1 / 44

Supersymmetry and Its Experimental Tests

Supersymmetry and Its Experimental Tests. K.S. Babu Department of Physics, Oklahoma State University. DPF 2003 Annual Meeting Of The Division Of Particles And Fields (DPF) Of The American Physical Society (APS) Philadelphia, April 6, 2003. Outline. Motivations Supersymmetry Breaking

gari
Download Presentation

Supersymmetry and Its Experimental Tests

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Supersymmetry and Its Experimental Tests K.S. Babu Department of Physics, Oklahoma State University DPF 2003 Annual Meeting Of The Division Of Particles And Fields (DPF) Of The American Physical Society (APS) Philadelphia, April 6, 2003

  2. Outline Motivations Supersymmetry Breaking Direct Tests at Colliders Indirect Tests • Rare B Decays • Dipole Moments • Lepton Flavor Violation SUSY GUTs and Proton Decay Conclusions

  3. Stability of Higgs Mass With SUSY, Quadratic Divergence Cancels

  4. With SUSY, gauge boson contribution is cancelled by gaugino contribution.

  5. SUSY Spectrum Spin = 0 Spin = 1/2 Spin = 0 Spin = 1/2 Spin = 1 Spin = 1/2

  6. Evolution of Gauge Couplings In Standard Model

  7. Evolution of Gauge Couplings in six-Higgs-doublet SM S. Willenbrock, hep-ph/0302168

  8. Gauge Coupling Unification in MSSM

  9. Structure of Matter Multiplets

  10. MSSM Lagrangian R-parity Violation: Potentially Dangerous Proton Decay Soft SUSY Breaking: Generic soft breaking leads to large flavor violation

  11. Natural R-parity and μ-term Discrete gauge symmetries can protect μ-term and act as R-parity. I. Gogoladze, K. Wang, KB hep-ph/0212245 Z4 Model L. Krauss, F. Wilczek, (1989) L. Ibanez. G. Ross, (1991) T. Banks, M. Dine, (1992) Anomalies Green-Schwarz Anomaly Cancellation Mechanism For ZN Guidice-Masiero Mechanism

  12. SUSY Breaking Scenarios • Gravity Mediated ► mSUGRA ► Anomaly Mediation ► Flavor Symmetry • Gauge Mediated mSUGRA GMSB Neutralino LSP Stable (Dark Matter) { m0 , m1/2 , μ , A0 , B0 } { Λ, M, μ, n } LSP : Gravitino

  13. F. Paige, hep-ph/0211017

  14. B→μ+ μ-Decay in Supersymmetry Kolda, KB (1999) MSSM is a general two-Higgs-doublet model.

  15. Hall, Rattazzi, Sarid (1993)

  16. SUSY CP Violation in Decay

  17. Kane, et al, hep-ph/0212092

  18. Lepton Dipole Moments

  19. SUSY Contributions:

  20. S. Baek, P. Ko, W. Song, hep-ph/0210373

  21. Electric Dipole Moments Violates CP Electron: Neutron: Phases in SUSY breaking sector contribute to EDM.

  22. SUSY Contributions: A, B are complex in MSSM Effective SUSY Phase

  23. If parity is realized asymptotically, EDM will arise only through non-hermiticity induced by RGE. Subject to experimental tests Dutta, Mohapatra, KB (2001)

  24. Lepton Flavor Violation and Neutrino Mass Seesaw mechanism naturally explains small n-mass. Current neutrino-oscillation data suggests Flavor change in neutrino-sector Flavor change in charged leptons In standard model with Seesaw, leptonic flavor changing is very tiny.

  25. In Supersymmetric Standard model For nR active flavor violation in neutrino sector Transmitted to Sleptons Borzumati, Masiero (1986) Hall, Kostelecky, Raby (1986) Hisano, et al (1995) SUSY Seesaw Mechanism If B-L is gauged, MR must arise through Yukawa couplings. Flavor violation may reside entirely in f or entirely in Yn

  26. If flavor violation occurs only in Dirac Yukawa Yn (with mSUGRA) If flavor violation occurs only inf (Majorana LFV) LFV in the two scenarios are comparable. More detailed study is needed.

  27. Neutrino Fit For Majorana LFV scenario, take Dutta, Mohapatra, KB 2002

  28. For Dirac LFV scenario Same neutrino oscillation parameters as in Majorona LFV The two scenarios differ in predictions for

  29. Dirac LFV F. Deppisch, et al, hep-ph/0206122

  30. Majorana LFV Dutta, Mohapatra, KB (2002)

  31. Nucleon Decay in SUSY GUTs Gauge boson Exchange

  32. Higgsino Exchange Sakai, Yanagida, Weinberg (1982)

  33. MSSM Higgs doublets have color triplet partners in GUTs. must remain light must have GUT scale mass to prevent rapid proton decay Doublet-triplet splitting Even if color triplets have GUT scale mass, d=5 proton decay is problematic.

  34. Symmetry Breaking SUSY SU(5) FINE-TUNED TO O(MW) • The GOOD • Predicts unification of couplings • Uses economic Higgs sector • The BAD • Unnatural fine tuning • Large proton decay rate

  35. SUSY SO(10) B-L VEV gives mass to triplets only (DIMOPOULOS-WILCZEK) If 10H only couples to fermions, no d=5 proton decay Doublets from 10H and 10’H light 4 doublets, unification upset Add mass term for 10’H

  36. SO(10) Quarks and leptons ~{16i} ContainsnR and Seesaw mechanism Higgs ~ Fits the atmospheric neutrino data well

  37. Realistic SO(10) Model Pati, Wilczek, KB (1998)

  38. Predictions

  39. Conclusions • Supersymmetry: attractive candidate to stabilize Higgs mass • Suggested by gauge coupling unification • Before direct discovery, SUSY can show up in: ► Lepton flavor violation (meg, tmg) ► BS→μ+ μ-Decay ► Muon g-2 ► de, dn ► Proton decay ► Dark matter

More Related