منابع مشابه
The See - Saw Mechanism , Neutrino Yukawa Couplings ,
The LFV charged lepton decays µ → e+γ, τ → e+γ and τ → µ+γ and thermal leptogenesis are analysed in the MSSM with seesaw mechanism of neutrino mass generation and soft SUSY breaking with universal boundary conditions. The case of hierarchical heavy Majorana neutrino mass spectrum, M 1 ≪ M 2 ≪ M 3 , is investigated. Leptogenesis requires M 1 > ∼ 10 9 GeV. Considering the natural range of values ...
متن کاملSee-saw Mechanisms for Dirac and Majorana Neutrino Masses
(Dated: April 9, 2008) We investigate the see-saw mechanism for generally non-fine-tuned n × n mass matrices involving both Dirac and Majorana neutrinos. We specifically show that the number of naturally light neutrinos cannot exceed half of the dimension of the considered mass matrix. Furthermore, we determine a criterion for mass matrix textures leading to light Dirac neutrinos with the see-s...
متن کاملSee-saw Mechanism and Four Light Neutrino States
A formal proof is given that in a seesaw type neutrino mass matrix with only two neutrino mass scales (m D ≪ m R) and the maximal rank of m R(D) we can not get a fourth light sterile neutrino.
متن کاملSee-Sawless Neutrino Masses
An alternative to the famous see-saw mechanism is proposed to explain the smallness of the neutrino masses (if present). This model involves a fourth family which mixes very little with the other three. It contains one heavy neutrino (mN > mZ/2) and three very light neutrinos whose masses are radiatively induced. In contrast with the see-saw mechanism, all neutrino masses are Dirac masses. In o...
متن کاملNeutrino masses , muon g − 2 , and lepton - flavour violation in the supersymmetric see - saw model
In the light of the recent muon (gμ − 2) result by the E821 experiment at the Brookhaven National Laboratory, we study the event rates of the charged leptonflavour-violating (LFV) processes in the supersymmetric standard model (SUSY SM) with the heavy right-handed neutrinos (SUSY see-saw model). Since the left-handed sleptons get the LFV masses via the neutrino Yukawa interaction in this model,...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of High Energy Physics, Gravitation and Cosmology
سال: 2020
ISSN: 2380-4327,2380-4335
DOI: 10.4236/jhepgc.2020.62021