Fitting Neutrino Physics with a U(1)_R Lepton Number

Abstract

We study neutrino physics in the context of a supersymmetric model where a continuous R-symmetry is identified with the total Lepton Number and one sneutrino can thus play the role of the down type Higgs. We show that R-breaking effects communicated to the visible sector by Anomaly Mediation can reproduce neutrino masses and mixing solely via radiative contributions, without requiring any additional degree of freedom. In particular, a relatively large reactor angle (as recently observed by the Daya Bay collaboration) can be accommodated in ample regions of the parameter space. On the contrary, if the R-breaking is communicated to the visible sector by gravitational effects at the Planck scale, additional particles are necessary to accommodate neutrino data.

19 pages, 3 figures; v2: references added, constraints updated, overall conclusions unchanged

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• Charting generalized supersoft supersymmetry
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• Constrained Dirac gluino mediation
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