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Neutrino Seesaw Models at the LHC

Neutrino Seesaw Models at the LHC. Xiao-Gang He Department of Physics and Center for Theoretical Sciences National Taiwan University Talk at USTC, April 15 The Seesaw Mechanism Type II Seesaw at the LHC Small light and heavy mixing in Type I and III at the LHC

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Neutrino Seesaw Models at the LHC

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  1. Neutrino Seesaw Models at the LHC Xiao-Gang He Department of Physics and Center for Theoretical Sciences National Taiwan University Talk at USTC, April 15 The Seesaw Mechanism Type II Seesaw at the LHC Small light and heavy mixing in Type I and III at the LHC New possibility, large mixing, for Type-I and III seesaw at LHC Conclusions

  2. 1. The Seesaw Mechanism

  3. Minkowski; Yanagida; Gell-Man, Ramond and Slansky…

  4. What LHC can do for neutrino physics? A lot. One of them is to probe the heavy degree of freedom in models producing neutrino masses and mixing. Production of new particles, the most direct test! T.~Han and B.~Zhang, Heavy neutrino t LHC [arXiv:hep-ph/0604064]; M. Nebot et al., Zee Model arXiv:0711.0483 [hep-ph]]. R.~Franceschini et al.,Type-III [arXiv:0805.1613 [hep-ph]]. F.~del Aguila etal., Type I, II, III [arXiv:0808.2468 [hep-ph]]. P.~Fileviez Perez et al., Type-II [arXiv:0805.3536 [hep-ph]]; A.~Arhrib et al.,Type I+III Seesaw, arXiv:0904.2390 [hep-ph]; W.~Chao et al., Type I +II [arXiv:0804.1265 [hep-ph]]; X.-G. He et al., Type I and III, arXiv: 0908.1607[hep-ph] X.-G. He and Ernest Ma, arXiv:0907.2737[hep-ph] T. Li and X.-G. He., Type III, arXiv:0907.4193[hep-ph].

  5. 2. Type II Seesaw at the LHC

  6. Del Aguila and Aguilar-Saavedra

  7. P. Perez et al.

  8. 3. Small light and heavy mixing in Type I and III at the LHCSome features about Type I and III Seesaw Models

  9. Type-I seesaw at LHC

  10. V_{lN} ~ (m_\nu/m_N)^{1/2} < 10^{-6} for one generation. Too small!

  11. Neutrino MixingSchwetz et.al, Gonzalez-Garcia et. Al, Goswami et.al. Strumia et al.

  12. Real angle wij -> small mixing solution. Complex angle, can have large mixing solution.

  13. Even with small V_{lN} Type-III seesaw can be tested at the LHCTong Li and Xiao-Gang He, arXiv:0907.4193[hep-ph]

  14. 4. New possibility, large mixing, for Type-I and III seesaw at LHCX.-G. He et al., arXiv:0907.1607[hep-ph] (earlier work: Smirnov and Kersten)

  15. Some sample solutions

  16. For U_{\nu U} of order 0.03, the cross section can be as large as 1 fb for m_N up to 150 GeV. Not hopelessly small! For Type III Seesaw, no displayed vertex!

  17. If m_N < m_h, affect Higgs decay Br. Park, Wang and Yanagida, arXiv:0909.2937; Chen et al. arXiv:1001.5215

  18. Model realization for large light and heavy mixingX.-G. He and E. Ma, arXiv:0907.2737[hep-ph]

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