Third-family quark-lepton unification with a fundamental composite Higgs

Abstract We present a model for third-family quark-lepton unification at the TeV scale featuring a composite Higgs sector. The model is based on a variant of the Pati-Salam model, the so-called 4321 model, consisting of the gauge group S U ( 4 ) × S U ( 3 ) ′ × S U ( 2 ) L × U ( 1 ) X . The spontaneous symmetry breaking to the SM gauge group is triggered dynamically by a QCD-like confining sector. The same strong dynamics also produces the Higgs as a pseudo Nambu-Goldstone boson, connecting the energy scales of both sectors. The model predicts a massive U 1 vector leptoquark coupled dominantly to the third generation, recently put forward as a possible solution to the B-meson anomalies.