| Article | |
| Report number | arXiv:0809.5211 ; CERN-PH-TH-2008-140 ; CERN-PH-TH-2008-140 |
| Title | Supersymmetric Grand Unification and Lepton Universality in $K \to l\nu$ Decays |
| Author(s) | Ellis, John (CERN) ; Lola, Smaragda (Patras U.) ; Raidal, Martti (NICPB, Tallinn) |
| Publication | 2009 |
| Imprint | 01 Oct 2008 |
| Number of pages | 19 |
| In: | Nucl. Phys. B 812 (2009) 128-143 |
| DOI | 10.1016/j.nuclphysb.2008.12.006 |
| Subject category | Particle Physics - Phenomenology |
| Abstract | in the near future, one may nevertheless obtain significant constraints on the model parameters and unknown aspects of right-handed fermion and sfermion mixing. Motivated by the prospects for an improved test of lepton universality in K -> l \nu decays by the NA62 experiment at CERN, we study predictions for the possible lepton non-universality in K -> l \nu decays in supersymmetric models. Violations of \mu-e universality in this process may originate from mixing effects in the right-handed slepton sector, providing a unique window into this aspect of supersymmetric flavour physics in the large-\tan\beta region. Minimal unification scenarios with universal soft supersymmetry-breaking terms at the GUT scale would predict negligible violation of lepton universality. However, lepton non-universality may be observable in non-minimal grand unified models with higher-dimensional terms contributing to fermion masses, in which case renormalization effects above the GUT scale may enhance the mixing among the right-handed sleptons. This could leads to observable lepton non-universality in K -> l \nu decays in specific regions of the parameter space with high \tan \beta, large A terms and small charged Higgs boson mass. Observable non-universality in K -> l \nu decays would be correlated with a large value of BR(\tau -> e \gamma). The experimental upper limit on the electric dipole moment of the electron could be reconciled with leptogenesis, if the latter occurs at a relatively low scale, which would also alleviate the cosmological gravitino problem. Even if lepton non-universality is not seen |
| Copyright/License | Elsevier B.V. |
Corresponding record in: Inspire
Record created 2008-10-01, last modified 2023-03-15
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