1. Quark and lepton masses
G.G.Ross, DESY, Sept 03

2. DATA : ? GeV 1 Bi-Tri Maximal Mixing … Non Abelian Structure? Masses
10-1
10-2
10-3
10-4 eV
Bi-Tri Maximal
Mixing …
Non Abelian
Structure?

3. DATA : ? GeV 1 Masses† Mixing † † Simple(?) flavour Group restricting
Yukawa couplings

4. Non-Abelian family symmetry
To relate different matrix elements need
a non-Abelian structure, e.g.
e.g.
Form determined by additional symmetries
e.g. Z5XZ3XZ2

5. Quarks
Symmetric fit
Roberts
Romanino
GGR
Velasco Sevilla =

6. Messenger mass (Universal masses natural for Wilson line breaking)
Froggatt, Nielsen
(Universal masses natural for Wilson line breaking)

7. Extension to charged leptons – GUT?
Georgi Jarlskog

8. Possible with “see-saw”
100
10-1 10
10-2
10-3
10-4 eV
Bi-Tri maximal mixing?
Possible with “see-saw”
Dirac Mass
Magnitude ordered by Z5XZ2
Majorana Mass

9. Vacuum alignment

10. Summary
Neutrino masses, gauge coupling unification, proton decay point to GUT
with high unification scale.
Extraction of Yukawa couplings crucial to understanding fermion structure
Bounded off diagonal terms (anti)symmetric, hermitian 
SUSY CP
 
Vives, GGR

11. Summary
Neutrino masses, gauge coupling unification, proton decay point to GUT
with high unification scale….1st quantitative evidence for superstring unification?
Extraction of Yukawa couplings crucial to understanding fermion structure
Bounded off diagonal terms (anti)symmetric, hermitian 
SUSY CP
 
Texture and texture zero hints at underlying structure
Family symmetry ? GUT symmetry?
(1,1) neutrino texture zero :

12. Summary
Neutrino masses, gauge coupling unification, proton decay point to GUT
with high unification scale….1st quantitative evidence for superstring unification?
Extraction of Yukawa couplings crucial to understanding fermion structure
Bounded off diagonal terms (anti)symmetric, hermitian 
SUSY CP
 
Texture and texture zero hints at underlying structure
Family symmetry ? GUT symmetry?
Due to the see-saw mechanism, the quark, charged lepton and neutrino
masses and mixing angles can be consistent with a similar structure for
their Dirac mass matrices.
Hints at an underlying (spontaneously broken) family symmetry? SO(10)XSU(3)?
100
10-1 10
10-2
10-3
10-4 eV

13. Summary
Neutrino masses, gauge coupling unification, proton decay point to GUT
with high unification scale….1st quantitative evidence for superstring unification?
Extraction of Yukawa couplings crucial to understanding fermion structure
Bounded off diagonal terms (anti)symmetric, hermitian 
SUSY CP
 
Texture and texture zero hints at underlying structure
Family symmetry ? GUT symmetry?
Due to the see-saw mechanism, the quark, charged lepton and neutrino
masses and mixing angles can be consistent with a similar structure for
their Dirac mass matrices.
Hints at an underlying (spontaneously broken) family symmetry? SO(10)XSU(3)?
gives a new solution to the SUSY FCNC problem

14. Ramage,GGR

16. Summary
Neutrino masses, gauge coupling unification, proton decay point to GUT
with high unification scale….1st quantitative evidence for superstring unification?
Extraction of Yukawa couplings crucial to understanding fermion structure
Bounded off diagonal terms (anti)symmetric, hermitian 
SUSY CP
 
Texture and texture zero hints at underlying structure
Family symmetry ? GUT symmetry?
Due to the see-saw mechanism, the quark, charged lepton and neutrino
masses and mixing angles can be consistent with a similar structure for
their Dirac mass matrices.
Hints at an underlying (spontaneously broken) family symmetry? SO(10)XSU(3)?
gives a new solution to the SUSY FCNC problem
SUSY CP problem
Vives, GGR, Velasco Sevilla
If SUSY spontaneously broken in flavon sector SUSY CP violating angles naturally small