Neutrinos and Flavour. G.G.Ross, Coseners House, May 03. What is the origin of the Quark and lepton masses, mixing angles and CP violating phases?. Family?. Family?. Masses. 1. GeV. THEORY :. DATA :. ?. Mixing. Data. Theory ?. Hierarchy. Democracy.
G.G.Ross, Coseners House, May 03
What is the origin of the Quark and lepton masses, mixing angles
and CP violating phases?
Underconstrained – need mixing angles but only VCKM measured.
Hierarchical structure strongly suggests a broken symmetry
Abelian Family symmetry
-3 2 1
Ramond et al,
Jack, Jones, …..
Large mixing… maximal?
Near Bi (-Tri) maximal mixing suggests Non-Abelian symmetry
capable of relating
C3, S3, A4…
Numerous suggestions for the symmetries of
Harrison, Scott, Perkins
Babu, Ma, Valle
But can such structures be consistent with all quark and lepton masses?
Barbieri et al,
Chkareuli, Froggattt, Nielsen
Various attempts :
Coefficients equal due to SU(2)
Extension to neutrinos???
Possible with “see-saw”
Origin of the hierarchy?
Froggatt Nielsen? Radiative corrections? New spatial dimensions?
The measurement of neutrino properties is testing our ideas about
the origin of flavour and raises interesting questions :
Is there a connection between quarks and leptons?
Origin of CP violation?
Probes RH angles
Vives, GGR, Velasco Sevilla
Neutrino texture zero ?