arXiv subjects

M. Flanz

Publications and source records attributed to M. Flanz.

2 recordsLinked to original sources

arXiv2000

Trimuon production in νN-scattering as a probe of massive neutrinos

The lepton-number violating process ν_μN \to μ^- μ^+ μ^+ X is studied for the first time in connection with Majorana neutrino masses of the second generation. The sensitivity for light and heavy Majorana neutrinos is investigated. The ratio with respect to the standard model charged current process is improved by some orders of magnitude if compared to previously discussed Majorana induced ΔL_μ = 2 processes. Non-observation of this process in previous experiments allows to demand the effective mass to be < m_{μμ} > \ls 10^4 GeV, being more stringent than previously discussed direct bounds, however still unnaturally high. Therefore, in the forseeable future, indirect bounds on effective masses other than m_{ee} will be more stringent.

hep-ph↗

arXiv2000

Leptogenesis with "Fuzzy Mass Shell" for Majorana Neutrinos

We study the mixing of elementary and composite particles. In quantum field theory the mixing of composite particles originates in the couplings of the constituent quarks and for neutrinos in self-energy diagrams. In the event that the incoming and outgoing neutrinos have different masses, the self-energy diagrams vanish because energy is not conserved but the finite decaying widths make the mixing possible. We can consider the neutrinos to be "fuzzy" states on their mass shell and the mixing is understood as the overlap of two wavefunctions. These considerations restrict the mass difference to be approximately equal to or smaller than the largest of the two widths: abs(M_i - M_j) lessorequal max(Gamma_i, Gamma_j).

hep-ph↗