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Dark Matter and a Suppression Mechanism for Neutrino Masses in the Higgs Triplet Model. Hiroaki SUGIYAMA. (Univ. of Toyama, Japan). based on ‘S. Kanemura, HS, arXiv:1202.5231 ’. Higgs Triplet Model. the SM + a complex Higgs triplet of. W. Konetschny and W. Kumer, PLB 70 , 433 (1977).

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Dark Matter

and a Suppression Mechanism

for Neutrino Masses

in the Higgs Triplet Model

Hiroaki SUGIYAMA

(Univ. of Toyama, Japan)

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


Higgs Triplet Model

the SM + a complex Higgs triplet 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)

Neutrino Mass

Majorana mass matrix

Soft breaking of

Yukawa tem


Motivations

Small option seems charming

Light new particles (ex. )

production at LHC

Sizable new coupling constants (ex. )

sizable LFV

We want to suppress



Our model

Suppression of parameter

Surprising model

Resolve these issues at once

(some relation between them)

Supplying DM candidate

“Idea is what resolves multiple issues at once”

- Shigeru Miyamoto -


Our Model

S. Kanemura, HS, arXiv:1202.5231

HTM

Only scalar sector

is extended.

SM

broken by

Suppression of parameter

: allowed

by conservation at the tree level

: forbidden

: at the loop level


Singlet Majoron Interaction to Matter

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

c.f. Constraint from cooling of white dwarfs :


Our Model

HTM

Only scalar sector

is extended.

SM

odd particles

isDM candidate


1-loop generation of parameter by utilizing DM candidate

-odd particles

(Dark mattercandidates)

contribute to the loop

Moyashimon

“A. oryzae diagram”


Estimation of Suppression of

Case of (inert doublet DM)

DM

Example:

satisfy LEP-II and WMAP

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

Case of (inert singlet DM)

Example:


Summary

The Higgs Triplet Model is extended.

Dark mattercandidate

(composed of and )

one-loop

“one-loop”

A strong suppression of parameter is possible.

For example,

suppressed



Higgs Triplet Model

Yukawa interaction with a complex Higgs triplet

Higgs potential






Constraint on Inert Doublet Scalar DM

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


Hopeful Probe of at the LHC :

: The most interesting decay

because of

Good for BG reduction by imposing

Negligible

No

No

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


Hopeful Probe of at the LHC :

with

Negligible contribution from

Negligible

For example,


Hopeful Probe of at the LHC :

c.f. usual HTM for the case of

Additional leptons likely to exist.


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