TY - JOUR
T1 - Lepton number violation in TeV scale see-saw extensions of the standard model
AU - Ibarra, A.
AU - Molinaro, E.
AU - Petcov, S. T.
PY - 2011
Y1 - 2011
N2 - The low-energy neutrino physics constraints on the TeV scale type I see-saw scenarios of neutrino mass generation are revisited. It is shown that lepton charge (L) violation, associated to the production and decays of heavy Majorana neutrinos Nj having masses in the range of Mj ∼ (100 ÷ 1000) GeV and present in such scenarios, is hardly to be observed at ongoing and future particle accelerator experiments, LHC included, because of very strong constraints on the parameters and couplings responsible for the corresponding |ΔL| = 2 processes. If the heavy Majorana neutrinos N j are observed and they are associated only with the type I mechanism, they will behave effectively like pseudo-Dirac fermions. Conversely, the observation of effects proving the Majorana nature of Nj would imply that these heavy neutrinos have additional relatively strong couplings to the Standard Model particles or that light neutrino masses compatible with the observations are generated by a mechanism other than see-saw (e.g., radiatively at one or two loop level) in which the heavy Majorana neutrinos Nj are nevertheless involved.
AB - The low-energy neutrino physics constraints on the TeV scale type I see-saw scenarios of neutrino mass generation are revisited. It is shown that lepton charge (L) violation, associated to the production and decays of heavy Majorana neutrinos Nj having masses in the range of Mj ∼ (100 ÷ 1000) GeV and present in such scenarios, is hardly to be observed at ongoing and future particle accelerator experiments, LHC included, because of very strong constraints on the parameters and couplings responsible for the corresponding |ΔL| = 2 processes. If the heavy Majorana neutrinos N j are observed and they are associated only with the type I mechanism, they will behave effectively like pseudo-Dirac fermions. Conversely, the observation of effects proving the Majorana nature of Nj would imply that these heavy neutrinos have additional relatively strong couplings to the Standard Model particles or that light neutrino masses compatible with the observations are generated by a mechanism other than see-saw (e.g., radiatively at one or two loop level) in which the heavy Majorana neutrinos Nj are nevertheless involved.
UR - http://www.scopus.com/inward/record.url?scp=84856359415&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/335/1/012048
DO - 10.1088/1742-6596/335/1/012048
M3 - Conference article
AN - SCOPUS:84856359415
SN - 1742-6588
VL - 335
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012048
T2 - 2nd Symposium on Prospects in the Physics of Discrete Symmetries, DISCRETE 2010
Y2 - 6 December 2010 through 11 December 2010
ER -