Exo-Higgs at 750 GeV and Genesis of Baryons

Abstract

We propose that the diphoton excess at 750 GeV reported by ATLAS and CMS is due to the decay of an $exo-Higgs$ scalar $\eta$ associated with the breaking of a new $SU(2{)}_e$ symmetry, dubbed $exo-spin$. New fermions, $exo-quarks$ and $exo-leptons$, get TeV-scale masses through Yukawa couplings with $\eta$ and generate its couplings to gluons and photons at 1-loop. The matter content of our model yields a $B-L$ anomaly under $SU(2{)}_e$, whose breaking we assume entails a first order phase transition. A non-trivial $B-L$ asymmetry may therefore be generated in the early universe, potentially providing a baryogenesis mechanism through the Standard Model (SM) sphaleron processes. The spontaneous breaking of $SU(2{)}_e$ can in principle directly lead to electroweak symmetry breaking, thereby accounting for the proximity of the mass scales of the SM Higgs and the exo-Higgs. Our model can be distinguished from those comprising a singlet scalar and vector fermions by the discovery of TeV scale exo-vector bosons, corresponding to the broken $SU(2{)}_e$ generators, at the LHC.

9 pages, 3 figures

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Cited by in corpus (9)

• Gravitational waves from the asymmetric-dark-matter generating phase transition
• Interpreting the 750 GeV digamma excess: a review
• Topological Structure of the Vacuum, Cosmological Constant and Dark Energy
• LHC signatures of neutral pseudo-Goldstone boson in the E6CHM
• Phenomenology of an $SU(2{)}_1\times SU(2{)}_2\times U(1{)}_Y$ model at the LHC
• Baryogenesis in a Parity Solution to the Strong CP Problem
• A spartan model for the LHC diphoton excess
• Electroweak-like Baryogenesis with New Chiral Matter
• Asymmetric Dark Matter in Extended Exo-Higgs Scenarios