We propose that the diphoton excess at 750 GeV reported by ATLAS and CMS is due to the decay of an exo-Higgs scalar η 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 η and generate its couplings to gluons and photons at one 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 nontrivial 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.
Davoudiasl, H., Giardino, P.P., Zhang, C. (2016). Higgs-like boson at 750 GeV and genesis of baryons HIGGS-LIKE BOSON at 750 GeV and GENESIS of ... HOOMAN DAVOUDIASL, PIER PAOLO GIARDINO, and CEN ZHANG. PHYSICAL REVIEW D, 94(1) [10.1103/PhysRevD.94.015006].
Higgs-like boson at 750 GeV and genesis of baryons HIGGS-LIKE BOSON at 750 GeV and GENESIS of ... HOOMAN DAVOUDIASL, PIER PAOLO GIARDINO, and CEN ZHANG
Giardino P. P.;
2016-01-01
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 η 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 η and generate its couplings to gluons and photons at one 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 nontrivial 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
