Symmetries, moduli and fermion mass structure
The hierarchical structure of fermion masses suggests an underlying family symmetry, spontaneously broken by the vacuum expectation value of moduli (familon) field, triggered by supersymmetry breaking. The familons also acquire non vanishing F-terms, typically of order (theta)m(3/2). These F-terms c...
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| Format: | Conference item |
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2003
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| Summary: | The hierarchical structure of fermion masses suggests an underlying family symmetry, spontaneously broken by the vacuum expectation value of moduli (familon) field, triggered by supersymmetry breaking. The familons also acquire non vanishing F-terms, typically of order (theta)m(3/2). These F-terms contribute to the soft trilinear couplings and lead to flavour changing and CP violating processes. Current experimental limits require the slepton mass be heavier then 300GeV and impose strong bounds on the right handed down quark quark mixing angles which are inconsistent with models relating them to neutrino mixing angles and favour a near symmetric form for the magnitude of the mass matrix elements. The decay mu -> e gamma should be very close to the present upper bound. |
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