Abstract

Recent analyses have shown that a sequential fourth generation can be consistent with precision electroweak data. We consider the possibility that the new generation could be a mirror generation with V+A rather than V-A interactions. Specifically we consider an extension of the minimal supersymmetric standard model with a light mirror generation. Implications of this extension are explored. One consequence is an enhancement of the τ neutrino magnetic moment by several orders of magnitude consistent with the current limits on the magnetic moment of the τ. The masses of the mirror generation arise due to electroweak symmetry breaking, and if a mirror generation exists its mass spectrum must lie below a TeV, and thus should be discovered at the LHC. Mirror particles and mirror sparticles produce many characteristic signatures which should be detectable at the LHC. Heavy Higgs boson decays into mirror particles and an analysis of the forward-backward asymmetries can distinguish a mirror generation from a sequential fourth generation. The validity of the model can thus be tested at the LHC. A model of the type discussed here could arise from a more unified structure such as grand unification or strings where a mirror generation escapes the survival hypothesis, i.e., a generation and a mirror generation do not tie up to acquire a mass of size MGUT or Mstring due to a symmetry, and thus remain massless down to the electroweak scale.

Notes

Originally published in Physical Review D v.78 (2008): 075013. DOI: 10.1103/PhysRevD.75.075013

Keywords

MSSM extension, Higgs boson decays, mirror particles, neutrinos, CERN LHC

Subject Categories

Symmetry (Physics), Higgs bosons

Disciplines

Physics

Publisher

American Physical Society

Publication Date

10-16-2008

Rights Information

Copyright (2008) American Physical Society

Rights Holder

American Physical Society


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