interaction terms, such as Eqs.…”

“…For comparison, the last row of Table 1 lists the scalar content of an SO (10) based G 422 model studied in Ref. [73], after SO( 10) is broken to G 422 .…”

Clifford-based spectral action and renormalization group analysis of the gauge couplings

“…The general case of course covers this specific version but we display it here anyway in part because it is convenient to use this case to illustrate to which extent these scalars modify the RG running of the SM, in part because TeV-scale scalars are relevant in terms of the LHC searches (see for instance Ref. [24,46]); thus, it is useful to inspect whether there is an improvement towards unification in each special case (given in Table 1), even though unification is not achieved. Now, we will assume in each case that at least one of these five scalars,…”