Need for Two Vectorlike Families in SUSY Composite Models

Details Need for Two Vectorlike Families in SUSY Composite Models Need for Two Vectorlike Families in SUSY Composite Models

1996-03-29

arxiv.org/abs/hep-ph/9603437v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, LaTeX, no macros needed

Scientific paper

Within the context of a viable and economical SUSY preon model, two vector--like families $Q_{L,R} = (U,D,N,E)_{L,R}$ and $Q^\prime_{L,R} = (U^\prime,D^\prime,N^\prime,E^\prime)_{L,R}$ with masses of order 1 TeV, one of which is a doublet of $SU(2)_L$ and the other a doublet of $SU(2)_R$, have been predicted to exist together with the three observed chiral families. The existence of these two vector--like families turns out to be crucial especially for an explanation of the inter--family mass--hierarchy and therefore for the SUSY preon model itself. This paper is devoted to a detailed study of the expected masses, mixings and decay modes of the vector--like fermions. Including QCD renormalization--effects, the masses of the vector--like quarks are expected to lie in the range of 500 GeV to about 2.5 TeV, while those of the vector--like leptons are expected to be in the range of 200 GeV to 1 TeV.

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