Vector Leptoquarks Could Be Rather Light?

Details Vector Leptoquarks Could Be Rather Light? Vector Leptoquarks Could Be Rather Light?

1994-06-21

arxiv.org/abs/hep-ph/9406347v1

Phys.Lett.B329:295-299,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, LaTeX, Yaroslavl, Yaroslavl State University preprint YARU-HE-94/02

Scientific paper

10.1016/0370-2693(94)90775-7

Some low-energy manifestations of a minimal extension of the Standard Model based on the quark-lepton $SU(4)_V \otimes SU(2)_L \otimes G_R$ symmetry of the Pati-Salam type are analysed. Given this symmetry a new type of mixing in the quark-lepton interactions is shown to be required. An additional arbitrariness of the mixing parameters could allow to decrease noticeably the lower bound on the leptoquark mass $M_X$ originated from the $\pi$ and $K$ decays and the $\mu e$ conversion. The only mixing independent bound emerging from the cosmological limit on the $\pi^0 \rightarrow \nu \bar{\nu}$ decay width is $M_X > 18~TeV$.

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