Bounds on R-parity violating couplings at the grand unification scale from neutrino masses

Journal Article · Wed Sep 01 04:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.055027· OSTI ID:21421078

Dreiner, H K; Hanussek, M; Grab, S ^[1]

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1. Bethe Center for Theoretical Physics and Physikalisches Institut, Universitaet Bonn, Bonn, Germany, and SCIPP, University of California Santa Cruz, Santa Cruz, California 95064 (United States)

We consider the embedding of the supersymmetric standard model with broken R-parity in the minimal supergravity (mSUGRA) model. We restrict ourselves to the case of broken lepton number, the B{sub 3} mSUGRA model. We first study in detail how the tree-level neutrino mass depends on the mSUGRA parameters. 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{sup -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 one-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.

• OSTI ID: 21421078
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 82; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

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FIELD THEORIES
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LEPTON NUMBER
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MATHEMATICAL MODELS
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