Experimental and theoretical implications of new sequential leptons
Journal
Physical Review D
Journal Volume
292
Journal Issue
3-4
Pages
3643-3649
Date Issued
1992
Author(s)
Gwo Guang Wong
Abstract
If new sequential leptons E± and N0 exist, the CERN LEP bound implies mE, mN>MZ2. The heaviness of the neutral lepton breaks away from the pattern of the first three generations. The minimal model is to have 4 left-handed lepton doublets and 4 right-handed charged lepton singlets, but only one right-handed neutral lepton singlet. Since in general the third and fourth generations should mix, and since |mN-mE| should not be too large, neither E nor N would be stable, and both tend to decay via the Cabibbo suppressed E→ντ or N→τ charged currents. This leads to the interesting signature of like-sign W pair production via E+N→ν̄ττ-W+W- at the SSC and CERN LHC. The popular seesaw mechanism cannot plausibly accommodate the near masslessness of the light neutrinos and the heaviness of N0 simultaneously. The representation structure poses a difficulty to the traditional approach of SO(10)-based grand unified theories. The discovery of such new heavy leptons would thus have interesting implications. © 1994 The American Physical Society.
Type
journal article