New Low-energy Leptoquark Interactions

Details New Low-energy Leptoquark Interactions New Low-energy Leptoquark Interactions

1996-02-14

arxiv.org/abs/hep-ph/9602305v1

Phys.Lett. B378 (1996) 17-22

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 9 pages, no figures

Scientific paper

10.1016/0370-2693(96)00419-4

We discuss an extension of the standard model (SM) with vector and scalar leptoquarks. The renormalizable leptoquark Lagrangian consistent with the SM gauge symmetry is presented including the leptoquark-Higgs interactions previously not considered in the literature. We discuss the importance of these new interactions for leptoquark phenomenology. After the electro-weak symmetry breaking they generate non-trivial leptoquark mass matrices. These lead to mixing between different $SU(2)_L$-multiplets of the leptoquarks and induce at low energies new effective 4-fermion lepton-quark vertices. The latter affect the standard leptoquark phenomenology. We discuss constraints on these interactions from the helicity-suppressed $\pi\rightarrow \nu + e$ decay.

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