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3rd Oscillations Working Group Report: I t just got interesting

3rd Oscillations Working Group Report: I t just got interesting. Kurt Woschnagg* UC Berkeley *WG co-lead with Ty DeYoung. IceCube collaboration meeting, Banff, March 8 , 2014. Atmospheric Neutrino Oscillations. Search for muon neutrino disappearance in DeepCore data .

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3rd Oscillations Working Group Report: I t just got interesting

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  1. 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

  2. Atmospheric Neutrino Oscillations Search for muon neutrino disappearance in DeepCore data

  3. Atmospheric Neutrino Oscillations Theoretical oscillogram Observables Likelihood scan in parameter space Search for muon neutrino disappearance in DeepCore data

  4. Current νμdisappearance results Other analyses, including ντ appearance, in event selection stage → Low-Energy Summary by Jason K.

  5. 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

  6. Confidence contours with Multillh

  7. Confidence contours with Multillh

  8. IC79 νμdisappearance: data challenge Laura Gladstone (UW)

  9. IC86 νμdisappearance: multiyear extension Juan Pablo Yáñez (DESY) Results from IC86-I analysis:

  10. IC86 νμdisappearance: multiyear extension Juan Pablo Yáñez (DESY) Extension to three years: (LE summary has details)

  11. IC86 νμdisappearance: new energy estimator Use combinedReco by AndriiTerliuk

  12. IC86 νμdisappearance: new energy estimator

  13. IC86 νμdisappearance: new energy estimator

  14. 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

  15. IC86 νμ disappearance: background template

  16. IC86 νμ disappearance: background template

  17. IC86 νμdisappearance: gains in statistics Take three years instead of one: +200% Remove faulty selection logic: +40% Remove RTVeto cut: +20% Total increase: 1500 events to 7500 events

  18. And it all adds up to… Sensitivity for three years of IC86 data Now we’re talking!

  19. Upgoingνμ survival probability Standard 3-flavor oscillations Vacuum only Including Matter 3 Flavors 3 Flavors With a sterile neutrino Vacuum only Including Matter 4 Flavors 4 Flavors

  20. 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 Pulls: Experiment and Best Fit relative to Null Ratio: Experiment and Best Fit relative to Null

  21. 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) Dm422 = 0.156 eV2 q24 = 17°

  22. 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

  23. IC86 sensitivity (one year) Disfavored by cosmological data

  24. Burn sample fits IC79 IC59 IC86

  25. IC79+IC86 sterile neutrino search: outlook + Explain things like this: IC86 IC59

  26. Conclusions IceCube is competitive with dedicated oscillation experiments Marius maynot graduate for a while… We will have frequent oscillation calls

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