3rd Oscillations Working Group Report: I t just got interesting
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Transcript of 3rd Oscillations Working Group Report: I t just got interesting
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Kurt Woschnagg*UC Berkeley
*WG co-lead with Ty DeYoung
IceCube collaboration meeting, Banff, March 8, 2014
3rd Oscillations Working Group Report:It just got interesting
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Atmospheric Neutrino Oscillations
Search for muon neutrino disappearance in DeepCore data
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Atmospheric Neutrino Oscillations
Search for muon neutrino disappearance in DeepCore data
Theoretical oscillogram
Observables
Likelihood scan inparameter space
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Current νμ disappearance results
Other analyses, including ντ appearance, in event selection stage→ Low-Energy Summary by Jason K.
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IC79 νμ disappearance: final level expectationsEvent rates (normalized to burn sample)
35% energy errordown to ~15 GeVusing Monopod
~7000 events in full sample
~80% neutrino purity
needs to be understood
Laura Gladstone (UW)
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Confidence contours with Multillh
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Confidence contours with Multillh
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IC79 νμ disappearance: data challengeLaura Gladstone (UW)
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IC86 νμ disappearance: multiyear extensionJuan Pablo Yáñez (DESY)Results from IC86-I analysis:
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IC86 νμ disappearance: multiyear extensionJuan Pablo Yáñez (DESY)Extension to three years:
(LE summary has details)
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IC86 νμ disappearance: new energy estimatorUse combinedReco by Andrii Terliuk
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IC86 νμ disappearance: new energy estimator
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IC86 νμ disappearance: new energy estimator
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IC86 νμ disappearance: background templateNeed background template for likelihood fit
Relaxed veto cuts to estimate background from CORSIKA
New approach: estimate background from data
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IC86 νμ disappearance: background template
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IC86 νμ disappearance: background template
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IC86 νμ disappearance: gains in statisticsTake three years instead of one: +200%Remove faulty selection logic: +40%
Remove RTVeto cut: +20%
Total increase: 1500 events to 7500 events
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And it all adds up to…Sensitivity for three years of IC86 data
Now we’re talking!
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Upgoing νμ survival probability
Vacuum only
3 Fl
avor
s
Including Matter
3 Fl
avor
s
4 Fl
avor
s
Vacuum only
4 Fl
avor
s Including Matter
Standard 3-flavor oscillations
With a sterile neutrino
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IC59 sterile neutrino search (from Friday plenary)
Marius Wallraff, Christopher Wiebusch (Aachen)
Warning, the fit is 2-d Shown are projections
Ratio: Experiment and Best Fit relative to Null Pulls: Experiment and Best Fit relative to Null
IC59 diffuse HE sample(A. Schukraft)
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IC59 sterile neutrino search (from Friday plenary)
Marius Wallraff, Christopher Wiebusch (Aachen)Significances calculated from log L = log L(Best fit) – log L(null) (assuming 2 dof)
m422 = 0.156 eV2
q24 = 17°
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IC79+IC86 sterile neutrino searchCarlos Argüelles Delgado, Jordi Salvadó Serra (Madison)
IC79+IC86 diffuse HE samples (C. Weaver)Higher energy range than IC59 sampleDifferent theoretical approach to calculating oscillation probabilitiesAs in IC59 analysis, action is in zenith angle:
Caution: We have had a zenith dip at -0.4 due to a bug (“the NiuGen bug”) before
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IC86 sensitivity (one year)
Disfavored by cosmological data
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Burn sample fits
IC79
IC86
IC59
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IC79+IC86 sterile neutrino search: outlook
+ Explain things like this:
IC86 IC59
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1. IceCube is competitive with dedicated oscillation experiments
2. Marius may not graduate for a while…
3. We will have frequent oscillation calls
Conclusions