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Exploring New Physics with The Colorful Seesaw at LHC

Discover the role of heavy fermions in fundamental physics through The Colorful Seesaw model. Learn about neutrino mass models, the Colorful Seesaw fields, and potential signals at the LHC. Dive into Majorana schemes and various types of Seesaw mechanisms with exciting potential for LHC observations.

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Exploring New Physics with The Colorful Seesaw at LHC

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  1. TheColorfulSeesaw • 12 – April- 2011 The Role of Heavy Fermions in Fundamental Physics Sogee Spinner University of Wisconsin-Madison JHEP 1101 (2011) 046: P. Fileviez Perez, T. Han, SS, M. Trenkel Phys.Rev. D80 (2009) 053006 : P. Fileviez Perez, M. Wise

  2. Quest For BSM BSM

  3. BSM is Already Here: • Neutrino Masses: • Can be Dirac or Majorana: • Majorana: new heavy particles: Very exciting for LHC if MX~TeV

  4. Outline • Neutrino Mass Models • TheColorfulSeesaw Fields • TheColorfulSeesaw at the LHC • Conclusion

  5. Outline • Neutrino Mass Models • The Colorful Seesaw Fields • The Colorful Seesaw at the LHC • Conclusion

  6. Majorana Schemes • Generically: violates lepton number: • Possible same-sign dilepton signals • Type I: Fermion • Hard to produce without new interactions Minkowski; Yanagida; Gell-Mann et al.; Glashow; Mohapatra & Senjanovic Keung & Senjanovic; Han & Zhang; Aguila & Aguilar-Saavedra; Atre et al.; Kersten & Smirnov; Fileviez Perez et al. • Type II: Scalar • Producedvia vector bosons • Exciting signals from pair produced Konetschny & Kummer; Cheng & Li; Lazarides et al.; Schechter & Valle; Mohapatra & Senjanovic Fileviez Perez, Han, Huang, Li & Wang; Chun et al.; Garayoa & Schwetz; Akeroyd et al.; Huitu et al. • Type III: Fermion • Fermionic also through Drell-Yan Foot Lew, He & Joshi Franceschini et al; Arhrib, Bajc, Ghosh, Han, Huang, Puljak & Senjanovic; Li & He, Aguila & Aguilar-Saavedra

  7. Radiative Seesaw Zee ‘80 • Zee Model: Scalar and • , LNV not clear • One type of scalar and one type of fermion: Fileviez Perez, Wise ‘09

  8. Choose Colorless Fields Type I Seesaw Fractionally charged Fractionally charged Type III Seesaw

  9. Colorful Fields Type I Seesaw New Fractionally charged Fractionally charged Type III Seesaw New

  10. TheColorfulSeesaw • One massless neutrino • Allows normal hierarchy (NH): • And inverted hierarchy (IH):

  11. TheColorfulSeesaw Neutrino Masses: Loop Function Compare to TeV type I seesaw:

  12. Lepton Number Violation • Lepton number violation (LNV)requires • Lepton flavor violation (LFV) requires Order 1 Yν (Liao & Liu ‘10; Fileviez Perez, SS, Trenkel ‘11) Scanned over neutrino parameters.

  13. Outline • Neutrino Mass Models • TheColorfulSeesawFields • The Colorful Seesaw at the LHC • Conclusion

  14. Scalar Color Octet • So called Manohar-Wise (‘06) • Higgs doublet color adjoint • Couples to quarks just like Higgs • Therefore satisfies minimal flavor violation Ansatz (MFV) • Transforms as Higgs under flavor • Pheno has been studied Gresham & Wise; Fileviez Perez, Gavin, McElmurry &Petriell0; Gerbush et al.;

  15. Scalar Color Octet • Physical states: • Mass split by Higgs interactions: electroweak • Mild coupling to down gives • fieldsfairly degenerate • Decays: • For larger splitting, heavier S decay to W and lighter S, e.g.:

  16. Fermionic Octet • Quantum numbers of gluino (same production) • Decays governed by Yukawa coupling to Leptons • Use Casas-Ibarra (‘01) to relate : • is a complex matrix with • Assumed real, in normal hierarchy:

  17. Fermionic Octet Decays • Or three-body decays • For • Decay length: scan over and mixings. Various decay lengths: Could also be R-hadron.

  18. Decays with Tri-Bimaximal Mixings No Phases • NH: or channels always larger than • NH: and coincide

  19. General Mixing • Scanned over mixing angles and phases • Not as predictive • NH: and channel still larger then

  20. Outline • Neutrino Mass Models • The Colorful Seesaw Fields • TheColorfulSeesaw at the LHC • Conclusion

  21. Production: similar to Gluino

  22. Signals • LNV: same-sign dileptons • Final states of interests: • Leading background: • One pair of like-sign tops decay semi-leptonically • Still before MET cuts

  23. Number of Events for 10 fb-1: • Scanned over neutrino parameter • Signal > background even before cuts, up to • For 14 TeV, up to • Large particle multiplicity makes reconstruction challenging, but large number of events can make up for it

  24. Conclusion • Neutrino masses might lead to exciting LHC signals • Same-sign dileptons (LNV) with electroweak cross section • ColorfulSeesaw also has same-sign dileptonsbut strong cross sections. • One-loop seesaw mechanism • Scalar color octet, isospin doublet S • Fermionic color octet • More signal events than background up to • With luck, might also discriminate: NH, IH

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