1. Kaluza-Klein Electroweak Dark matter Dong Woo Kang (SKKU) T. Flacke, DWK, K. C. Kong, G. M. Mohlabeng, S. C. Park arXiv:1503.xxxxx Exploring the Dark Sector 20151

2. Outline UED review Model setup Phenomenology and precision test –Electroweak precision test –Dilepton resonance at the LHC –Relic abundance of electroweak KK DM Conclusions Exploring the Dark Sector 20152

3. Universal Extra Dimension model Exploring the Dark Sector 20153 KK-parity

4. Kaluza-Klein Parity Exploring the Dark Sector 20154 KK-parity

5. “Minimal” Universal Extra Dimension model Exploring the Dark Sector 20155 Tree level1-loop level [Cheng, Matchev, Schmaltz, (2002)]

6. General UED action Exploring the Dark Sector 20156 5D Bulk UED action Gauge FermionHiggsYuakawa Boundary Localized Kinetic Terms KK-parity [Flacke, Kong, Park, (2013)]

7. Example1. Split UED Exploring the Dark Sector 20157 Gauge FermionHiggsYuakawa Bulk mass term 5D Bulk UED action Fermion Lagrangian Boundary terms Universal boundary parameter [Park, Shu, (2009)] [Chen, Nojiri, Park, Shu, Takeuchi (2009)] [Kong, Park, Rizzo(2010)]

8. Example1. Split UED Exploring the Dark Sector 20158 Mass splitting between KK quarks and KK leptons gives good fit for PAMELA cosmic ray measurement. [Chen, Nojiri, Park, Shu, Takeuchi (2009)] [Kong, Park, Rizzo(2010)]

9. Example2. non-minimal UED Exploring the Dark Sector 20159 Gauge FermionHiggsYuakawa KK-parity 5D Bulk UED action Boundary terms [Flacke, Menon, Phalen (2008)] [Flacke, Menon, Sulivan (2012)]

10. Our model set up UED bulk action + BLKT of electroweak gauge sector In our analysis, we neglect the BLKTs of Higgs for simplicity. But if we turn on the Higgs BLKTs, KK Higgs can become LKP in some parameter space. We set BLKT at the electroweak scale, not at the Cut-off scale. –In MUED, there is no BLKT but one-loop contribution plays a role as boundary localized term. Exploring the Dark Sector 201510 Gauge FermionHiggsYuakawa Boundary parameters

11. Mass spectrum KK level-1 Exploring the Dark Sector 201511 The lightest mass eigenstate Heavy mass eigenstate

12. KK mixing angle Exploring the Dark Sector 201512 1 st KK mixing angle2 nd KK mixing angle

13. Effective Couplings Exploring the Dark Sector 201513

14. Phenomenology and precision test Electroweak precision test –Even numbered KK gauge boson affect the four Fermi interactions. Collider searches –2 nd KK gauge boson resonance searches. Relic density –Upper bound from DM relic abundance. Exploring the Dark Sector 201514

15. EWPT 4 Fermi operators Exploring the Dark Sector 201515

16. EWPT 4 Fermi operators Exploring the Dark Sector 201516 Overlap integral from couplings [Huang, Kong, Park (2012)] [PDG (2014)]

17. EWPT 4 Fermi operators Exploring the Dark Sector 201517

18. Collider searches Exploring the Dark Sector 201518

19. Collider searches Exploring the Dark Sector 201519

20. Collider Searches Exploring the Dark Sector 201520

21. Relic density Exploring the Dark Sector 201521 Annihilation channels

22. Relic density Exploring the Dark Sector 201522

23. Relic density Exploring the Dark Sector 201523

24. Conclusions Exploring the Dark Sector 201524

25. Exploring the Dark Sector 201525 Thank you