WG colead with Ty DeYoung IceCube collaboration meeting Banff March 8 2014 3rd Oscillations Working Group Report I t just got interesting Atmospheric Neutrino Oscillations Search for ID: 627714
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Slide1
Kurt Woschnagg*UC Berkeley*WG co-lead with Ty DeYoung
IceCube collaboration meeting, Banff, March 8, 2014
3rd Oscillations Working Group Report:
I
t just got interestingSlide2
Atmospheric Neutrino Oscillations
Search for muon neutrino disappearance in
DeepCore data Slide3
Atmospheric Neutrino OscillationsSearch for muon neutrino disappearance in
DeepCore data
Theoretical
oscillogram
Observables
Likelihood scan in
parameter spaceSlide4
Current νμ disappearance results
Other analyses, including ντ appearance, in event selection stage→ Low-Energy Summary by Jason K.Slide5
IC79 νμ disappearance: final level expectationsEvent rates (normalized to burn sample)
35% energy error
down to ~15
GeVu
sing Monopod
~7000 events in full sample
~80% neutrino purity
n
eeds to be understood
Laura Gladstone (UW)Slide6
Confidence contours with MultillhSlide7
Confidence contours with MultillhSlide8
IC79 νμ disappearance: data challenge
Laura Gladstone (UW)Slide9
IC86 νμ disappearance: multiyear extensionJuan Pablo Yáñez (DESY)
Results from IC86-I analysis:Slide10
IC86 νμ disappearance: multiyear extensionJuan Pablo Yáñez (DESY)
Extension to three years:
(LE summary has details)Slide11
IC86 νμ disappearance: new energy estimatorUse
combinedReco by Andrii TerliukSlide12
IC86 νμ disappearance: new energy estimatorSlide13
IC86 νμ disappearance: new energy estimatorSlide14
IC86 νμ disappearance: background templateNeed background template for likelihood fit
Relaxed veto cuts to estimate background from CORSIKA
New approach: estimate background from dataSlide15
IC86 νμ disappearance: background templateSlide16
IC86 νμ disappearance: background templateSlide17
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 eventsSlide18
And it all adds up to…Sensitivity for three years of IC86 data
Now we’re talking!Slide19
Upgoing νμ survival probability
Vacuum only
3 Flavors
Including Matter
3 Flavors
4 Flavors
Vacuum only
4 Flavors
Including Matter
Standard 3-flavor oscillations
With a sterile neutrinoSlide20
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
)Slide21
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
m
42
2
= 0.156 eV
2
q
24
= 17°Slide22
IC79+IC86 sterile neutrino searchCarlos 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 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”) beforeSlide23
IC86 sensitivity (one year)
Disfavored by cosmological dataSlide24
Burn sample fitsIC79
IC86
IC59Slide25
IC79+IC86 sterile neutrino search: outlook+ Explain things like this:
IC86
IC59Slide26
IceCube is competitive with dedicated oscillation experiments
Marius
may not graduate for a
while…
We will have frequent oscillation calls
Conclusions