a. yu. smirnov
DESCRIPTION
Sterile neutrinos:. searches & implications. A. Yu. Smirnov. International Centre for Theoretical Physics, Trieste, Italy. Planck 2011, May29, Lisbon. Sterile neutrino. n s. Light. No weak interactions: - singlets of the SM symmetry group. RH - components of neutrinos. - PowerPoint PPT PresentationTRANSCRIPT
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A. Yu. Smirnov
International Centre for Theoretical Physics, Trieste, Italy
Planck 2011, May29, Lisbon
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Mix with active neutrinos
s
Couple with usual neutrinos via (Dirak) mass terms
No weak interactions:- singlets of the SM symmetry group
Light
RH - components
of neutrinos
may have Majoranamass termsmaximal mixing?in the context of idea of neutrino–antineutrino oscillations
Sov. Phys. JETP 26 984 (1968)
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e
Large Scintillator Neutrino Detector
Los Alamos Meson Physics Facility
e+
e + p e+ + n
Cherenkov cone + scintillations
p
e+ + e +
e
t
Oscillations?
P = (2.64 +/- 0.67 +/- 0.45) 10-3
L = 30 m
n
decay at rest
m2 > 0.2 eV2
200 t mineral oil scintillator
3.8excess
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Sterile neutrinos as solution of all the problems
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450 t (mineral oil) 1280 PMT12 m diameter tank
L = 541 m, <E> ~ 800 MeV
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G.Mention et al, arXiv: 1101.2755
Increase of the Mean flux by 3%
m2 > 1.5 eV2
sin2 2 = 0.17 +/- 0.1
Revised value of cross-section
Rreact = 0.937 +/- 0.027
2.14
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Source + reactor
G.Mention et al, arXiv: 1101.2755
RGa = 0.87 +/- 0.05
Gallex/GNO 51CrSAGE 51 Cr, 37Ar
Calibration
C Giunti, M. Lavedersin22 = 0.24
m2 = 2.15 eV2
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With reactor anomaly global fit of data in terms of nu-sterile becomes better
Limit on Ue4 becomes weaker
|Ue4|2 : 0.02 0.04
Smaller values of U4 are allowed to explain LSND/MiniBooNE –less tension with SBL experiment bounds
|U4|2 : 0.04 0.02
J Kopp, M. Maltoni,T.Schwetz1103.4570 [hep-ph]
3 + 2scheme
m412 = 0.47
eV2Ue4 = 0.128 Ue5 = 0.138
U4 = 0.165 U5 = 0.148
m512 = 0.87
eV2
45
Controversial and not convincing
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Neff = 4.34 (68 % CL) + 0.86- 0.88
- WMAP-7- Barion Acoustic Oscillations- Hubble constant
Neff = 5.3 +/- 1.3 (68% CL) - WMAP–7 - Atacama Cosmology Telescope
Neff = (0.02 – 2.2) (68% CL)
Effective number of neutrino species
BBN
Neff = 3.68 (68 % CL) + 0.80- 0.70
E. Komatsu et alarXiv: 1001.4538 [astro-ph.CO]
J. Dunkley et alarXiv:1009.0866[astro-ph.CO]
J. Hamann et alPRL 105 (2010)181301
Y. I. Izotov and T X Thuan Astrophys J 710 (2010) L67
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E Giusarma et al 1102.4774 [astro-ph]
run 1 (blue)
95%68 %
m2 < 0.25 eV2
run 2 (red)
- WMAP- SDSS (red galaxy clustering)- Hubble (prior on H0 )
- Supernova Ia Union Compilation 2 (in add)
+ BBN
Inverse approach:
J R Kristiansen, O Elgaroy 1104.0704 [astro-ph]
wCDM + 2S
1). w < -1
2). Age of the Universe 12.58 +/- 0.26 Gyr
too young?
The oldest globular clusters 13.4 +/- 0.8 +/- 0.6 Gyr
ruling out
CDM
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(2 – 4) 10-3 eV
0.5 - 2 eV
~ 10 keV
40 - 70 MeV - LSND, MiniBooNE
- Warm Dark matter- Pulsar kick
- Solar neutrinos- Extra radiation in the Universe
- LSND, MiniBooNE- Reactor anomaly- Calibration experiments- Extra radiation
s
1 eV
1 keV
1 MeV
10-3 eV
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mee me me … m m … … m For mSS ~ 1 eV
For mSS ~ 1 eV
Mass matrix
Mass matrix
e
e
meS mS mS
mSS … … …
SS
tanjS = mjS/mSS
mSS >> mab , maS mSS >> mab , maS
~ 0.2 - is not small
produces large corrections to the active neutrino mass matrix
In general can not be considered as small perturbation!
mij ~ - taniStanjS mSS ~ 0.04 mSS
Active neutrino spectrum is quasi degenerate
meS mS mS have certain symmetry
Effect can be small if
mSS ~ mab mSS ~ mab
J. Barry, W. Rodejohann,He ZhangarXiv: 1105.3911
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m = ma + m
produce dominant - block
with small determinant
Original active mass matrix e.g. from see-saw
Original active mass matrix e.g. from see-saw
m can change structure (symmetries) of the original mass matrix completely (not a perturbation)
m can change structure (symmetries) of the original mass matrix completely (not a perturbation)
Induced mass matrix due to mixing with nu sterile
Induced mass matrix due to mixing with nu sterile
Enhance lepton mixing
Generate TBM mixing
UPMNS
Be origin of difference of
VCKMand
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P. C. de Holanda, A. Yu. S. 1012.5627 [hep-ph]
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P. de Holanda, A.S. Phys. Rev. D69 (2004) 113002 hep-ph 0307266
QArexp < QAr
LMA
2.55 +/- 0.25 SNU > 3.1 SNU
No turn up of the spectrum in SK
Light sterile neutrino R= m012 / m21
2 << 1
- mixing angle of sterile- active neutrinos
dip in survival probability
Motivation for the low energy solar neutrino experiments BOREXINO, KamLAND …
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pp 7Be CNO 8B
gap
e- survival probability from solar neutrino data vs LMA-MSW solution
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e
2
1
0
mas
s m2atm
m2sun
3
m2dip
s
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s
2m
1m
0m sterile resonances
He
density
m012 > (0.2 - 2) 10-5 eV
2
sin2 2 = 10-4 - 10-3
non-adiabatic level crossing
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se
a
0
1
2
U = U U
U - rotation in 01- plane on
U - rotation in 12-plane on s mixes in
0and1
ee
2 2m
1m
0m
1
0
Scheme of transitions
P(e e) ~ |Ue1m
A11 + Ue0mA01|2 |Ue1 |2 + |Ue2
m|2|Ue2|2
s
interference wiggles
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- dip- wiggles
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sin22= 10-3 (red), 5 10-3 (blue)
SK-I
SK-III
SNO-LETA
R = 0.2
m2 = 1.5 10-5 eV2
SNO-LETA
Borexino
P. De Holanda, A.S.
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dataexcluded
pepBe
pep-suppressed
R = 0.007 - 0.07
excluded
m012 > 0.5 10-5
eV2
Predictions for pep-neutrinos
R = 0.07 - 0.115
P(pep) = 0.2 – 0.3
P(Be) = 0.55
R > 0.12 P(pep) = 0.53
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2 fit of spectra with sterile neutrino dip:SK-I, SK-III, SNO-LETA, SNO-NC, Borexino
Best fit values: m012 ~ 1.5 10-5 eV2 sin2 2 ~ 10-3 2 = 7.5
m012 = (1 – 2) 10-5 eV2sin22 ~ (0.5 – 1) 10-3
2 > 6
m0 > 0.003 eV
Alternative: mixing with level 2m
R= m012 / m21
2 = 1.1
sin22 ~ (0.5 – 1) 10-3
Interval with
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sin2 2 ~ 10-3
m0 ~ 0.003 eV M2 MPlanck
m0 = M ~ 2 - 3 TeV
mixing
h vEW M ~
sin2 2 ~ 10-1 vEW M
~
h = 0.1
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P. De Holanda, A.S.
Mixing with the third active state
s
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Production of sterile in the Early universe
’ = cos23 + sin23
3 = cos ’ + sins
Atmospheric neutrinos:
sin2 < 0.2 – 0.3 (90%)
MINOS:
sin2 < 0.23 (90%)
m302 ~ 2.5 10-3 eV2
M Cirelli G Marandella A Strumia F Vissani
tan2
Mixing of s in 3
where
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’ – s resonance ER ~ 12 GeV
s resonance peak 10 – 15 GeV
IceCube Deep Core
Additional suppression of e flux
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S Razzaque and A. S.arXiv:1104.1390 [hep-ph]
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H Nunokawa O L G PeresR Zukanovich-FunchalPhys. Lett B562 (2003) 279
- s oscillations with m2 ~ 1 eV2 are enhanced in matter of the Earth in energy range 0.5 – few TeV
This distorts the energy spectrum and zenith angle distribution of the atmospheric muon neutrinos, also modifies /e ratio
Can be tested by IceCube
First data from IceCube
- Check theoretical considerations, generalize … - perform analysis of the data
S Choubey JHEP 0712 (2007) 014
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Unfolded neutrino spectrum
Zenith angle distribution
R. Abbasi et al, arXiv:1010.3980 [astro-ph.CO]
April 2008 – May 200940 strings100 GeV – 400 TeV18 000 up-going muons
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e
2
1
4
mas
s
m2atm
m2sun
3
m2LSND
s
P ~ 4|Ue4 |2|U4 |2
Restricted by short baseline experiments CHOOZ, CDHS, NOMAD
LSND/MiniBooNE: vacuum oscillations
With new reactor data:
m412 = 1.78
eV2Ue4 = 0.15
U4 = 0.23
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Normal mass hierarchy in the flavor block; m0 ~ 1 eV
|Ue4 |2 |U|2
are large enough, so that evel crossings are adiabatic
Three new level crossings
Ve - Vs = 2 GF (ne – nn /2)
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= cos23 + sin23
0 = - sin + coss
3 = cos + sins
= cos23 - sin23 2 = ~
~
~
~
~
s mixes with ~
Uf = U23 U
Propagation basis: s, ,2~ ~
S
s mixes in the mass states and 0
Evolution is reduced to 2-problem exactly
s
where
0
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s s
fU23
s
s
S
~
Propagation basis~
~
~
~
projection projectionpropagation
P( ) = |cos223A22 + sin223A33 |2
A22
A33
decouples
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antineutrinos
MSW resonance dip
neutrinos
Effect of phase shift for the
oscillations
due to matter effects
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Eth = 0.1 TeV
S = N(osc.)/N(no osc.)
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S - mass mixing case
Free normalization and tilt factor
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sin2 > 0.04 LSND: + 5% uncorrelated systematic errors
Statistical errors + free normalization + tilt
Illustrative fit in the simplestmixing scheme
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0 = - sin + coss
3 = - cossin23 + cos 23 - sinsin23s
Uf = U U23
Propagation basis = flavor basis
s mixes with
s
0
s-
2 = - sincos23 + sin 23 - coscos23s
Evolution is not reduced to the 2 - evolution exactly
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neutrinosantineutrinos
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Free normalization and tilt factor
S - mixing
Fit with sterile is even better
Eth = 0.1 TeV
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Eth =
0.1
TeV
Eth =
1 T
eV
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Light sterile neutrino mixed in 1 or/and 2 with
m012 ~ 1.5 10-5
eV2sin2 2 ~ 10-3
leads to the dip in the spectrum which explains an absence of the up turn of the spectrum, reduces prediction for the Ar production rate
Being mixed in 3 with sin2 ~ 0.2 sterile can be generated in the Early Universe Neff ~ 1, thus explaining additional radiation
New evidences/hints of existence of sterile: MiniBooNE, reactors,
Gallium calibration, solar, additional radiation in the Universe
Convincing? Consistent? Controversial?
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Depending on values of parameters, U4, U, m422
large variety of zenith angle distribution can be obtained.
With present data only part of the parameter space relevant for LSND/MiniBooNE can be excluded and in some ranges the fit can be even improved.
Future high statistics studies of the zenith angle distributions
in different energy regions (with different energy thresholds)
can provide sensitive search of sterile in whole parameter space
and discriminate different mixing scenarios.
IceCube has high sensitivity to sterile mixing with
m012 ~ 1 eV2
sin2 > 0.01
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E = 200 MeV E = 475 MeV
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In the lowest order at high energies P( ) ~ | sin2 ’ A33() + cos2 ’|2
V0T = ( US0 , U0 , U0 )
In general, the Hamiltonian H = 0 V0 x V0
T + 2 V2 x V2T
i = mi32 / 2E Vi
T = ( USi , Ui , Ui ), (i = 0, 2)
H ~ 0 V0 x V0T
tan ’ = - U0 / U0 sin2 = |U0|2 + | U0|2
|U0|2 ~ 0.02 – 0.04
|U0|2 < 0.5 MINOS, Atmospheric neutrinos
m032 = 1 eV2 LSND/MiniBooNE
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Gallium calibration Reactor, miniboone
G.Mention et al, arXiv: 1101.2755
RGa = 0.87 +/- 0.05
Gallex/GNO 51CrSAGE 51 Cr, 37Ar
Calibration
C Giunti, M. Laveder
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Evolution between two sterile resonances
Interference of two amplitudesof transition
e
Ue1m
Ueom
adiabatic
non-adiabatic
projection transitions
1m
0m
1
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Eth = 1 TeV
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Narrowing the zenith angle interval – enhancesEffect 40 %
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E F Aeff
F = F0 P + Fe
0 Pe +
Flux of muon neutrinos:
~ F0 P
+ F0 P(kE) B
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Production of sterile in the Early universe
Neff = 0.8 - 1
A D Dolgov, F L Villante
can be generated
sin2 2sin2 2
log(
m2
/eV
2 )
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sin2
sin2
0.5 S - mass mixing
sin2 = 1
1.0 S --mixing
With increase of |U0|2
sin2 decreases
sin2 increases, resonance disappears
distortion of the E and Z
distributions becomes weaker
sin2 =
no strong suppression in vertical bin
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For different mixing schemes
Varying |U0|2
sin2 = s24
2 s24
2 + s342
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