3rd oscillations working group report: i t just got interesting
DESCRIPTION
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 . - PowerPoint PPT PresentationTRANSCRIPT
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
Atmospheric Neutrino Oscillations
Search for muon neutrino disappearance in DeepCore data
Atmospheric Neutrino Oscillations
Search for muon neutrino disappearance in DeepCore data
Theoretical oscillogram
Observables
Likelihood scan inparameter space
Current νμ disappearance results
Other analyses, including ντ appearance, in event selection stage→ Low-Energy Summary by Jason K.
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)
Confidence contours with Multillh
Confidence contours with Multillh
IC79 νμ disappearance: data challengeLaura Gladstone (UW)
IC86 νμ disappearance: multiyear extensionJuan Pablo Yáñez (DESY)Results from IC86-I analysis:
IC86 νμ disappearance: multiyear extensionJuan Pablo Yáñez (DESY)Extension to three years:
(LE summary has details)
IC86 νμ disappearance: new energy estimatorUse combinedReco by Andrii Terliuk
IC86 νμ disappearance: new energy estimator
IC86 νμ disappearance: new energy estimator
IC86 νμ disappearance: background templateNeed background template for likelihood fit
Relaxed veto cuts to estimate background from CORSIKA
New approach: estimate background from data
IC86 νμ disappearance: background template
IC86 νμ disappearance: background template
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
And it all adds up to…Sensitivity for three years of IC86 data
Now we’re talking!
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
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)
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°
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
IC86 sensitivity (one year)
Disfavored by cosmological data
Burn sample fits
IC79
IC86
IC59
IC79+IC86 sterile neutrino search: outlook
+ Explain things like this:
IC86 IC59
1. IceCube is competitive with dedicated oscillation experiments
2. Marius may not graduate for a while…
3. We will have frequent oscillation calls
Conclusions