Split-Family SUSY, U(2)^5 Flavour Symmetry and Neutrino Physics

Abstract

In split-family SUSY, one can use a U(2)^3 symmetry to protect flavour observables in the quark sector from SUSY contributions. However, attempts to extend this procedure to the lepton sector by using an analogous U(2)^5 symmetry fail to reproduce the neutrino data without introducing some form of fine-tuning. In this work, we solve this problem by shifting the U(2)^2 symmetry acting on leptons towards the second and third generations. This allows neutrino data to be reproduced without much difficulties, as well as protecting the leptonic flavour observables from SUSY. Key signatures are a $\mu \to e\gamma$ branching ratio possibly observable in the near future, as well as having selectrons as the lightest sleptons.

9 pages, 3 figures; v2: improved discussion of LFV processes, results unchanged; v3: Minor changes, version accepted for publication in EPJ C

References in corpus (6)

• Hierarchical Soft Terms and Flavor Physics
• A Non Standard Supersymmetric Spectrum
• Particle-Antiparticle Mixing, CP Violation and Rare K and B Decays in a Minimal Theory of Fermion Masses
• Inverted sfermion mass hierarchy and the Higgs boson mass in the MSSM
• New Constraints on General Slepton Flavor Mixing
• Interplay of LFV and slepton mass splittings at the LHC as a probe of the SUSY seesaw

Cited by in corpus (1)

• Resolving a challenging supersymmetric low-scale seesaw scenario at the ILC