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arXiv · 2212.06163

Electroweak-flavour and quark-lepton unification: a family non-universal path

Joe Davighi·Gino Isidori·Marko Pesut
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Abstract

We present a family-non-universal extension of the Standard Model where the the first two families feature both quark-lepton and electroweak-flavour unification, via the $SU(4) \times Sp(4)_L \times Sp(4)_R$ gauge group, whereas quark-lepton unification for the third family is realised \`a la Pati-Salam. Via staggered symmetry breaking steps, this construction offers a natural explanation for the observed hierarchical pattern of fermion masses and mixings, while providing a natural suppression for flavour-changing processes involving the first two generations. The last-but-one step in the symmetry-breaking chain is a non-universal 4321 model, characterised by a vector leptoquark naturally coupled mainly to the third generation. The stability of the Higgs sector points to a 4321$\to$SM symmetry-breaking scale around the TeV, with interesting phenomenological consequences in $B$ physics and collider processes that differ from those of other known 4321 completions.

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Joe Davighi, Gino Isidori, Marko Pesut. 2022-12-12. Electroweak-flavour and quark-lepton unification: a family non-universal path. https://doi.org/10.1007/jhep04(2023)030

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