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Neutrino Masses and Lepton Flavor Physics

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Large Neutrino Mixing with Lopsided Mass Matrices. Quark and Lepton ... Large Neutrino Mixing can arise from Unified theories through lopsided mass matrices. ... – PowerPoint PPT presentation

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Title: Neutrino Masses and Lepton Flavor Physics


1
Neutrino Masses and Lepton Flavor Physics
  • K.S. Babu
  • Department of Physics, Oklahoma State University

PHENO 03 Madison, Wisconsin, May 5, 2003
2
Outline
  • Neutrino Oscillation Results
  • Interpreting Data
  • Patterns of Neutrino Mass Spectrum
  • Neutrinoless Double Beta Decay (bb)0n Tests
  • Theoretical Modeling
  • Large Neutrino Mixing
  • Unified Quark-Lepton Description
  • Lepton Flavor Violation
  • Rare Decays t?mg, m?eg
  • Lepton Dipole Moments
  • Conclusions

3
Solar Neutrino Oscillations
Gonzalez-Garcia et al. (2003)
4
Atmosphere Neutrino Oscillations
Maltoni, et al. hep-ph/0207227
5
LSND
Aguilar, et. al hep-exp/0104049
6
Patterns of Neutrino Mass Spectrum
7
Neutrino Mixing versus Quark Mixing
Leptons
Quarks
Disparity a challenge for Quark-Lepton unified
theories.
8
(bb)0n and Pattern of Neutrino Masses
9
(meV)
Pascoli, Petcov, Rodejohann, hep-ph/0212113
10
Neutrino Masses and the Scale of New Physics
Very Close to the GUT scale.
11
Gauge Coupling Unification in MSSM
12
Structure of Matter Multiplets
13
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14
Large Neutrino Mixing with Lopsided Mass Matrices
Quark and Lepton Mass hierarchy
This motivates
KSB and S. Barr, 1995
15
Example of Lopsided Mass Matrices
Gogoladze, Wang, KSB, 2003
Discrete ZN Gauge Symmetry
16
Lopsided Mass Matrix Model in SO(10)
S.Barr and KSB,2002
PREDICTIONS
10 Parameters vs. 20 Observables
17
FIT
Buras, et al
Georgi-Jarlskog
18
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19
Neutrino Mass Textures
Fukugita, Tanimoto, Yanagida, 2003
20
A4 Symmetry and Quasi-degenerate Neutrino
E. Ma, 2002 E. Ma, J. Valle, KSB, 2002
With Arbitrary Soft A4 Breaking
With Complex parameters, arg(Ue3) p/2
21
Electric Dipole Moments
Violates CP
Electron
Neutron
Phases in SUSY breaking sector contribute to EDM.
22
SUSY Contributions
A, B are complex in MSSM
Effective SUSY Phase
23
If parity is realized asymptotically, EDM will
arise only through non-hermiticity induced by RGE.
Subject to experimental tests
Dutta, Mohapatra, KB (2001)
24
Lepton Flavor Violation and Neutrino Mass
  • Seesaw mechanism naturally explains small n-mass.

Current neutrino-oscillation data suggests
Flavor change in neutrino-sector
Flavor change in charged leptons
In standard model with Seesaw, leptonic flavor
changing is very tiny.
25
In Supersymmetric Standard model
For
nR active
flavor violation in neutrino sector Transmitted
to Sleptons
Borzumati, Masiero (1986) Hall, Kostelecky, Raby
(1986) Hisano, et al (1995)
SUSY Seesaw Mechanism
If B-L is gauged, MR must arise through Yukawa
couplings.
Flavor violation may reside entirely in f or
entirely in Yn
26
If flavor violation occurs only in Dirac Yukawa
Yn (with mSUGRA)
If flavor violation occurs only in f (Majorana
LFV)
LFV in the two scenarios are comparable. More
detailed study is needed.
27
Neutrino Fit
For Majorana LFV scenario, take
Dutta, Mohapatra, KB 2002
28
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29
For Dirac LFV scenario
Same neutrino oscillation parameters as in
Majorona LFV
The two scenarios differ in predictions for
30
Dirac LFV
F. Deppisch, et al, hep-ph/0206122
31
Majorana LFV
Dutta, Mohapatra, KB (2002)
32
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33
Correlation between LFV and B?fKs
Hisano and Shimizu, hep-ph/0303071
34
LFV in SUSY SO(10)
Masiero, Vempati and Vives, hep-ph/0209303
35
Conclusions
  • Neutrino Experiments pinning down oscillation
    parameters.
  • Neutrinoless double beta decay can discriminate
    between various mass patterns.
  • Large Neutrino Mixing can arise from Unified
    theories through lopsided mass matrices.
  • Lepton Flavor Violation t?mg, m?eg, and EDMs
    within reach of experiments.
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