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SUSY after LHC 2011 Data: A Brief Look

SUSY after LHC 2011 Data: A Brief Look. 杨 金 民. 中国科学院 理论物理研究所. 重庆 2012.5.8. Outline. 1 Introduction. 2 Implication of LHC results on SUSY. Implication of sparticle search results. Implication of Higgs search results. 3 Conclusion and outlook. 1 Introduction.

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SUSY after LHC 2011 Data: A Brief Look

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  1. SUSY after LHC 2011 Data: A Brief Look 杨 金 民 中国科学院 理论物理研究所 重庆 2012.5.8

  2. Outline 1 Introduction 2 Implication of LHC results on SUSY • Implication of sparticle search results • Implication of Higgs search results 3 Conclusion and outlook

  3. 1 Introduction ---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 SUSY search results and implications 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 true ~  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 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. 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

  26. How about pphZZ* (WW*) at the LHC ?

  27. Implication for XENON100:

  28. 3 Conclusion and outlook From Higgs search (125 GeV Higgs):

  29. 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

  30. 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

  31. Thanks !

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