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Published byDoddy Sudjarwadi Modified over 5 years ago
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3rd Oscillations Working Group Report: It just got interesting
Kurt Woschnagg* UC Berkeley *WG co-lead with Ty DeYoung IceCube collaboration meeting, Banff, March 8, 2014
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Atmospheric Neutrino Oscillations
Our bread-and-butter analysis: standard oscillations of muon neutrinos into tau neutrinos Search for muon neutrino disappearance in DeepCore data
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Atmospheric Neutrino Oscillations
Theoretical oscillogram Our bread-and-butter analysis: standard oscillations of muon neutrinos into tau neutrinos Observables Likelihood scan in parameter space Search for muon neutrino disappearance in DeepCore data
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Current νμ disappearance results
Our bread-and-butter analysis: standard oscillations of muon neutrinos into tau neutrinos Other analyses, including ντ appearance, in event selection stage → Low-Energy Summary by Jason K.
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IC79 νμ disappearance: final level expectations
Event rates (normalized to burn sample) Laura Gladstone (UW) ~80% neutrino purity ~7000 events in full sample needs to be understood 35% energy error down to ~15 GeV using Monopod
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Confidence contours with Multillh
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Confidence contours with Multillh
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IC79 νμ disappearance: data challenge
Laura Gladstone (UW)
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IC86 νμ disappearance: multiyear extension
Juan Pablo Yáñez (DESY) Results from IC86-I analysis:
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IC86 νμ disappearance: multiyear extension
Juan Pablo Yáñez (DESY) Extension to three years: (LE summary has details)
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IC86 νμ disappearance: new energy estimator
Use 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 template
Need 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 statistics
Take three years instead of one: % Remove faulty selection logic: % Remove RTVeto cut: % Total increase: events to 7500 events
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And it all adds up to… Now we’re talking!
Sensitivity for three years of IC86 data Now we’re talking!
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Upgoing νμ survival probability
Standard 3-flavor oscillations Vacuum only 3 Flavors Including Matter 3 Flavors With a sterile neutrino 4 Flavors Vacuum only 4 Flavors Including Matter
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IC59 sterile neutrino search (from Friday plenary)
Marius Wallraff, Christopher Wiebusch (Aachen) IC59 diffuse HE sample (A. Schukraft) 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 Action is in the zenith distribution.
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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) D m422 = eV2 q24 = 17°
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IC79+IC86 sterile neutrino search
Carlos Argüelles Delgado, Jordi Salvadó Serra (Madison) IC79+IC86 diffuse HE samples (C. Weaver) Higher energy range than IC59 sample Different theoretical approach to calculating oscillation probabilities As 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 IC59 IC86
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IC79+IC86 sterile neutrino search: outlook
+ Explain things like this: IC86 IC59 Make sure significance not statistical artifact of low MC statistics!
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Conclusions IceCube is competitive with dedicated oscillation experiments Marius may not graduate for a while… We will have frequent oscillation calls
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