Aug 23 – 28, 2010
Europe/Berlin timezone

Bounds on R-parity Violating Couplings at the Grand Unification Scale from Neutrino Masses

Aug 26, 2010, 5:20 PM
Wolfgang-Paul-HS (Bonn)



Nussallee 12


Ms Marja Hanussek (Uni Bonn)


We consider the embedding of the supersymmetric Standard Model with broken R-parity in the minimal supergravity model. We restrict ourselves to the case of broken lepton number, the B3 mSUGRA model. We find in particular a strong dependence on the trilinear supersymmetry breaking A-parameter, even in the vicinity of the mSUGRA SPS1a point. We then reinvestigate the bounds on the trilinear R-parity violating couplings at the unification scale from the low-energy neutrino masses including dominant one-loop contributions. These bounds were previously shown to be very strict, as low as O(10^{-6}) for SPS1a. We show that these bounds are significantly weakened when considering the full mSUGRA parameter space. In particular the ratio between the tree-level and 1-loop neutrino masses is reduced such that it may agree with the observed neutrino mass hierarchy. We discuss in detail how and in which parameter regions this effect arises.

Primary author

Ms Marja Hanussek (Uni Bonn)


Prof. Herbi Dreiner (Uni Bonn) Dr Sebastian Grab (UC Santa Cruz)

Presentation materials