The production and decay of new possible heavy Majorana neutrinos are
analyzed in hadronic collisions. New bounds on the mixing of these particles
with standard neutrinos are estimated according to a fundamental representation
suggested by grand unified models.
A clear signature for these Majorana neutrinos is given by same-sign
dileptons plus a charged weak vector boson in the final state. We discuss the
experimental possibilities for the future Large Hadron Collider (LHC) at CERN.Comment: Latex2e(epsfig), 12 pages, 8 figures, to appear Physical Review
We discuss the possibility of same-sign dileptons as a signature for Majorana neutrinos. The production mechanism is given by a single heavy neutrino production and decay pp −→ l ± N X −→ l ± l ± X ′ . Cross section and distributions are presented for the LHC energies.
In this paper we discuss a left-right symmetric model for elementary
particles and their connection with the mass spectrum of elementary fermions.
The model is based on the group $SU(2)_L\otimes SU(2)_R\otimes U(1)$. New
mirror fermions and a minimal set of Higgs particles that breaks the symmetry
down to $U(1)_{em}$ are proposed. The model can accommodate a consistent
pattern for charged and neutral fermion masses as well as neutrino
oscillations. An important consequence of the model is that the connection
between the left and right sectors can be done by the neutral vector gauge
bosons Z and a new heavy Z'.Comment: 7 pages, 3 figures. Accepted in Eur. Phys. J.
We discuss the production and decay of possible new heavy leptons in some extensions of the standard model. We present a comparison between models and the recent results from the CERN e + e -collider LEP and analyze the most reliable signatures for heavy leptons in the reaction e + e P -I L . A clear separation among models and masses can be done using a Monte Carlo reconstruction of the events.
We discuss the possibility of detecting heavy spin-3/2 leptons at LEP2 and NLC energies. The angular distributions of primary ordinary leptons are shown to be a good measure to discriminate between a heavy spin-3/2 lepton and a similar nonstandard spin-1/2 signal.
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