1/11

Hiroaki SUGIYAMA(Univ. of Toyama, Japan)

based on ‘S. Kanemura, HS, arXiv:1202.5231’

2/11

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)

3/11

Small option seems charming

Light new particles (ex. )

Sizable new coupling constants (ex. )

production at LHC

sizable LFV

We want to suppress

Motivations

4/11

We want to supply the dark matter to the HTM

5/11

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

6/11Our Model

Suppression of parameter

by conservation at the tree level

Only scalar sectorSM

HTM

: forbidden

: allowed

: at the loop level

is extended.

broken by

S. Kanemura, HS, arXiv:1202.5231

7/11

Y. Chikashige, R.N. Mohapatra, and R.D. Peccei., PLB98, 265 (1981)

c.f. Constraint from cooling of white dwarfs :

Singlet Majoron Interaction to Matter

8/11Our Model

is DM candidate

odd particles

Only scalar sectorSM

HTMis extended.

9/111-loop generation of parameter by utilizing DM candidate

(Dark matter candidates)contribute to the loop

-odd particles

“A. oryzae diagram” Moyashimon

10/11Estimation of Suppression of

Case of (inert doublet DM)

Case of (inert singlet DM)

satisfy LEP-II and WMAPE. Lundstrom et al., PRD79, 035013 (2009)

Example:

Example:

DM

11/11Summary

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”

12/11

Backup

13/11

Yukawa interaction with a complex Higgs triplet

Higgs Triplet Model

Higgs potential

14/11Scalar Potential in Our Model

15/11Masses of -Odd Scalars

16/11Masses of -Even Scalars

17/11Vacuum Expectation Values

18/11

E. Lundstrom et al., PRD79, 035013 (2009)

Constraint on Inert Doublet Scalar DM

19/11

: The most interesting decay because of

Good for BG reduction by imposing

Negligible

No

No

Hopeful Probe of at the LHC :

(See also, S. Kanemura and K. Yagyu, PRD85, 115009 )

20/11Hopeful Probe of at the LHC :

with

Negligible contribution from

For example, Negligible

21/11

c.f. usual HTM for the case of

Additional leptons likely to exist.

Hopeful Probe of at the LHC :