While gluinos and neutralinos are Majorana fermions in the MSSM, they can be Dirac fermion fields in extended supersymmetry models. The difference between the two cases manifests itself in production and decay processes at colliders. In this contribution, results are presented for how the Majorana or Dirac nature of gluinos and neutralinos can be extracted from di-lepton signals at the LHC. PAC...

Following the pioneering Okubo scrutiny of gauge simple groups for the quantum chromodynamics we show the constraints coming from the wondrous predictive leptoquark-bilepton flavordynamics connecting the number of color charges to solution of the flavor question and to an electric charge quantization unconstrained from the Dirac, Majorana or Dirac–Majorana character of massive neutrino. PACS nu...

By combining the inputs from the neutrinoless double beta decay and the fits of cosmological models of dark matter with solar and atmospheric neutrino data, we obtain constraints on two of the mixing angles of Majorana neutrinos, which become stronger when coupled with the reactor neutrino data. These constraints are strong enough to rule out Majorana neutrinos if the small angle solution of so...

The study of neutrinoless double beta decay (DBD) is the only presently known approach to the fundamental question if the neutrino is a Majorana particle, i.e. its own anti-particle. The observation of neutrinoless DBD would not only establish the Majorana nature of the neutrino but also allow to determine its effective mass if the nuclear matrix elements are given. The status of experiments un...

The Italian physicist Ettore Majorana, who disappeared in 1938, is now widely recognized for inventing the notion of a fermionic particle, the Majorana fermion, which has the strange property of being its own antiparticle [1]. What is perhaps less well known is that he also developed a natural and exact representation of a quantum spin [2], which inspired Julian Schwinger to create the bosonic ...

We analyze the dependence of the squared amplitudes on the rephasing-invariant CP violating parameters of the lepton sector, involving Majorana neutrinos, for various leptonconserving and lepton-violating processes. We analyze the conditions under which the CP violating effects in such processes vanish, in terms of the minimal set of rephasing invariants, giving special attention to the depende...

If the mixing angles in each of the seesaw sectors are all small, and the neutrino masses are hierarchical, we study the conditions for large neutrino mixing using triangular matrices. In particular, the implication of the neutrino oscillation data for the mass hierarchy in the heavy Majorana sector is examined, and the heavy Majorana scales are shown to depend sensitively on the solar mixing a...

A mechanism is presented, in which the mixing of right handed heavy Majorana neutrinos creates a CP−asymmetric universe. When these Majorana neutrinos subsequently decay more leptons than antileptons are produced. The lepton asymmetry created by this new mechanism can exceed by a few orders of magnitude any lepton asymmetry originating from direct decays. The asymmetry is finally converted into...

An anterior hypothalamic knife cut that leaves intact two central sites of action of angiotension II produces the same deficits in the pressor responses to angiotensin II that have been attributed to destruction of two circumventricular organs (the subfornical organ and the organum vasculosum of the lamina terminalis). The central pressor actions of angiotensin II are necessary for the full exp...