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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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slide1

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’

slide2

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

slide3

Motivations

Small option seems charming

Light new particles (ex. )

production at LHC

Sizable new coupling constants (ex. )

sizable LFV

We want to suppress

slide5

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 -

slide6

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

slide7

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 :

slide8

Our Model

HTM

Only scalar sector

is extended.

SM

odd particles

isDM candidate

slide9

1-loop generation of parameter by utilizing DM candidate

-odd particles

(Dark mattercandidates)

contribute to the loop

Moyashimon

“A. oryzae diagram”

slide10

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:

slide11

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

slide13

Higgs Triplet Model

Yukawa interaction with a complex Higgs triplet

Higgs potential

slide18

Constraint on Inert Doublet Scalar DM

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

slide19

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 )

slide20

Hopeful Probe of at the LHC :

with

Negligible contribution from

Negligible

For example,

slide21

Hopeful Probe of at the LHC :

c.f. usual HTM for the case of

Additional leptons likely to exist.