IIntroductiont d ti off
Non Standard Physics
Non-Standardin Neutrinos
第20回「宇宙ニュートリノ」研究会
第20回「宇宙ニトリノ」研究会
2007年2月20日
東京大学宇宙線 究
東京大学宇宙線研究所
Morimitsu TanimotoNiigatagUniversityyNeutrinos
eut osWindows to New Physics
Neutrino Oscillations provided●●Neutrino Masses
Neutrino Flavor Mixings

New SymmetryyyConnecting Physical Phenomena
Leptogenesis Lepton Flavor Violation
Leptogenesis,
Sterile Neutrino
Mass Varying Neutrino
CPT Violation ……

Alternative Solutions toNeutrino Oscillations

N t i D
NeutrinoDecays
Decoherence

However, data disfavor
Howevernon-standard
nonstandard interactioninteraction.

Neutrino Decays

Decoherence Effect
量子状態間の干渉の消失

Neutrino system to be copled to an environment“Instead of Schrodinger
Equations, we are forced to use
Liouville Equation for neutrino density matrix ρDecoherence Term

In Δm2=0 limit, the pure neutrino decoherence formula is obtained.
I dIn
d=00 lilimit,
it th
the neutrino
t ioscillation
ill tifformulal iis obtained.
bt i dNevertheless
Nevertheless,
Non-Standard Interaction may becomparable oscillation effect.
Broken of Neutral Current Universality
Flavor Changing Interactions
NuTeV Anomaly
Sterile Neutrinos
CPT Violations
Mass Varying Neutrinos

B k off NBroken
Neutralt lC
Currentt UUniversalityilit
hep-ph/0603268 M.Honda, N. Okamura and T. TakeuchiEffective Hamiltonian for Neutrino Oscillation in Matterb does not contribute to neutrino oscillations.
However,Non-StandardNon
Standard Interactions
hep-ph/0606013 N.Kitazawa, H. Sugiyama and O.Yasuda

Effective Hamiltonian for Neutrino Oscillation in Matter

εαβ have bounds at present:
S. Davidson, C. Pena-Garay, N. Rius, A. Santamaria, JHEP 0303 (2003) 011

Posibility to find the large effect of the nonnon-standard
standard interactions
in LBL oscillation experiments.

NuTeVu eV Anomaly
o ay

are smaller than expected by SM

2Differ from the NuTeV result by 3 σ in gL
heavy gauge singlet

T. Takeuchi, W. Loinaz, hep-ph/0410201
W. Loinaz, N. Okamura, T. Takeuchi, L.C.R. Wijewardhana, PRD67 (2003) 073012

CPT Violation
PhenomenologicalgMotivation comes from LSND result..
If CPT is broken in the neutrino sector, one expects differences

However, Gonzales-Garcia, Maltoni and Schwetz showed
a global fit of all data except that of LSND isin agreement with the CPT conserving solution:The situation is changed if Decoherence effect is taken.
G. Barenboim, N. Mavromatos, JHEP 0501 (2005) 034

Dynamicaly
Realization of Neutrino CPT Violation

Dark Energy Scalar : Quintessence,Quintessence Acceleron
However, the laboratory experimental limit
on CPT Violation
Vi l ti
iin electrons
l tiis so stringent.
t it

P-H. Gu, X-J. Bi and X. Zhang, hep-ph/0511027

St il N
SterileNeutrinost i
St il NSterile
Neutrinot i
M
Mass andd Acti
Active-Sterile
St il neutrino
t i
mixingi iThree Benchmarks

A YA.
Yu. S
Smirnov,i
R
R.Z.
Z F
Funchal,h l h
hep-ph/0603009
h/0603009

Mass Varying Neutrinos
R.Fardon, A.E.Nelson, N.Weiner, Astropart.Phys.10(2004)005
PGu X-L.Wang
P.Gu,
X-L Wang and X-Min.Zhang,
X-Min Zhang PRD68(2003)087301

Motivations
Mo
iva ions
Very little is known about the cosmological behavior
off neutrinos
t iandd ththe neutrinot i energy ddensity.
itThe energy scale of the dark energy is close tothe neutrino mass scale:20
20

MaVaNs Scenario

Assumption 1: mν is the function of φa (Acceleron).

Assumption 2: ρDE has two components.
Stationarity ofρDE leads to the varying neutrino mass.
massnν

Non-rela neutrinos〉⎨=mm⎨n⎨

21
21

Neutrino Oscillations as a Probe of Dark Energy
D.B. Kaplan, A.E. Nelson, N. Weiner, PRL 93(2004) 091801

Solar mass-varying
mass varying neutrino oscillation
V.Barger, P. Huber, D. Marfatis, PRL 95(2005) 211802

Mass varing neutrinos in the sun
M. Cirelli, M.C. Gonzalez-Garcia,Gonzalez Garcia, C. Pena-Garay,
Pena Garay, NPB719(2005) 219

Confronting mass-varing neutrinos with MiniBooNE
V. Barger, D. Marfatia, K. Whisnant, PRD73 (2006) 013005

Testing mass-varing
mass varing neutrinos with reactor experiments
T. Schwetz, W. Winter, PL B633(2006) 557
Effects of environment dependence of neutrino mass versus
solarsoa aandd reactor
eac o neutrinoeuo dadataaM.C. Gonzalez-Garcia, P.C. Hondara, R.Z. Funchal, PRD73(2006)033008

=1eV

ChallengeChlltto observeb
the nonnon-stanadrd
stanadrd physics
in future Neutrino
Oscillation Experiments !