Exo-Higgs at 750 GeV and Genesis of Baryons
Hooman Davoudiasl, Pier Paolo Giardino, Cen Zhang

TL;DR
This paper proposes a new model where an exo-Higgs scalar explains the 750 GeV diphoton excess and links to baryogenesis via a first order phase transition in a new $SU(2)_e$ symmetry, predicting TeV-scale exo-vector bosons.
Contribution
It introduces a novel exo-Higgs and exo-fermion framework that connects the diphoton excess with baryogenesis and predicts new TeV-scale exo-vector bosons for experimental tests.
Findings
Explains the 750 GeV diphoton excess with an exo-Higgs scalar.
Links $SU(2)_e$ symmetry breaking to baryogenesis via a first order phase transition.
Predicts TeV-scale exo-vector bosons detectable at the LHC.
Abstract
We propose that the diphoton excess at 750 GeV reported by ATLAS and CMS is due to the decay of an scalar associated with the breaking of a new symmetry, dubbed . New fermions, and , get TeV-scale masses through Yukawa couplings with and generate its couplings to gluons and photons at 1-loop. The matter content of our model yields a anomaly under , whose breaking we assume entails a first order phase transition. A non-trivial 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 can in principle directly lead to electroweak symmetry breaking, thereby accounting for the proximity of the mass scales of the SM Higgs and the…
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