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arXiv · 2509.13245

Smallness of neutrino masses and leptogenesis in 331 composite Higgs model

Roman Nevzorov
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Abstract

We consider 331 composite Higgs model (CHM3) in which the Lagrangian of the strongly coupled sector is invariant with respect to global SU(3)_C \times SU(3)\times U(1)_6 symmetry that can originate from SU(6) subgroup of E_6 and contains the gauge group of the standard model (SM) as a subgroup. The breakdown of the approximate SU(3)\times U(1)_6 symmetry down to SU(2)_W\times U(1)_Y subgroup around the scale f\sim 10 TeV results in a set of pseudo--Nambu--Goldstone bosons (pNGBs) that, in particular, involves Higgs doublet. The generation of the masses of the SM fermions in the CHM3 is discussed. We argue that approximate U(1)_L and discrete Z_2 symmetries may give rise to tiny masses of the left--handed neutrinos and several composite fermions with masses 1-2 TeV. The lepton and baryon asymmetries can be generated within the CHM3 via the out--of equilibrium decays of extra Majorana particle into the Higgs doublet and these composite fermions.

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Roman Nevzorov. 2025-09-16. Smallness of neutrino masses and leptogenesis in 331 composite Higgs model. https://arxiv.org/abs/2509.13245

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