Exploring Lepton Flavor Violating Higgs Decays in Multi Higgs Models

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Delve into the intriguing possibilities of off-diagonal Higgs couplings to leptons in the context of Multi Higgs Models, examining constraints and observable rates. Avital Dery's research sheds light on the potential scenarios and implications for future observations at the LHC.

  • Lepton Flavor Violating
  • Higgs Decays
  • Multi Higgs Models
  • LHC Resonance
  • Observable Rates
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  1. AsymmetricLepton Flavor Violating Higgs Decays AvitalDery S. Bressler, AD, A. Efrati, Phys. Rev. D 90 015025 (2014) Editors Selection arXiv:1405.4545

  2. Does the Higgs couple off-diagonally to leptons? (2012 LHC resonance) Avital Dery, Multi Higgs Models, 2/9/14 2

  3. Can the Higgs couple off-diagonally to leptons? (2012 LHC resonance) ?? not likely to be observed. Strong (model dependent) bound : BR ? ?? 5.7 10 13[MEG arXiv:1303.0754] => BR ?? O 10 9 Avital Dery, Multi Higgs Models, 2/9/14 3

  4. Can the Higgs couple off-diagonally to leptons? ?? not likely to be observed. Strong (model dependent) bound : BR ? ?? 5.7 10 13[MEG arXiv:1303.0754] ?? or ?? can exist in observable rates. compatible with all current bounds. BR ? ? O(10 8) => BR ?? O 10 9 => BR ? O 10% Avital Dery, Multi Higgs Models, 2/9/14 3

  5. Can the Higgs couple off-diagonally to leptons? ?? not likely to be observed. Strong (model dependent) bound : BR ? ?? 5.7 10 13[MEG arXiv:1303.0754] ?? or ?? can exist in observable rates. compatible with all current bounds. BR ? ? O(10 8) => BR ?? O 10 9 => BR ? O 10% ?? and ?? cannot coexist in observable rates. assuming no cancellations , ?????? < 1.7 10 7 ? ? ??? ??? [R. Harnik, J. Kopp and J. Zupan, JHEP 1303, 026 (2013) arXiv:1209.1397] => BR ?? BR( ??) O(10 11) Avital Dery, Multi Higgs Models, 2/9/14 3

  6. Can the Higgs couple off-diagonally to leptons? ?? not likely to be observed. Strong (model dependent) bound : BR ? ?? 5.7 10 13[MEG arXiv:1303.0754] ?? or ?? can exist in observable rates. compatible with all current bounds. BR ? ? ?(10 8) => BR ?? O 10 9 => BR ? O 10% ?? and ?? cannot coexist in observable rates. assuming no cancellations , ?????? < 1.7 10 7 ? ? ??? ??? [R. Harnik, J. Kopp and J. Zupan, JHEP 1303, 026 (2013) arXiv:1209.1397] => BR ?? BR( ??) O(10 11) For all practical purposes, we can expect to observe either ??, or ??. (or neither) Avital Dery, Multi Higgs Models, 2/9/14 3

  7. Does the Higgs couple off-diagonally to leptons? [CMS-PAS-HIG-14-005] CMS see a 2.5? excess of ?? candidate events [CMS-PAS-HIG-14-005] +0.40)% Best fit point: ?? ?? = (0.89 0.37 Interpreted as a limit: no direct bound for BR ??yet. ?? ?? < 1.57% order of magnitude better than previous indirect bounds Avital Dery, Multi Higgs Models, 2/9/14 4

  8. Does the Higgs couple off-diagonally to leptons? [CMS-PAS-HIG-14-005] CMS see a 2.5? excess of ?? candidate events [CMS-PAS-HIG-14-005] +0.40)% Best fit point: ?? ?? = (0.89 0.37 Interpreted as a limit: no direct bound for BR ??yet. ?? ?? < 1.57% order of magnitude better than previous indirect bounds If ?? ? 0 is established: clear signal of NP. challenge for frameworks of flavor. Avital Dery, Multi Higgs Models, 2/9/14 4

  9. ? and Flavor [AD, A. Efrati, Y. Nir, Y. Soreq, V. Susic, arXiv:1408.1371 ] 5 Avital Dery, Multi Higgs Models, 2/9/14

  10. ? and Flavor [AD, A. Efrati, Y. Nir, Y. Soreq, V. Susic, arXiv:1408.1371 ] Flavor models relate off-diagonal couplings in a given sector. 5 Avital Dery, Multi Higgs Models, 2/9/14

  11. ? and Flavor [AD, A. Efrati, Y. Nir, Y. Soreq, V. Susic, arXiv:1408.1371 ] Flavor models relate off-diagonal couplings in a given sector. Froggatt-Nielsen (FN) mechanism: Non trivial to generate observable rates for ? . SM or MHDM field content + non- renormalizable terms do not suffice. Natural models that can saturate the current bounds exist in the context of SUSY, where holomorphic zeros allow to avoid FCNCs. 5 Avital Dery, Multi Higgs Models, 2/9/14

  12. ? and Flavor [AD, A. Efrati, Y. Nir, Y. Soreq, V. Susic, arXiv:1408.1371 ] Flavor models relate off-diagonal couplings in a given sector. Froggatt-Nielsen (FN) mechanism: Non trivial to generate observable rates for ? . SM or MHDM field content + non- renormalizable terms do not suffice. Natural models that can saturate the current bounds exist in the context of SUSY, where holomorphic zeros allow to avoid FCNCs. Minimal Lepton Flavor Violation (MLFV): The simplest version of MLFV, where there is only one spurion, predicts zero off-diagonal couplings. Neutrino related spurions generate off-diagonal couplings. However, in order to approach the current bounds, non-generic parameter relations must exist. 5 Avital Dery, Multi Higgs Models, 2/9/14

  13. Searching for? ???? Avital Dery, Multi Higgs Models, 2/9/14 6

  14. Searching for? ???? Naively - look for a bump in the reconstructed mass distribution. Estimating the BG accurately is difficult: The signal lies in a transitional region between differently shaped contributions Uncertainty in the modelling of the Z tail ? ?? Diboson Avital Dery, Multi Higgs Models, 2/9/14 6

  15. Searching for? ???? We suggest a fully data driven method: Final state: ?,?,??? Avital Dery, Multi Higgs Models, 2/9/14 7

  16. Searching for? ???? We suggest a fully data driven method: Final state: ?,?,??? Divide the data into two mutually exclusive samples: ?? ?? call the electron 0, the muon 1 call the muon 0, the electron 1 ?? ?? ?> ?? ? ?> ?? ? Avital Dery, Multi Higgs Models, 2/9/14 7

  17. Searching for? ???? We suggest a fully data driven method: Final state: ?,?,??? Divide the data into two mutually exclusive samples: ?? ?? call the electron 0, the muon 1 SM prediction: ? ? symmetry. Gauge interactions are universal. ??-independent differences between electrons and muons (phase space, efficiencies, detector effects) do not induce an asymmetry since the final state has both objects. ?? ?? ?> ?? ? ?> ?? ? call the muon 0, the electron 1 Avital Dery, Multi Higgs Models, 2/9/14 7

  18. Searching for? ???? We suggest a fully data driven method: Final state: ?,?,??? Divide the data into two mutually exclusive samples: ?? ?? call the electron 0, the muon 1 SM prediction: ? ? symmetry. Gauge interactions are universal. ??-independent differences between electrons and muons (phase space, efficiencies, detector effects) do not induce an asymmetry since the final state has both objects. ?? ?? ?> ?? ? ?> ?? ? call the muon 0, the electron 1 ? ? = SM SM ? ? Avital Dery, Multi Higgs Models, 2/9/14 7

  19. Searching for? ???? We suggest a fully data driven method: Final state: ?,?,??? Divide the data into two mutually exclusive samples: ?? ?? call the electron 0, the muon 1 Signal prediction: ? ?asymmetry. ?? ?? ?> ?? ? ?> ?? ? call the muon 0, the electron 1 Avital Dery, Multi Higgs Models, 2/9/14 7

  20. Searching for? ???? We suggest a fully data driven method: Final state: ?,?,??? Divide the data into two mutually exclusive samples: ?? ?? call the electron 0, the muon 1 Signal prediction: ? ?asymmetry. ?? ?? ?> ?? ? ?> ?? ? call the muon 0, the electron 1 ? ??? Will appear in the ?? sample: ?? ? ? ?? ? Avital Dery, Multi Higgs Models, 2/9/14 7

  21. Searching for? ???? We suggest a fully data driven method: Final state: ?,?,??? Divide the data into two mutually exclusive samples: ?? ?? call the electron 0, the muon 1 Signal prediction: ? ?asymmetry. ?? ?? ?> ?? ? ?> ?? ? call the muon 0, the electron 1 ? ??? Will appear in the ?? sample: ? ??? Will appear in the ?? sample: ?? ?? ? ? ? ?? ? ?? ? ? Avital Dery, Multi Higgs Models, 2/9/14 7

  22. AsymmetricLepton Flavor Violating Higgs Decays SM Background ??sample ??sample Avital Dery, Multi Higgs Models, 2/9/14 9

  23. AsymmetricLepton Flavor Violating Higgs Decays SM Background ??sample ??sample simulation simulation ???1 ?+ ??? ??? ? ??? ? ??????????= ??0 Avital Dery, Multi Higgs Models, 2/9/14 9

  24. AsymmetricLepton Flavor Violating Higgs Decays SM Background simulation ???1 ?+ ??? ??? ? ??? ? ??????????= ??0 Avital Dery, Multi Higgs Models, 2/9/14 9

  25. AsymmetricLepton Flavor Violating Higgs Decays SM Background + BR(? ??) = ?% Statistical model to capture the amount of asymmetry Simulation Sensitive to the difference of branching ratios ?? ?? ??( ??) Leading uncertainty stems from statistics sensitivity will improve with more data Avital Dery, Multi Higgs Models, 2/9/14 10

  26. AsymmetricLepton Flavor Violating Higgs Decays Expected 3? sensitivity Avital Dery, Multi Higgs Models, 2/9/14 11

  27. end Avital Dery, Multi Higgs Models, 2/9/14 27

  28. Avital Dery, Multi Higgs Models, 2/9/14 29

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