Conveners
P1 - FLAVOUR SYMMETRIES
- Andrea Romanino
Claudia Hagedorn
(INFN, Section of Padua)
31/05/2011, 14:00
We construct a model in the framework of the MSSM in which the dihedral group D14 plays the role of the flavour symmetry. We show that in the quark sector the Cabibbo angle is predicted, |V_ud|=cos(pi/14), and at the same time mu-tau symmetric mixing in the neutrino sector. The solar mixing angle is expected to be large. Charged fermion mass hierarchies are explained. The spectrum of light...
Ivo de Medeiros Varzielas
(TU Dortmund)
31/05/2011, 14:15
Tribimaximal leptonic mixing is a mass-independent mixing scheme. By decomposing the associated effective neutrino mass matrix, we derive generic predictions in terms of the parameters governing the neutrino masses. We extend this phenomenological analysis to other mass-independent mixing schemes. We classify models that produce tribimaximal leptonic mixing through the group structure of their...
Dr
Luca Merlo
(Technische Universitat Munchen)
31/05/2011, 14:30
Flavour symmetries have been widely studied to account for the Flavour Problem. Successful flavour models provide an explanation for the observed pattern of fermion masses and mixings, independently on the type of the implemented symmetry (either local or global, either discrete or continuous, either Abelian or non-Abelian). In order to distinguish among different constructions and to confirm...
Catarina Simões
(CFTP - IST)
31/05/2011, 14:45
A flavour symmetry based on Z_4 is developed in the context of SU(5) Grand Unification with the standard fermionic content plus three right-handed neutrinos. It is demanded for Z_4 to forbid some Yukawa couplings of up- and down-quarks to Higgs scalars so that the quark mass matrices M_u, M_d have Nearest-Neighbour-Interaction (NNI) structure, once they are generated through the electroweak...
Christoph Luhn
(University of Southampton)
31/05/2011, 15:00
We propose new classes of models which predict both tri-bimaximal lepton mixing and a right-angled CKM unitarity triangle, alpha approximately 90 degrees. The ingredients of the models include a supersymmetric unified gauge group such as SU(5), a discrete family symmetry such as A4 or S4, a shaping symmetry including products of Z2 and Z4 groups as well as spontaneous CP violation. We show how...
Dr
Enrico Nardi
(INFN-LNF)
31/05/2011, 15:15
The spontaneous breaking of the $SU(3)^5$ quark/lepton flavor symmetry by means of three multiplets of `Yukawa scalar fields' admits vacua with one $O(1)$ and two vanishing vevs for each multiplet. With three generations, and only in this case, the vanishing entries are lifted to exponentially suppressed values by the addition of symmetry invariant logarithmic terms. A strong hierarchy for...
