New issues in quark-lepton symmetry

Details New issues in quark-lepton symmetry New issues in quark-lepton symmetry

1995-07-18

arxiv.org/abs/hep-ph/9507324v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, LaTeX, invited talk at Valencia 95 (to appear in the Proceedings)

Scientific paper

Two models incorporating different forms of spontaneously broken quark-lepton symmetry are discussed. Both models are constructed so that quark-lepton symmetry can be broken at as low an energy scale as phenomenology allows, thus maximising their testability. The first model uses the Pati-Salam gauge group SU(4)$\otimes$SU(2)$_L\otimes$SU(2)$_R$. The main analysis presented here concerns large threshold corrections to the $m_b = m_{\tau}$ tree-level mass relation. The second model is a new and simplified theory using discrete quark-lepton symmetry which has a very economical Higgs sector and elegantly avoids a potential quark-lepton mass relation problem.

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