2. 1/17 Hiroaki SUGIYAMA (Univ. of Toyama, Japan) Contents Introduction Our Model - extended HTM - LHC Phenomenology Summary Higgs Triplet Model Motivations based on ‘S. Kanemura, HS, arXiv:1202.5231’

3. 2/17 Neutrino masses are very different from other fermion masses. neutrino-specific mechanism to generate their masses ? Neutrino-specific mass term Majorana mass : (possible only for ) Only the SM Higgs boson has vev. Extra Higgs bosons have vev. etc. to be compensated by scalar fields etc. Introduction

4. 3/17 Higgs Triplet Model the SM + a complex Higgs triplet of Majorana mass matrix Neutrino Mass Yukawa tem Soft breaking of W. Konetschny and W. Kumer, PLB70, 433 (1977) M. Magg and C. Wetterich, PLB94, 61 (1980) T.P. Cheng and L.F. Li, PRD22, 2860 (1980) J. Schechter and J.W.F. Valle, PRD22, 2227 (1980)

5. 4/17 Higgs potential no NG-boson for : spontaneous breaking of : explicit breaking of (“Majoron”) Yukawa interaction with a complex Higgs triplet Majorana mass matrix

6. 5/17 Small option seems charming Light new particles (ex. ) Sizable new coupling constants (ex. ) production at LHC sizable LFV We want to suppress Motivations なるほど

7. 6/17 We want to supply the dark matter to the HTM ほうほう

8. 7/17 Suppression of parameter Supplying DM candidate Resolve these issues at once Surprising model (some relation between them) “Idea is what resolves multiple issues at once” - Shigeru Miyamoto - Our model

9. 8/17 Hiroaki SUGIYAMA (Univ. of Toyama, Japan) Contents Introduction Our Model - extended HTM - LHC Phenomenology Summary Higgs Triplet Model Motivations based on ‘S. Kanemura, HS, arXiv:1202.5231’

10. 9/17 Our Model Suppression of parameter by conservation at the tree level Only scalar sector SM HTM : forbidden : allowed : at the loop level is extended. broken by おっ S. Kanemura, HS, arXiv:1202.5231

11. 10/17 Our Model is DM candidate odd particles Only scalar sector SM HTM is extended. ほほぅ

12. 11/17 1-loop generation of parameter by utilizing DM candidate (Dark matter candidates) contribute to the loop -odd particles “ オリゼー ダイアグラム ” なかまだー

13. 12/17 Estimation of Suppression of Case of (inert doublet DM) Case of (inert singlet DM) satisfy LEP-II and WMAP E. Lundstrom et al., PRD79, 035013 (2009) Example: DM おっ いいじゃん

14. 13/17 Hiroaki SUGIYAMA (Univ. of Toyama, Japan) Contents Introduction Our Model - extended HTM - LHC Phenomenology Summary Higgs Triplet Model Motivations based on ‘S. Kanemura, HS, arXiv:1202.5231’

15. 14/17 : The most interesting decay because of Good for BG reduction by imposing Negligible No Hopeful Probe of at the LHC : (See also, S. Kanemura and K. Yagyu, PRD85, 115009 ) やるなー わー

16. 15/17 Hopeful Probe of at the LHC : with Negligible contribution from For example, Negligible かもすか わー とりあえず

17. 16/17 c.f. usual HTM for the case of Additional leptons likely to exist. Hopeful Probe of at the LHC : まかせろ わー かもすぞー

18. 17/17 Summary The Higgs Triplet Model is extended. Dark matter candidate one-loop A strong suppression of parameter is possible. For example, suppressed (composed of and ) “one-loop” (not small) would be probed at the LHC with

19. 18/17 Backup

20. 19/17 Yukawa interaction with a complex Higgs triplet Higgs Triplet Model Higgs potential

21. 20/17 Scalar Potential

22. 21/17 Masses of -Odd Scalars

23. 22/17 Masses of -Even Scalars

24. 23/17 E. Lundstrom et al., PRD79, 035013 (2009) Constraint on Inert Doublet Scalar DM