Eylem Seç
Measurement of Long Baseline Neutrino Oscillations and Improvements from Deep Learning
Başlık:
Measurement of Long Baseline Neutrino Oscillations and Improvements from Deep Learning
Yazar:
Psihas, Fernanda, author.
ISBN:
9780438065604
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (278 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Advisors: Mark D. Messier Committee members: Herb Fertig; Jon Urheim; Rick Van Kooten.
Özet:
NOvA is a long-baseline neutrino oscillation experiment which measures the oscillation of muon neutrinos from the NuMI beam at Fermilab after they travel through the Earth for 810 km. In this dissertation I describe the operations and monitoring of the detectors which make it possible to record over 98% of the delivered neutrino beam. I also present reconstruction and identification techniques using deep convolutional neural networks (CNNs), which are applicable to multiple analyses. Lastly, I detail the oscillation analyses in the numu → numu and nu mu → nue channels on a dataset of 8.85 x 10 20 protons on target, with emphasis on the application of deep learning, energy reconstruction, and treatment of systematic uncertainties.
The CNN single particle identifier achieves 65%, 73%, 74%, 83%, and 45% efficiency and 81%, 71%, 86%, 73%, and 45% purity for electrons, photons, muons, protons, and pions, respectively, with no additional selection. The identification of signal events using CNNs achieves 93% purity and 31% efficiency for muon neutrinos and 66% purity and 64% efficiency for electron neutrinos, with no ad- ditional selection. The number of events in the energy region of interest is 66 over 20.5 expected background events for appeared electron neutrinos and 126 over 9.2 background events for surviving muon neutrinos, with leading uncertainties from cross sections, calibration, and near/far normaliza- tion. These results, fit to the three flavor model of neutrino oscillations with constraints from known oscillation parameters are consistent with values of sin2 theta23 = 0.558+0.041 --0.033, Deltam232 = 2.444 +0.079--0.077 x 10--3 eV2, and deltaCP = 1.213pi with a preference for the normal neutrino hierarchy at a significance level of 1.8sigma.
Notlar:
School code: 0093
Konu Başlığı:
Tüzel Kişi Ek Girişi:
Mevcut:*
Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(692195.1) | 692195-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
On Order
Liste seç
Bunu varsayılan liste yap.
Öğeler başarıyla eklendi
Öğeler eklenirken hata oldu. Lütfen tekrar deneyiniz.
:
Select An Item
Data usage warning: You will receive one text message for each title you selected.
Standard text messaging rates apply.