1/17 Hiroaki SUGIYAMA (Univ. of Toyama, Japan) Contents Introduction Our Model - extended HTM - LHC...

1/17

Hiroaki SUGIYAMA(Univ. of Toyama, Japan)

Contents Introduction

Our Model - extended HTM - LHC Phenomenology Summary

Higgs Triplet ModelMotivations

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

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 compensatedby scalar fields

etc.

Introduction

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)

4/17Higgs potential

no NG-boson for

: spontaneous breaking of

: explicit breaking of (“Majoron”)

Yukawa interaction with a complex Higgs triplet

Majorana mass matrix

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

6/17

We want to supply the dark matter to the HTMほう

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

8/17

Hiroaki SUGIYAMA(Univ. of Toyama, Japan)

Contents Introduction

Our Model - extended HTM - LHC Phenomenology Summary

Higgs Triplet ModelMotivations

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

9/17Our Model

Suppression of parameter

by conservation at the tree level

Only scalar sectorSM

HTM

: forbidden

: allowed

: at the loop level

is extended.

broken by

おっ

S. Kanemura, HS, arXiv:1202.5231

10/17Our Model

is DM candidate

odd particles

Only scalar sectorSM

HTMis extended.

ほほぅ

11/171-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

12/17Estimation 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

おっ

いいじゃん

13/17

Hiroaki SUGIYAMA(Univ. of Toyama, Japan)

Contents Introduction

Our Model - extended HTM - LHC Phenomenology Summary

Higgs Triplet ModelMotivations

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

14/17

: 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 )

やるなーわー

15/17Hopeful Probe of at the LHC :

with

Negligible contribution from

For example, Negligible

かもすか

わーとりあえず

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

17/17Summary

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 probedat the LHC

with

18/17

Backup

19/17

Yukawa interaction with a complex Higgs triplet

Higgs Triplet Model

Higgs potential

20/17Scalar Potential

21/17Masses of -Odd Scalars

22/17Masses of -Even Scalars

23/17

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

Constraint on Inert Doublet Scalar DM