1 / 18

Neutrinos and Flavour

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.

marvin-holcomb
Download Presentation

Neutrinos and Flavour

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 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?

  2. Masses 1 GeV THEORY : DATA : ? Mixing

  3. Data Theory ? Hierarchy Democracy Underconstrained – need mixing angles but only VCKM measured.

  4. Hierarchy

  5. Data Theory Symmetric fit Roberts Romanino GGR Velasco Sevilla Asymmetric fit

  6. Extension to charged leptons – GUT? Georgi Jarlskog

  7. FAMILY SYMMETRY? MESSENGER SECTOR? Family symmetries Hierarchical structure strongly suggests a broken symmetry Froggatt, Nielsen

  8. 1 -1 -1 -1   Abelian Family symmetry  -3 2 1 -3 2 1 Ibanez GGR  

  9. Asymmetric charge assignment : } Ramond et al, Jack, Jones, ….. Large mixing… maximal?

  10. Non-Abelian family symmetry Near Bi (-Tri) maximal mixing suggests Non-Abelian symmetry capable of relating Candidate group? C3, S3, A4… Numerous suggestions for the symmetries of Harrison, Scott, Perkins Babu, Ma, Valle Wetterich… But can such structures be consistent with all quark and lepton masses? Barbieri et al, Chkareuli, Froggattt, Nielsen King, GGR…. Various attempts : U(2), U(3)

  11. 3 King, GGR  Coefficients equal due to SU(2) family symmetry  ?  ?

  12. 10 100 10-1 10-2 10-3 10-4 eV Extension to neutrinos??? Possible with “see-saw” Dirac Mass Majorana Mass King, GGR

  13. Is there a family symmetry? Abelian? Non-Abelian? Origin of the hierarchy? Froggatt Nielsen? Radiative corrections? New spatial dimensions? Tests? SUMMARY 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? GUT? Origin of CP violation? Spontaneous?

  14. TESTS? Probes RH angles Vives, GGR, Velasco Sevilla

  15. } Neutrino texture zero ? Casas, Ibarra CHOOZ Ibarra, GGR 2β decay, leptogenesis

  16. (SUSY) Textures : FCNC, CP constraints Vives, GGR

More Related