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Yingchuan Li

Baryogenesis at Electroweak scale and EDM in MSSM. Yingchuan Li. University of Wisconsin, Madison. YL, S. Profumo, M. Ramsey-Musolf, PRD 78, 075009, 2008; PLB 673, 95, 2009. Pheno 2009. Outline. Electroweak baryogenesis in MSSM. Why ruled out in SM?. Why possible in MSSM?.

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Yingchuan Li

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  1. Baryogenesis at Electroweak scale and EDM in MSSM Yingchuan Li University of Wisconsin, Madison YL, S. Profumo, M. Ramsey-Musolf, PRD 78, 075009, 2008; PLB 673, 95, 2009. Pheno 2009

  2. Outline • Electroweak baryogenesis in MSSM • Why ruled out in SM? • Why possible in MSSM? • What does it require in MSSM? • The interplay between EWB and EDM in MSSM • Chargino-neutralino two-loop: the most relevant contribution; • Bino-driven EWB with highly suppressed EDMs; • Conclusion

  3. The origin of matter and energy • Baryon asymmetry of Universe: (BBN) (WMAP) • Sakharov conditions: • Baryon number violation; • C and CP violation; • Departure from thermal equlibrium.

  4. Scenarios of baryogenesis • Planck scale baryoenesis; • GUT baryogenesis; • Baryogenesis via leptogenesis; • Afleck-Dine baryogenesis; • Electroweak baryogenesis; most testable scenario!

  5. EWBG fails in SM, but viable in MSSM. • EWBG fails in SM: • Electroweak phase transition is not first order. • Not enough CP violation. • EWGB is viable in MSSM: • New bosonic degrees of freedom (stops) • help on 1st order phase transition. • New CP violation source exist in MSSM.

  6. EWB in MSSM • Strong 1st order phase transition: (Carena, et al. 2008) • Light Higgs: • Heavy LH stop: • Light RH stop: • Extra CP violation phase: • Chargino-neutralino sector: • Stop sector: Bino-driven Wino-driven

  7. EWB in MSSM • Resonant enhancement of CP violation: (Carena, et al. 1997,2001; Lee, et al. 2004) preferred ! • Chargino-neutralino scenario not preferred! • Stop scenario mA = 100 GeV mA = 150 GeV mA = 400 GeV Crucial parameters in chargino-neutralino scenario: Can large phases and small mass scales survive EDM bounds?

  8. EDM – probe of CP violation • Electric dipole moment: CPT P and T violation P and CP violation • Experimental searches: SM values Current bounds Future reach

  9. How to suppress various EDM? CP odd op. Phases Compatibility condition ? ? ? ? ? ? ? ? ? Not obvious. ? ? ? ? Full calculation is needed. ?

  10. Chargino-neutralino 2-loop EDM: diagrams • Complete diagrams: • Calculated: • Uncalculated:

  11. Chargino-neutralino 2-loop EDM: analytic result YL, S. Profumo, M. Ramsey-Musolf, arXiv:0806.2693

  12. Chargino-neutralino 2-loop EDM: numerical result • ZA and WH are dominant contributions Ref. point: YL, S. Profumo, M. Ramsey-Musolf, arXiv:0806.2693

  13. Chargino-neutralino 2-loop EDM: binov.s. wino contribution • Very different contribution • from bino and wino phases • Suppression is due to many aspects: • Neutralino only appears in WH and WW: 20% • In WH and WW: • Another factor of 0.3 is presumably from that, in WH and WW, • W boson only couple to wino and higgsino. YL, S. Profumo, M. Ramsey-Musolf, arXiv:0811.1987

  14. Comparing bino- and wino-driven EWB • Electron EDM: Ref. point: YL, S. Profumo, M. Ramsey-Musolf, arXiv:0811.1987

  15. Comparing bino- and wino-driven EWB • Neutron EDM: Ref. point: Bino-driven EWB can happen with highly suppressed EDMs! YL, S. Profumo, M. Ramsey-Musolf, arXiv:0811.1987

  16. Compatibility between EWB and EDM? CP odd op. phases Compatibility condition Not obvious. Bino-driven EWB scenario! YL, S. Profumo, M. Ramsey-Musolf, arXiv:0811.1987

  17. Conclusions & outlook • EWB in SM is ruled out, but EWB in MSSM, either • bino-driven or wino-driven, remains possible. • EWB in MSSM is strongly constrained by EDM experiments. • We calculate the full chargino-neutralino 2-loop EDMs, • which is the most relevant part to EWB in MSSM. • We observe that the bino-driven EWB is much less • constrained from EDM bounds than wino-driven EWB. • A scan over the full parameter space will give a lower bound • on EDM that is consistent with EWB. Thank you !!!

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