Neutrino Mass
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Neutrino Mass. in TeV-Scale New Physics Models. Hiroaki SUGIYAMA. (Univ. of Toyama, Japan). Introduction. Neutrino masses are extremely smaller than other fermion masses. Naïve : Tree-level neutrino mass with SM Higgs VEV. Particles :. No extension of scalar sector. Interactions :.

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Hiroaki SUGIYAMA

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Hiroaki sugiyama

Neutrino Mass

in TeV-Scale New Physics Models

Hiroaki SUGIYAMA

(Univ. of Toyama, Japan)


Hiroaki sugiyama

Introduction

Neutrino massesare extremely smaller than other fermion masses.

Naïve : Tree-level neutrino mass with SM Higgs VEV

Particles :

No extension of scalar sector

Interactions :

Dirac neutrino mass :

Unnatural ?

Other mechanism ? (Seesaw etc.)

Generated at loop-level ?

S. Nasri and S. Moussa, MPLA17, 771 (2002)

S. Kanemura, T. Nabeshima, HS, PLB703, 66 (2011)

Extended scalar sector


Hiroaki sugiyama

Seesaw : Tree-level neutrino mass with SM Higgs VEV

Particles :

No extension of scalar sector

Interactions :

Majorana neutrino mass :

P. Minkowski, PLB67, 421 (1977)

T. Yanagida, KEK-79-18, p.95 (1979)

M. Gell-Mann, et al., in Supergravity (1979)

Far from experimental reach

Why light ?

Low-scale cut-off ?

(Extra Dim., Strong Dynamics, etc.)

Generated at loop-level ?

Extended scalar sector

S. Kanemura, T. Nabeshima, HS, PRD85, 033004 (2012)


Hiroaki sugiyama

New scalars which couple only with leptons (“leptophilic”)

Lepton – Lepton – New scalar : predictive

Lepton – New Fermion – New scalar : free

TeV scale

Production & decay @ collider experiments

Flavor structure of leptonic decay via the Yukawa

Measurements

Predictions

Parameters unrelated to oscillation

The lightest mass eigenvalue

Majorana CP-violating phases

Oscillation data

Origin of neutrino mass

Lepton flavor mixing structure


Hiroaki sugiyama

Yukawa Interactions with Leptophilic Scalars

singlet

: Singly charged

(e.g., in Zee model)

: Doubly charged

(e.g., in Zee-Babu model)

Loop-level Majorana mass

with SM Higgs VEV

doublet

: Neutrinophilic doublet

Dirac neutrinos

Tree-level mass

triplet

with new VEV

(e,g., in Higgs Triplet Model)

Majorana neutrinos


Hiroaki sugiyama

Doubly charged

Singly charged

Neutral

singlet

iv )

ii )

iii )

doublet

triplet

iii )

i )


Hiroaki sugiyama

Doubly Charged Scalar

Doubly charged

Singly charged

Neutral

singlet

iv )

ii )

iii )

doublet

triplet

iii )

i )


Hiroaki sugiyama

Doubly Charged Higgs - Triplet -

Higgs Triplet Model (or HTM-like ones)

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)

Symmetric

Yukawa :

Majorana neutrino mass :

Loop suppression ?

S. Kanemura, HS, PRD86, 073006 (2012)


Hiroaki sugiyama

Information on Non-Zero

(the lightest neutrino mass)

Observation in shaded region

Impossible with

Possible with

A.G. Akeroyd, M. Aoki, HS, PRD77,075010

See also J. Garayoa, T. Schwetz, JHEP0803,009

M. Kadastki, M. Raidal, L. Rebane, PRD77, 115023


Hiroaki sugiyama

Doubly Charged Scalar - Singlet -

Zee-Babu Model

A. Zee, NPB264, 99 (1986)

K.S. Babu, PLB203, 132 (1988)

Yukawa :

Symmetric

Antisymmetric

Majorana neutrino mass :


Hiroaki sugiyama

Prediction for neutrino mass matrix

or

“Prediction” for leptonic decay

(assumption)

Negligible contribution of to

K.S. Babu and C. Macesanu, PRD67, 073010 (2003)

D. Aristizabal Sierra and M. Hirsch, JHEP0612, 052 (2006)

M. Nebot et al., PRD77, 093013 (2008)

Measurement :

?

or


Hiroaki sugiyama

Singly Charged Scalar

Doubly charged

Singly charged

Neutral

singlet

iv )

ii )

iii )

doublet

triplet

iii )

i )


Hiroaki sugiyama

Singly Charged Higgs - Doublet or Triplet -

Neutrinophillic Doublet

F. Wang. W. Wang, J.M. Jang, Europhys. Lett. 76, 388 (2006)

S. Gabriel and S. Nandi, PLB655, 141 (2007)

S.M. Davidson and H.E. Logan, PRD80, 905008 (2009)

Only for neutrinos

Yukawa :

: odd

Dirac neutrino mass :

cf.

Loop suppression ?

S. Kanemura, T. Matsui, SH, work in progress


Hiroaki sugiyama

S.M. Davidson and H.E. Logan, PRD80, 905008 (2009)

Measurement :


Hiroaki sugiyama

The same for triplet

P. Fileviez Perez et al., PRD78, 015018 (2008)


Hiroaki sugiyama

Singly Charged Scalar - Singlet 1 -

The simplest Zee Model

A. Zee, PLB93, 389 (1980)

L. Wolfenstein, NPB175, 93 (1980)

No Flavor-Changing-Neutral-Current

Yukawa :

Antisymmetric

Majorana neutrino mass :

Excluded by Oscillation data

e.g., X.G. He, EPJC34, 371 (2004)


Hiroaki sugiyama

General (Original) Zee Model

A. Zee, PLB93, 389 (1980)

Antisymmetric

Yukawa :

Incl. FCNC

Majorana neutrino mass :


Hiroaki sugiyama

“Prediction” for neutrino mass matrix

(assumption)

Negligible contributions of and to

or

“Prediction”

(Majorana phase)

Daya Bay :

Measurement :

?

See also X.G. He, S.K. Majee, JHEP1203, 023 (2012)


Hiroaki sugiyama

Singly Charged Scalar - Singlet 2 -

Yukawa :

Antisymmetric

Majorana neutrino mass :

Dirac neutrino mass :

Example : Zee-Babu model

Example : 1-loop model

A. Zee, NPB264, 99 (1986)

S. Nasri and S. Moussa, MPLA17, 771 (2002)

K.S. Babu, PLB203, 132 (1988)

S. Kanemura, T. Nabeshima, HS, PLB703, 66 (2011)


Hiroaki sugiyama

Prediction for neutrino mass matrix

or

Prediction for leptonic decay

Measurement :

K.S. Babu and C. Macesanu, PRD67, 073010 (2003)

D. Aristizabal Sierra and M. Hirsch, JHEP0612, 052 (2006)

M. Nebot et al., PRD77, 093013 (2008)

S. Kanemura, T. Nabeshima, HS, PLB703, 66 (2011)


Hiroaki sugiyama

Summary

TeV-scale new scalars which couple only with leptons

(others ?)

Flavor structure of leptonic decay via the Yukawa

Measurements

Predictions

Parameters unrelated to oscillation

The lightest mass eigenvalue

Majorana CP-violating phases

Oscillation data

Origin of neutrino mass

? Different VEV ?

Tree ? Loop ?

Dirac ? Majorana ?

Flavored Higgs ?

Flavor structure of mass matrix

(Flavor Symmetry)


Hiroaki sugiyama

backup


Hiroaki sugiyama

Summary of My Hope - 1

triplet :

or not

or not

Doubly charged :

or not

or

Singly charged :

or not

doublet :


Hiroaki sugiyama

Summary of My Hope - 2

singly charged singlet :

or

(Majorana)

(Dirac)

doubly charged singlet :

Zee-Babu model ??


Hiroaki sugiyama

in the HTM

A.G. Akeroyd, S. Moretti, PRD86, 035015 (2012)


Hiroaki sugiyama

in the THDMs

P.M. Ferreira, R. Santos, M. Sher, J.P. Silva, PRD85, 077703 (2012)


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