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Status of low energy SUSY models after LHC (7 TeV) Higgs data

Status of low energy SUSY models after LHC (7 TeV) Higgs data. Jin Min Yang. (ITP, Beijing). KITPC (2012.6.25). Outline. 1 Low energy SUSY. 2 Implication of LHC search data. 3 Conclusion and outlook. 1 Low energy SUSY. --- Warm up SUSY. What is SUSY. Why believe SUSY.

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Status of low energy SUSY models after LHC (7 TeV) Higgs data

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  1. Status of low energy SUSY models after LHC (7 TeV) Higgs data Jin Min Yang (ITP, Beijing) KITPC (2012.6.25)

  2. Outline 1 Low energy SUSY 2 Implication of LHC search data 3 Conclusion and outlook

  3. 1 Low energy SUSY --- Warm up SUSY • What is SUSY • Why believe SUSY • Models of SUSY

  4. What is SUSY ? Edward Witten

  5. Why believe SUSY ? Edward Witten • cosmic dark matter (WIMP)

  6. Edward Witten

  7. Models: Targets of LHC mSUGRA GMSB … … SUSY NMSSM AMSB MSSM

  8. 2 Implication of LHC search data LHC (7TeV, 5/fb) • Sparticle search results and implications • Higgs search results and implications

  9. 2.1 Sparticle search results at LHC ------ null results • First two generations of squarks > 1 TeV • If only 3rd generation sfermions are light, then • gluino > 600~800 GeV • 3rd generation squarks > 200~300 GeV

  10. Any implication from sparticle search results ? First two generations of squarks are heavy (> TeV) The 3rd generation squarks may still be light Low energy SUSY (MSUSY < TeV) seems not really … ~  Effective SUSY (Natural SUSY)

  11. 2.2 Higgs boson search results and implication • LHC: 3-sigma at 125 GeV (di-photon signal rate is above SM prediction) • Tevatron: 2.2-sigma in 115-135 GeV

  12. If a light fundamental Higgs boson exists, Then theoretically (naturalness, hierarchy problem): • SM is not a natural, comfortable place for Higgs • SUSY is a paradise for Higgs ---a peaceful, harmonious place for Higgs 125 GeV Higgs: support SUSY !

  13. SUSY: Mh < 90 GeV at tree-level Mh < 130 GeV at loop-level

  14. However, 125 GeV Higgs is not so comfortable for SUSY It needs loop effects (mainly from stops)  heavy stops little fine-tuning

  15. Let’s check Higgs mass in some SUSY Models: • CMSSM (mSUGRA, GMSB, AMSB,…) • MSSM, NMSSM, nMSSM, …

  16. Higgs mass in CMSSM/mSUGRA (≤125 GeV) Cao, Heng, Li, Yang, arXiv:1112.4391

  17. Higgs mass in AMSB (<125 GeV) Baer, Barger, Mustafayev, arXiv:1202.4038

  18. Higgs mass in GMSB (<125 GeV) Baer, Barger, Mustafayev, arXiv:1202.4038

  19. How to repair GMSB to give a 125 GeV Higgs ?

  20. One way to repair GMSB: Kang, Li, Liu, Tong, Yang, arXiv:1203.2336

  21. Higgs mass in MSSM, NMSSM, nMSSM (125 GeV OK !) Cao, Heng, Liu, Yang, arXiv:1103.0631

  22. Higgs decay to dark matter in SUSY Cao, Heng, Yang, Zhu, arXiv:1203.0694

  23. Higgs decay to dark matter in SUSY: detectable at LHC ? Cao, Heng, Yang, Zhu, arXiv:1203.0694

  24. Take a careful look at MSSM and NMSSM: Cao, Heng, Yang, Zhang, Zhu, arXiv:1202.5821 MSSM: NMSSM:

  25. arXiv:1202.5821

  26. How to enhance the di-photon rate at the LHC ? gg  h   to enhance B(h) hgg coupling not enhanced NMSSM: it is easy • h-b-b coupling can be suppressed • so B(h) can be enhanced MSSM:it is hard • h-b-b coupling cannot be suppressed • need a light stau to enhance h coupling

  27. arXiv:1202.5821

  28. How about pphZZ* (WW*) at the LHC ? arXiv:1202.5821

  29. Implication for XENON100: arXiv:1202.5821

  30. Finally, comparison for CMSSM, MSSM, NMSSM, nMSSM

  31. 3 Conclusion and outlook From Higgs search (125 GeV Higgs):

  32. From sparticle search: First two generations of squarks are heavy (> TeV) The 3rd generation squarks may still be light Higgs search: Sparticle search: • Natural SUSY + NMSSM = Natural NMSSM

  33. Some guess (outlook): Discover stop, sbottom and gluino (but no other squarks)  Natural SUSY Discover gluino and/or chargino (but no any sfermions)  Split-SUSY Discover nothing (no sparticles)  High-scale SUSY

  34. Thanks !

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