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SUSY Seesaw and FCNC

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arxiv hep-ph/0405017 v1 pith:T44Y7D2C submitted 2004-05-03 hep-ph

SUSY Seesaw and FCNC

classification hep-ph
keywords seesawsusyevenflavourideaseffectsleptonphysics
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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After a quarter of century of intense search for new physics beyond the Standard Model (SM), two ideas stand out to naturally cope with (i) small neutrino masses and (ii) a light higgs boson : Seesaw and SUSY. The combination of these two ideas, i.e. SUSY seesaw exhibits a potentially striking signature: a strong (or even very strong) enhancement of lepton flavour violation (LFV), which on the contrary remains unobservable in the SM seesaw. Indeed, even when supersymmetry breaking is completely flavour blind, Renormalisation Group running effects are expected to generate large lepton flavour violating entries at the weak scale. In Grand Unified theories, these effects can be felt even in hadronic physics. We explicitly show that in a class of SUSY SO(10) GUTs there exist cases where LFV and CP violation in B-physics can constitute a major road in simultaneously confirming the ideas of Seesaw and low-energy SUSY.

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