sterile neutrinos altered dispersion relations
TRANSCRIPT
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dortmund
Sterile Neutrinos with
Altered Dispersion Relations as an Explanation for
MiniBooNE, LSND, Gallium & Reactor Anomalies
- Heinrich Päs - tu
August 22, 2019
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2018/19: What’s new?
‣ MiniBooNE anomaly: 4.8σ (+LSND: 6.1σ) arXiv:1805.12028
‣ A working phenomenological framework arXiv:1808.07734
‣ An extra-dimensional model yielding the phenomenology as 4D EFT limit arXiv:1808.07460
‣ Fits to MiniBooNE & LSND data Work in progress with Dominik Döring, En-Chuan Huang & Bill Louis
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Outline
‣ Neutrino Physics Overview‣ The case for sterile neutrinos‣ Altered dispersion relations: The basic idea‣ A phenomenological framework‣ An extra-dimensional model‣ Cosmological bounds & consequences
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Outline
‣ Neutrino Physics Overview‣ The case for sterile neutrinos‣ Altered dispersion relations: The basic idea‣ A phenomenological framework‣ An extra-dimensional model‣ Cosmological bounds & consequences
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4 years ago…
W W
ν1
ν2νe
νµ
e µ+
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Neutrino Oscillations: 2 Flavor Case
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Neutrino Oscillations: 2 Flavor Case
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Neutrino Oscillations: 2 Flavor Case
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…2018/19: Precision Science
Mariam Tortola, Talk at Neutrino2018
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Global data fits
Δm2’s and mixing angles determined at
the few-% Level
Consistent picture of 3-neutrino mixingMariam Tortola,
Talk at Netrino2018
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Open Questions
‣ Absolute Mass Scale? →KATRIN, Cosmology, 0vBB Decay
‣ Mass Hierarchy? →3σ preference for NO
‣ CP Violation? →2σ (NO)/3.8σ (IO) evidence for CPV →Best fit 3π/2
‣ Mechanism of Neutrino Mass Generation?‣ Dirac or Majorana? →Lepton Number Violation?, 0vBB Decay
‣ More than 3 Neutrinos? →Reactor, Gallium, LSND & MiniBooNE anomalies
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Open Questions
‣ Absolute Mass Scale? →KATRIN, Cosmology, 0vBB Decay
‣ Mass Hierarchy? →3σ preference for NO
‣ CP Violation? →2σ (NO)/3.8σ (IO) evidence for CPV →Best fit 3π/2
‣ Mechanism of Neutrino Mass Generation?‣ Dirac or Majorana? →Lepton Number Violation?, 0vBB Decay
‣ More than 3 Neutrinos? →Reactor, Gallium, LSND & MiniBooNE anomalies
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Outline
‣ Neutrino Physics Overview‣ The case for sterile neutrinos‣ Altered dispersion relations: The basic idea‣ A phenomenological framework‣ An extra-dimensional model‣ Cosmological bounds & consequences
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Sterile Neutrinos?
Physics, American Physical Society, November 26, 2018
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Sterile Neutrinos?
Gal
lium
Ano
mal
y
Rea
ctor
Ano
mal
y
LSND/MiniBooNE Anomaly
En-Chuan Huang, Talk
at Netrino2018
“HypotheticalMSW-like
resonance model”→
All pointing
towards a 1 eV
sterile neutrino!
𝝂𝝁 → 𝝂e
𝝂e →
𝝂e
𝝂e → 𝝂e
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Sterile Neutrinos?
→ Add a sterile neutrino with ∆m2 ~ 1 eV2
To explain LSND/MiniBooNE: 𝝂s -mixing with both 𝝂e and 𝝂𝝁 :
Con
rad
/Sha
evitz
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Sterile Neutrinos?
→ Add a sterile neutrino with ∆m2 ~ 1 eV2
To explain LSND/MiniBooNE: 𝝂s -mixing with both 𝝂e and 𝝂𝝁 :
Con
rad
/Sha
evitz
constrained by 𝝂𝝁 disappearance
constrained by 𝝂e disappearance
Giunti, Zavanin, 2015
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Sterile Neutrinos?
Dentler, Hernandez-Cabezudo, Kopp, Machado, Maltoni, Martinez-Soler, Schwetz, 2018
Appearance versus Disappearance Experiments
Bill Louis, TomFest, august 2019
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Alternative Explanations?
‣ Heavy particle decay Bertuzzo, Jana, Machado, Zukanovich Funchal, 2018; Ballett, Pascoli, Ross-Lonergan, 2018 →Reactor and Gallium anomalies? → severely constrained by MiniBooNE electron-like event energy and angular distributions in the full MiniBooNE data-set Jordan et al., 2018
‣ Non-Standard Interactions Liao, Marfatia, Whisnant, 2018; Denton, Farzan, Shoemaker, 2018 →resonant-like structure in MiniBooNE?
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There is NO compelling reason to believe that a sterile neutrino
should behave just as the SM neutrinos
A 4th sterile neutrino ?
Sterile netrinos can have a very different origin than the SM neutrinos (e.g. superpartners of dilaton, radion or other moduli fields, mirror world
fermions, etc...)
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Outline
‣ Neutrino Physics Overview‣ The case for sterile neutrinos‣ Altered dispersion relations: The basic idea‣ A phenomenological framework‣ An extra-dimensional model‣ Cosmological bounds & consequences
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Evidence for light sterile v is partly conflicting!
‣ May be wrong!‣ May hint towards deviations from the usual oscillation
mechanism!‣ Sterile neutrinos as messengers of exciting new physics?
E = p + m2/2E + new terms
Attractive candidate: Altered dispersion relations
Sterile neutrino Altered Dispersion Relations
→ novel energy dependence! HP, Pakvasa, Weiler 2005
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Sterile neutrino Altered Dispersion Relations
E = p + m2/2E + new terms
Attractive candidate: Altered dispersion relations
‣ Exotic matter effects, new interactions [Nelson…] →relevant for either 𝝂 or anti-𝝂 !
‣ Lorentz violation [Barenboim, Quigg, Kostelecky….]
‣ Shortcuts in extra dimensions [HP, Pakvasa, Weiler…]
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Sterile neutrino Altered Dispersion Relations
E = p + m2/2E + new terms
Attractive candidate: Altered dispersion relations
‣ Exotic matter effects, new interactions [Nelson…] →relevant for either 𝝂 or anti-𝝂 !
‣ Lorentz violation [Barenboim, Quigg, Kostelecky….]
‣ Shortcuts in extra dimensions [HP, Pakvasa, Weiler…]
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Altered dispersion relations: vanilla type
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Altered dispersion relations: vanilla type
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Altered dispersion relations: vanilla type
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MiniBooNE 2018 HP, Pakvasa, Weiler 2005
Altered dispersion relations: vanilla type
→ resonance-like features!
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MiniBooNE 2018 HP, Pakvasa, Weiler 2005
Altered dispersion relations: vanilla type
→ resonance-like features!
3+1 𝝂 Resonance
3 𝝂
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P. Huber, 2007
Altered dispersion relations: vanilla type
“A nice model - but unfortunately it doesn’t work”
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Altered dispersion relations with 3+1 neutrinos
‣ 2 mass eigenstates with large effective masses!‣ Large Δm2’s‣ Fast oscillations:
‣ Sterile neutrino ADR’s excluded by atmospheric v L/E !!!
[Marfatia, HP, Pakvasa, Weiler, 2012]
[P. Huber, 2007]
FastOscillations!
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Altered dispersion relations with 3+1 neutrinos
mainly active
mainly 𝝂s
}{
small Δm2 large Δm2 flavor swapldevel crossing gap
So what’s the problem?
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Outline
‣ Neutrino Physics Overview‣ The case for sterile neutrinos‣ Altered dispersion relations: The basic idea‣ A phenomenological framework‣ An extra-dimensional model‣ Cosmological bounds & consequences
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Solution ?
→ Promote the model to 3+3
Döring, HP, Sicking, Weiler, arXiv:1808.07460
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Solution ?
→ Promote the model to 3+3
Döring, HP, Sicking, Weiler, arXiv:1808.07460
3v scheme with unaltered’s Δm2’s
Sterile v’sdecouple!
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Sterile Neutrinos?
Döring, HP, Sicking, Weiler,
arXiv:1808.07460
In a 3+3 model with democratic mixing the
sterile neutrino decouples completely at
high energies
Looks just like
3v!
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Döring, HP, Sicking, Weiler,
arXiv:1808.07460
Necessary: Different resonance energies for 3 sterile neutrinos to avoid
unitarity cancellation!
Altered dispersion relations with 3+3 neutrinos
No 𝝂𝝁 disappearance!
Huge 𝝂𝝁 disappearance!Test: SBN, CCM
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sub-GeV Super-K data?
Döring, HP, Sicking, Weiler, arXiv:1808.07460
Limited statistics!
Fast oscillations @ E <1 GeV!
Super-K, arXiv:1410.2008
Poor distance
resolution?
Super-K sub-GeV data?
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Fitting LSND & MiniBooNE
Bill Louis, Talk @ TomFest, August 14, 2019
2v Fit 3+3 ADR Fit
Fits Courtesy of En-Chuan Huang
Excluded by CDHS,
MINOS, …
Not excluded!
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Fitting LSND & MiniBooNE
Bill Louis, Talk @ TomFest, August 14, 2019
3+3 ADR Fit:Resonance Energies
Fit Courtesy: En-Chuan Huang
Resonant energies result at:
ERes1,2=30 MeVERes3=330 MeV
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Fitting LSND & MiniBooNE
Bill Louis, Talk @ TomFest, August 14, 2019
3+3 ADR Fit & Reactor Anomaly
Fit Courtesy: En-Chuan Huang
Perfect agreement with reactor results!
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Fitting LSND & MiniBooNE
3+3 ADR Fit & Reactor Anomaly
Dentler, Hernandez-Cabezudo, Kopp, Machado, Maltoni,
Martinez-Soler, Schwetz, 2018
Perfect agreement with reactor results!
1 5 10E in MeV
0.90
0.95
1.00
1.05Pee
Best Fit NEOS+DayaBay: Probabilities û NEOSDm2
BF,NEOS+DB=1.78 eV 2, sin2qBF,NEOS+DB =0.0130Dm2
BF,6 nûMB=1.75 eV 2 , sin2qBF,6 nûMB =0.0143 , L=23.7m,
4n BF NEOS+DayaBay
6n+ADR ûBF MiniBooNE
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Fitting LSND & MiniBooNE
Dentler, Hernandez-Cabezudo, Kopp, Machado, Maltoni,
Martinez-Soler, Schwetz, 2018
as with the Gallium anomaly…
Kostensalo, Suhonen, Giunti, Srivastava, 2019
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Baroque?
‣ Required: ADRs‣ 3 active flavors - 3 steriles‣ symmetry: democratic Δm2’s &
mixing angles for all steriles ‣ 3 space dimensions - 3 extra
dimensions‣ No finetuning!‣ Resonance predicted and
MiniBooNE/LSND fit yields reactor/Gallium best fit!
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Outline
‣ Neutrino Physics Overview‣ The case for sterile neutrinos‣ Altered dispersion relations: The basic idea‣ A phenomenological framework‣ An extra-dimensional model‣ Cosmological bounds & consequences
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Model Building ?
extra dimension
"our brane"
warped parallel hypersurface
warp
warp
Text
Consider an asymmetrically warped extra dimension with a sterile neutrino in the bulk
‣ Shrinks space parallel to the brane‣ Allows for shortcuts in
the extra dimension!
Chung, Freese, 1999, 2000Csaki, Erlich, Grojean, 2001
[D. Döring, HP, arXiv:1808.07734]
[HP, S. Pakvasa, T. Weiler, PRD72 (2005) 095017]
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Sterile v’s in asymmetrically warped extra dimensions
‣ 2 gauge singlet neutrinos: mass generation & propagation in extra dimensions
‣ Compactification on S1/Z2: Kaluza-Klein spectrum & effective 4D 𝝂s ADR
as in RS-1 scenarios
[Döring, HP, arXiv:1808.07734
ADR: 4D EFT limit!
PropagationEigenstates:
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Causality?
[HP, S. Pakvasa, J. Dent, T. Weiler, PRD 80 (2009) 044008]
Neutrino Time Travel ?
superluminal signal
superluminal signal
Future moving observer
Past
No: Globally hyperbolic,
defined time direction
But: 2 asymmetrically warped extra dimensions with a
relative boost can do the job!
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Outline
‣ Neutrino Physics Overview‣ The case for sterile neutrinos‣ Altered dispersion relations: The basic idea‣ A phenomenological framework‣ An extra-dimensional model‣ Cosmological bounds & consequences
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Big Bang Nucleosynthesis
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Big Bang Nucleosynthesis
Similar aguments work for other
cosmological bounds!
vs
Aeikens, HP, Pakvasa, Weiler, 2016
allowed regions
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x
u
Astrophysical Flavor Ratios
Expectation pion source:
Flavor Ratio at the source: 1:2:0
Maximal νμ-ντ mixing: Decoherence →
Flavor Ratio: 1:1:1 at Earth
‣Geodesics: oscillating around the brane‣ Shortcut “switched on
and off”→ new baseline effect‣MSW analogue:
resonant conversion
Hollenberg, HP, Micu, Weiler, 2009
Aeikens, HP, Pakvasa, Sicking, 2014
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Astrophysical Flavor Ratios
Level crossing: shortcut parameter has to be
large enough?
Adiabaticity ?
4:1:1 possible in large regions of parameter
space, 0:0:0 possible at high Energies !
Aeikens, HP, Pakvasa, Sicking, 2014
Periodicity
War
p Fa
ctor
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Lorentz violation & multi-messenger astronomy
Necessary for LSND/MiniBooNE
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Summary
‣ Quite possible: MiniBooNE & other anomalies due to backgrounds or systematics
‣ Simple oscillation models: conflict with CDHS, MINOS…‣ But keep in mind “1 eV2 miracle”‣ ADR v oscillations: energy dependence & resonance‣ Excellent fit to MiniBooNE & LSND‣ Fits also reactor & Gallium anomalies‣ No conflict with high energy 𝝂𝝁 disappearance (CDHS…)‣ Crucial tests: CCM, SBN, ICARUS, MicroBooNE‣ One possible ADR model: shortcuts in extra dimensions‣ Interesting cosmological consequences