TY  - JOUR
AU  - Anamiati, G.
AU  - Hirsch, M.
AU  - Nardi, E.
PY  - 2016
DA  - 2016//
TI  - Quasi-Dirac neutrinos at the LHC
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 010
EP  - 19pp
VL  - 10
IS  - 10
PB  - Springer
KW  - Beyond Standard Model
KW  - Neutrino Physics
AB  - Lepton number violation is searched for at the LHC using same-sign leptons plus jets. The standard lore is that the ratio of same-sign lepton to opposite-sign lepton events, R-ll, is equal to R-ll = 1 (R-ll = 0) for Majorana (Dirac) neutrinos. We clarify under which conditions the ratio Rll can assume values different from 0 and 1, and we argue that the precise value 0 < R-ll < 1 is controlled by the mass splitting versus the width of the quasi-Dirac resonances. A measurement of R-ll not equal 0, 1 would then contain valuable information about the origin of neutrino masses. We consider as an example the inverse seesaw mechanism in a left-right symmetric scenario, which is phenomenologically particularly interesting since all the heavy states in the high energy completion of the model could be within experimental reach. A prediction of this scenario is a correlation between the values of R-ll and the ratio between the rates for heavy neutrino decays into standard model gauge bosons, and into three body final states ljj mediated by off-shell W-R exchange.
SN  - 1029-8479
UR  - http://arxiv.org/abs/1607.05641
UR  - https://doi.org/10.1007/JHEP10(2016)010
DO  - 10.1007/JHEP10(2016)010
LA  - English
N1  - WOS:000385397800001
ID  - Anamiati_etal2016
ER  -