measurement of the atmospheric muon neutrino energy spectrum with icecube in the 79- and 86-string...
TRANSCRIPT
![Page 1: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/1.jpg)
Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration
Tim Ruhe, Mathis Börner, Florian Scheriau, Martin Schmitz, TU Dortmund
Flu
x
Energy
![Page 2: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/2.jpg)
2
Outline
IceCube and atmospheric neutrinos Event Selection Spectrum Unfolding Results Summary and Outlook
![Page 3: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/3.jpg)
3
IceCube and atmospheric neutrinos
Tim Ruhe | Statistische Methoden der Datenanalyse
![Page 4: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/4.jpg)
4
Data Preprocessing
Cut on zenith angle > 86°
Redcution of the data volume,
BUT remaining background is significantly harder to reject
Additional cuts:
Lepton velocity Empty Hits Truncated Energy (estimator) Track length
![Page 5: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/5.jpg)
5
Feature Selection Stability
BA
BAJ
Jaccard:
Average over many sets of variables:
Number of Variables
Jacc
ard
Inde
x
![Page 6: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/6.jpg)
6
Training and Validation of a Random Forest
treesn
ii
trees
sn
s0
1
use an ensemble of simple decision trees
Obtain final classification as an average over all trees
![Page 7: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/7.jpg)
7
Random Forest Output
200 trees 5 Random Features per node 120,000 signal events 30,000 background events
Forest Settings:
![Page 8: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/8.jpg)
8
Random Forest Output (IC79)Find a trade-off between background
rejection and signal efficiency
Place a cut at confidence >=0.92
212 neutrino candidates per day 66885 neutrino candidates in total 330±200 background muons
![Page 9: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/9.jpg)
9
Random Forest Output (IC86)
2-dimensional cut
289 neutrino candidates per day 92060 neutrino candidates in total 410±220 background muons
![Page 10: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/10.jpg)
10
Why unfold?
Muon production governed by stochastical processes
Energy losses on the way towards the detector
Finite resolution Limited acceptance of the
detector
Inverse Problem, to be solved with TRUEE.
![Page 11: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/11.jpg)
11
Unfolding Input (1): Energy Correlation
Input variables show good correlation with energy
![Page 12: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/12.jpg)
12
Unfolding Input (2): Background Distributions for IC79
Tim Ruhe | Statistische Methoden der Datenanalyse
Background events are located at lower energies
Therefore, they do not affect the highest energy bins
![Page 13: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/13.jpg)
13
Unfolding Input (3): Background Distributions for IC86
Background events are located at lower energies
Therefore, they do not affect the highest energy bins
![Page 14: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/14.jpg)
14
Unfolding Input (3): Background Distributions for IC86
![Page 15: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/15.jpg)
15
Unfolding the spectrum
TRUEE
3 energy dependent input variables
TRUEE
Clear deviation from an atmospheric only prediction
![Page 16: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/16.jpg)
16
More results
Combining the spectra
Unfolding different zenith bands
![Page 17: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/17.jpg)
17
Summary and Outlook
Random Forest &MRMR
TRUEE
![Page 18: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/18.jpg)
18
Backup
Tim Ruhe | Statistische Methoden der Datenanalyse
![Page 19: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/19.jpg)
19
IC86 Precuts
Tim Ruhe | Statistische Methoden der Datenanalyse
![Page 20: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/20.jpg)
20
IC79 Precuts
Tim Ruhe | Statistische Methoden der Datenanalyse
![Page 21: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/21.jpg)
21
Comparison to other measurements
Tim Ruhe | Statistische Methoden der Datenanalyse
![Page 22: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/22.jpg)
22
Relevance vs. Redundancy: MRMR (continuous case)
Relevance: Redundancy:
MRMR: or
![Page 23: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/23.jpg)
23
IC86 Confidence Distributions
Tim Ruhe | Statistische Methoden der Datenanalyse
![Page 24: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/24.jpg)
24
Unfolding Input for IC86
Tim Ruhe | Statistische Methoden der Datenanalyse
![Page 25: Measurement of the Atmospheric Muon Neutrino Energy Spectrum with IceCube in the 79- and 86-String Configuration Tim Ruhe, Mathis Börner, Florian Scheriau,](https://reader035.vdocuments.site/reader035/viewer/2022070410/56649ebc5503460f94bc4d7f/html5/thumbnails/25.jpg)
25
IC86 2D Cut
Tim Ruhe | Statistische Methoden der Datenanalyse