THE COLORFUL SEESAW Sogee Spinner University of Wisconsin-Madison 12 – April- 2011 The Role of Heavy Fermions in Fundamental Physics JHEP 1101 (2011) 046: P. Fileviez Perez, T. Han, SS, M. Trenkel Phys.Rev. D80 (2009) 053006 : P. Fileviez Perez, M. Wise
T h e C o l o r f u l S e e s a w. 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. - PowerPoint PPT Presentation
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THE COLORFUL SEESAW
Sogee SpinnerUniversity of Wisconsin-Madison
12 – April- 2011
The Role of Heavy Fermionsin Fundamental Physics
JHEP 1101 (2011) 046: P. Fileviez Perez, T. Han, SS, M. TrenkelPhys.Rev. D80 (2009) 053006 : P. Fileviez Perez, M. Wise
Pheno has been studied Gresham & Wise; Fileviez Perez, Gavin, McElmurry &Petriell0; Gerbush et al.;
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SCALAR COLOR OCTET Physical states:
Mass split by Higgs interactions: electroweak Mild coupling to down gives
fields fairly degenerate Decays:
For larger splitting, heavier S decay to W and lighter S, e.g.:
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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:
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FERMIONIC OCTET DECAYS For
Various decay lengths:Could also be R-hadron.
Or three-body decays
Decay length: scan over and mixings.
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DECAYS WITH TRI-BIMAXIMAL MIXINGS
No Phases NH: or channels always larger than
NH: and coincide
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GENERAL MIXING
Scanned over mixing angles and phases Not as predictive
NH: and channel still larger then
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OUTLINENeutrino Mass Models
The Colorful Seesaw Fields
The Colorful Seesaw at the LHC
Conclusion
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PRODUCTION: SIMILAR TO GLUINO
22 Still before MET cuts
SIGNALS LNV: same-sign dileptons
Final states of interests:
Leading background: One pair of like-sign tops decay semi-
leptonically
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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
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CONCLUSION Neutrino masses might lead to exciting LHC signals
Same-sign dileptons (LNV) with electroweak cross section
Colorful Seesaw 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