Implications of the CMS search for W_R on Grand Unification

Abstract

The CMS experiment at the Large Hadron Collider has reported a 2.8$\sigma$ excess in the $(2e)(2jets)$ channel around 2.1 TeV. Interpretation of this data is reconsidered in terms of the production of a right-handed weak gauge boson, $W_R$, of the left-right symmetric model and in an $SO(10)$ grand unified theory abiding by the Extended Survival Hypothesis. The left-right symmetric model can be consistent with this excess if (a) the heavy right-handed neutrino has a mass near $W_R$, or (b) if $g_L\ne g_R$, or (c) the right-handed CKM matrix is nontrivial. Combinations of the above possibilities are also viable. A $W_R$ with a mass in the TeV region if embedded in $SO(10)$ is not compatible with $g_L=g_R$. Rather, it implies $0.64\le g_R/g_L\le 0.78$. Further, a unique symmetry-breaking route -- the order being left-right discrete symmetry breaking first, followed by $SU(4{)}_C$ and finally $SU(2{)}_R$ -- to the standard model is picked out. The $L\leftrightarrow R$ discrete symmetry has to be broken at around $10^{16}$ GeV. The grand unification scale is pushed to $10^{18}$ GeV making the detection of proton decay in ongoing searches rather unlikely. The $SU(4{)}_C$ breaking scale can be at its allowed lower limit of $10^6$ GeV so that $n-\bar{n}$ oscillation or flavour changing processes such as $K_L\to \mu e$ and $B_{d,s}\to \mu e$ may be detectable. The Higgs scalar multiplets responsible for $SO(10)$ symmetry breaking at various stages are uniquely identified so long as one adheres to a minimalist principle. We also remark, {\em en passant}, about a partially unified Pati-Salam model.

21 pages, v2: Published version. Clarifications and references added

References in corpus (8)

• Search for heavy neutrinos and W bosons with right-handed couplings in proton-proton collisions at sqrt(s) = 8 TeV
• Unified explanation of the $eejj$, diboson and dijet resonances at the LHC
• Search for heavy neutrinos and right-handed W bosons in events with two leptons and jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Heavy neutrinos and the $pp\to lljj$ CMS data
• A W' boson near 2 TeV: predictions for Run 2 of the LHC
• Interpretations of the ATLAS Diboson Anomaly
• Search for heavy neutrinos and W[R] bosons with right-handed couplings in a left-right symmetric model in pp collisions at sqrt(s) = 7 TeV
• Search for tb resonances in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector

Cited by in corpus (13)

• Unification, Proton Decay and Topological Defects in non-SUSY GUTs with Thresholds
• Lepton Number Violation and `Diracness' of massive neutrinos composed of Majorana states
• Roadmap of left-right models based on GUTs
• Testing the 2-TeV Resonance with Trileptons
• Left-right model with TeV fermionic dark matter and unification
• Threshold effects in SO(10) models with one intermediate breaking scale
• The ATLAS Diboson Resonance in Non-Supersymmetric SO(10)
• Exceptional Unification of Families and Forces
• Alternative search strategies for a BSM resonance fitting ATLAS diboson excess
• LHC probes of TeV-scale scalars in $\mathrm{SO}(10)$ grand unification
• SO(10) unification with horizontal symmetry
• Indian Contributions to LHC Theory
• The E6 route to multicomponent dark matter