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Testing Seesaw at LHC

Testing Seesaw at LHC. 郑亚娟. Outline. Mini-review of neutrino physics LHC signatures of Seesaw mechanism. Part I. Introduction. Beta decay. Neutral, spin ½, mass less than 1% of proton mass. Neutrino. Neutral, spin ½, less than 1% of proton mass. Neutrino.

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Testing Seesaw at LHC

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  1. Testing Seesaw at LHC 郑亚娟

  2. Outline • Mini-review of neutrino physics • LHC signatures of Seesaw mechanism

  3. Part I Introduction • Beta decay

  4. Neutral, spin ½, mass less than 1% of proton mass Neutrino

  5. Neutral, spin ½, less than 1% of proton mass Neutrino

  6. True picture: An electron antineutrino is emitted from beta decay

  7. Detection

  8. A decision in 1952: using neutrinos from a fission reactor A double signature (two flashes of light separated by a few )

  9. : Fermi Lab, 2000 BNL Lederman, Schwartz &Steinberger 1962 Cowan & Reins 1956 39 years 26 years 1995 1988

  10. Neutrino puzzles Solar neutrino Detected neutrino 1/3 Standard Solar Model 1968, Raymond Davis made the first observation of solar neutrino shortfall at Homestake mine Confirmed by Kamiokande, GALLEX, SAGE and SNO(2001) data R. Davis 2002

  11. Atmospheric neutrino Expected Detected

  12. Two flavor oscillation For simplicity, we consider two flavor neutrino mixing and oscillation

  13. The oscillation probability for an appearance neutrino experiment: The conversion and survival probability in realistic units: Due to the smallness of (1,3) mixing, both solar & atmospheric neutrino oscillations are roughly the 2-flavor oscillation.

  14. Flavor Mixing Flavor eigenstates Cabibbo-Kobayashi- Maskawa (CKM) Weak interaction eigenstates Mass eigenstates Flavor eigenstates Pontecorvo-Maki-Nakagawa-Sakata (PMNS)

  15. Normal Inverted Experimental bounds Two kinds of hierarchy ( normal & inverted)

  16. Mass Generation • SM + right-handed neutrino Unnatural

  17. Radiative mechanisms(S. Weinberg PRD1962, A. Zee PLB1980) • Texture zeros(H. Fritzsch PLB1977, S. Weinberg1977) • Family symmetries(C. Froggat & H. Nielsen NPB1979) • Seesaw mechanisms(P. Minkowski PLB1977) • Extra dimensions(K. Dienes, E.Dudas & T.Gherghetta NPB1999)

  18. Seesaw Mechanisms • Type-I : (SM +at least 2 RH Majorana neutrinos )

  19. Type-II : (SM +1 Higgs triplet )

  20. Type-III: (SM +3 fermion triplet ) • Hybrid seesaws: type-(I+II), type-(I+III) …

  21. Part II Type-(I+II) Seesaw SM + 2 right-handed Majorana neutrinos + 1 Higgs triplet SSB Diagnolization Seesaw formula

  22. Neutrino Mixing Tri-bimaximal mixing pattern After diagnolization Harrison et al, 02; Z. Z. Xing, 02; X. G. He & A. Zee, 03 Parameterization 3×3 unitary matrix Z. Z.Xing, 08 Nearly identity matrix with

  23. Flavor symmetry Conventional: Testable: Pilaftsis, 92；Kersten et al, 07 W. Chao, Z. G. Si, Z. Z.Xing, S. Zhou 08; W. Chao, S. Luo, Z. Z. Xing, S. Zhou 07 X. G. He, Y. Y. Keum & R. R.Volkas 06 a. Triplet Higgs observable b. Heavy Majorana neutrinos testable c. Neutrinos masses stable

  24. Collider Signatures T. Han & B. Zhang, 06; A. Atre, T. Han, S. Pascoli & B. Zhang,09

  25. Define:

  26. guarantees a peak around the mass of >114GeV CDF Collaboration, 08

  27. Summary Long Long Ago Far Far Away Thanks for your attention!

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