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
Our bread-and-butter analysis: standard oscillations of muon neutrinos into tau neutrinos
Search for muon neutrino disappearance in DeepCore data

3. 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

4. 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.

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 νμ disappearance: data challenge
Laura Gladstone (UW)

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

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

11. IC86 νμ disappearance: new energy estimator
Use combinedReco by Andrii Terliuk

12. IC86 νμ disappearance: new energy estimator

13. IC86 νμ disappearance: 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 νμ disappearance: gains in statistics
Take three years instead of one: %
Remove faulty selection logic: %
Remove RTVeto cut: %
Total increase: events to 7500 events

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

19. 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

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
Ratio: Experiment and Best Fit relative to Null
Pulls: Experiment and Best Fit relative to Null
Action is in the zenith distribution.

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)
D m422 = 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
Make sure significance not statistical artifact of low MC statistics!

26. Conclusions
IceCube is competitive with dedicated oscillation experiments
Marius may not graduate for a while…
We will have frequent oscillation calls