Higgs Boson Mass In SUSY Seesaw Model Jin Min Yang Based on: Cao, Yang ， Phys. Rev. D 71, 11170 （ 2005 ） [ hep-ph/0412315 ] Institute of Theoretical Physics,

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Presentation transcript:

Higgs Boson Mass In SUSY Seesaw Model Jin Min Yang Based on: Cao, Yang ， Phys. Rev. D 71, （ 2005 ） [ hep-ph/ ] Institute of Theoretical Physics, Academia Sinica, Beijing

Outline Physics Calculations Conclusion

Part I: Physics (1) Higgs boson SM: light Higgs  EW data MSSM: m h  m Z (tree-level) m h  130 GeV (loop-level)

(2) SUSY Seesaw Model  MSSM + R –superfields (+ see-saw mechanism)  SUSY See-saw Model

(3) Neutrino Yukawa coupling  large in SUSY see-saw model Loop effects of neutrino in Higgs sector ? Completely decouple at EW scale ??

(4) Recall top/stop loop effects m h  m Z m h  130 GeV Top/stop loop effects large Yukawa coupling SUSY breaking

Top/stop effects in h-mass

(5) Back to neutrino/sneutrino effects large Yukawa coupling (  ) Sizable effects sizable SUSY breaking ( ? ) R mass scale  M R >> weak scale SUSY breaking for R  soft-term  M R

(6) Split SUSY R soft-term  M R (near GUT scale)  incur fine-tuning problem  split SUSY

(7) Our result Neutrino/sneutrino contribution to m h: opposite to top/stop effects sizable (say -30 GeV) if

Comparison with top/stop effects: Top/stop  Neutrino/sneutrino 

Part II: Calculations (1) With R –superfield, additional term in W: 3  3 matrix in flavor space

(2) Neutrino sector Neutrino mass term:

2-component spinor  4-component spinor:

Neutrino Yukawa couplings:

(2) Sneutrino sector Soft breaking terms:

Sneutrino mass term:

Sneutrino Yukawa couplings:

(3) Feynman diagrams

(4) Calcultion results …

Part III: Conclusion SUSY see-saw model: neutrino/sneutrino loop effects lighten m h if

SUSYSplit-SUSY Split-SUSY see-saw 135 GeV 150 GeV 120 GeV (?)