Left-right symmetry and heavy particle quantum effects

Details Left-right symmetry and heavy particle quantum effects Left-right symmetry and heavy particle quantum effects

1999-06-14

arxiv.org/abs/hep-ph/9906356v1

Nucl.Phys.B573:57-74,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 3 figures

Scientific paper

10.1016/S0550-3213(99)00717-8

We have renormalized a classical left-right model with a bidoublet, and left and right triplets in the Higgs sector. We focus on oblique corrections and show the interplay between the top quark, heavy neutrinos and Higgses contribution to the muon $\Delta r$ parameter. In the SM, custodial symmetry prevents large oblique corrections to appear. Although in LR models there is no such symmetry to make vanish the quadratically diverging terms, we have shown, that heavy Higgses contributions to $\Delta r$ are under control. Also the top contribution to $\Delta r$, quite different from that in the SM, is discussed. However, heavy neutrinos seem to give the most important contributions. From oblique corrections, they can be as large as the SM top one. Moreover, vertex and box diagrams give additional non-decoupling effects and only concrete numerical estimates are able to answer whether the model is still self-consistent.

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