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Seesaw 25

Seesaw 25. Paris, 10-11/06/04. P. Binétruy, APC, Paris. SEESAW 25 The program. Thursday June 10th Morning Session Chairman P. Frampton (Univ. of North Carolina) 09:30 Welcome P. Binétruy (LPT, Orsay & APC, Paris)

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Seesaw 25

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  1. Seesaw 25 Paris, 10-11/06/04 P. Binétruy, APC, Paris

  2. SEESAW 25 The program Thursday June 10th Morning Session Chairman P. Frampton (Univ. of North Carolina) 09:30 Welcome P. Binétruy (LPT, Orsay & APC, Paris) 09:40 Seesaw and the riddle of massP. Ramond (Gainesville) 10:20 LeptogenesisT. Yanagida (Tokyo) 11:00 Coffee break 11:30 Various realizations of the seesaw mechanismR.N. Mohapatra (Maryland) 12:00 Seesaw mechanism and GUTsG. Senjanovic (Trieste) Afternoon Session (1) Chairman S. Bilenky (SISSA, Trieste) 14:30 The experimental evidence for neutrino massK. Heeger (Berkeley) 15:10 Textures and flavour modelsG.G. Ross (Oxford) 15:40 Seesaw mechanism and renormalization group effectsM. Lindner (Munich) 16:10 Coffee break Afternoon Session (2) Chairman E. Ma (Univ. of California, Riverside) 16:40 Seesaw mechanism and supersymmetryA. Masiero (Padua) 17:10 CP violation in the seesaw mechanismJ. Hisano (Tokyo)

  3. Friday June 11th Morning Session (1) Chairman R. Hahn (Brookhaven Nat. Lab.) 09:00 13and CP violation in the lepton sectorC. Hagner (Hamburg) 09:30 Seesaw mechanism and the baryon asymmetryM. Raidal (Tallinn) 10:00 Various realizations of leptogenesis and neutrino mass constraints Th. Hambye (Oxford) 10:30 Coffee break Morning Session (2) Chairman G. Raffelt (MPI, Munich) 11:00 Seesaw mechanism and extra dimensionsE. Dudas (Orsay) 11:30 Neutrinos and astrophysicsS. Hannestad (Odense) 12:00 Detectors for low-energy neutrinos and CDMS. Schoenert (Heidelberg) Afternoon Session Chairman C. Albright (Fermilab) 14:00 Seesaw mechanism beyond neutrino physicsT. Appelquist (Yale) 14:30 Alternatives to the seesaw mechanism A. Yu. Smirnov (Trieste) 15:00 Searching for the absolute neutrino mass scale Ch. Weinheimer (Bonn) 15:30 Can one reconstruct the seesaw parameters? S. Davidson (Durham) 16:00 Coffee break 16:30 Round table Moderator J. Orloff (LPC, Clermont-Ferrand) « How to probe the origin of neutrino masses? » G. Gratta (Stanford) - B. Kayser (Fermilab) - S. Raby (Columbus) - J.W.F. Valle (Valencia) - Ch. Wetterich (Heidelberg)

  4. The seesaw mechanism places the neutrino center stage : Lepton Flavour violations SUSY Extra dimensions Masiero Gravitino problem  Dudas Inflation M =mLT MR-1 mL Yanagida Left-Right symmetry Mohapatra Leptogenesis GUT Hambye, Raidal, Lindner Flavor symmetries Senjanovic, Lindner Ramond, Ross

  5. The seesaw mechanism places the neutrino center stage :  M =mLT MR-1 mL Left-Right symmetry Mohapatra GUT Flavor symmetries Senjanovic, Lindner Ramond,Ross

  6. Mohapatra seesawthors

  7. Courtesy of Daniel Vignaud

  8. Mohapatra GUTS LR

  9. Lindner Importance of renormalization group effects

  10. A new perspective for the seesaw mechanism : Bla Bla Ross

  11. Need to identify the absolute mass scale ! Ramond

  12. THE ABSOLUTE VALUES OF NEUTRINO MASSES FROM COSMOLOGY NEUTRINOS AFFECT STRUCTURE FORMATION BECAUSE THEY ARE A SOURCE OF DARK MATTER NEUTRINOS AFFECT STRUCTURE FORMATION BECAUSE THEY ARE A SOURCE OF DARK MATTER HOWEVER, eV NEUTRINOS ARE DIFFERENT FROM CDM BECAUSE THEY FREE STREAM SCALES SMALLER THAN dFS DAMPED AWAY, LEADS TO SUPPRESSION OF POWER ON SMALL SCALES S. Hannestad

  13. mn = 0 eV mn = 1 eV mn = 0 eV Ma ’96 mn = 7 eV mn = 4 eV

  14. BEST FIT TO DATA IS NOT AT mn = 0, EVEN IF NO INFORMATION ON BIAS IS USED HOWEVER, mn = 0 IS NOT EXCLUDED EVEN AT 2s THE PRESENT UPPER BOUND ON NEUTRINO MASS IS Warning : THERE COULD BE MORE THAN ONE NON-STANDARD EFFECT, SEVERELY BIASING THE PARAMETER ESTIMATE S. Hannestad

  15. C. Weinheimer

  16. from C. Weinheimer

  17. Ross : Ramond

  18. The seesaw mechanism places the neutrino center stage : SUSY Gravitino problem  Inflation M =mLT MR-1 mL Yanagida Leptogenesis Hambye, Raidal, Lindner

  19. Yanagida

  20. Matter is created at the end of inflation Yanagida

  21. But gravitinos are produced by thermal scattering processes after inflation TR < 104-5 GeV for m3/2 ~ TeV Yanagida favors light gravitino: 100 keV < m3/2 < 10 GeV

  22. The seesaw mechanism places the neutrino center stage : Lepton Flavour violations SUSY Extra dimensions Masiero  Dudas M =mLT MR-1 mL

  23. Masiero BLABL A

  24. Masiero

  25. Typology of seesaw or Seesaw or not seesaw? Type I Type II or induced triplet? Magg, Wetterich ‘80 Hambye

  26. Can one test the seesaw idea? NO ! • One cannot test a mechanism. • One can only test a theory, i.e. the realization of this mechanism in an explicit theory

  27. More doubts if light sterile neutrinos are found (LSND/MiniBOONE) neutrino mass spectrum turns out to be quasi-degenerate Again, both these features can be accommodated in seesaw: Seesaw + additional symmetry -> three active + 1 sterile neutrino R.Mohapatra - Seesaw I + symmetry (e.g., SO(3)) - seesaw II + symmetry - ``cascade seesaw’’: S.Petcov, A.S. E.Ma J. Valle 0 mD 0 mn = mD 0 MD 0 MD M If MD = A mD, and M = M0I mn ~ M0 /A2 I A Yu Smirnov

  28. 2. No way to prove? Will not prove that seesaw is the main mechamism Discovery of the neutrinoless double beta decay Leptogenesis Difficult to test also In SUSY context: lepton violating decays, EDM, ... Indirect, assumptions... Easy to disprove seesaw as the dominant mechanism of neutrino mass generation A Yu Smirnov

  29. Roundtable : C. Wetterich • Induced triplet (type II seesaw) mechanism dominates if : • maximal - mixing from generation symmetry (1 - sin2  < 0.01) • degenerate neutrino masses Heated debate around these statements….

  30. 25 years later, the seesaw mechanism is alive and well

  31. Thanks to the local organizing committee, in particular S. Lavignac, J. Dumarchez and I. Cossin

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