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Title: First Results of $$\nu_e$$ Appearance Analysis and Electron Neutrino Identification at NOvA

NOvA is a long-baseline accelerator-based neutrino oscillation experiment that is optimized for $$\nu_\mu\to\nu_e$$ measurements. It uses the upgraded NuMI beam from Fermilab and measures electron-neutrino appearance and muon-neutrino disappearance at its Far Detector in Ash River, Minnesota. The $$\nu_e$$ appearance analysis at NOvA aims to resolve the neutrino mass hierarchy problem and to constrain the CP-violating phase. The first data set of $$2.74\times10^{20}$$ protons on target (POT) equivalent exposure taken by NOvA has been analyzed. The first measurement of electron-neutrino appearance in NOvA provides solid evidence of $$\nu_\mu\to\nu_e$$ oscillation with the NuMI beam line. Electron-neutrino identification is the key ingredient for the $$\nu_e$$ appearance analysis. The electron-identification algorithm used to produce the primary results presented here compares 3-D shower-energy profiles with Monte Carlo prototypes to construct likelihoods for each particle hypothesis. Particle likelihoods, among other event-topology variables, are used as inputs to an Artificial Neural Network for the final electron-neutrino identification. The design and implementation of this algorithm is also presented.
Authors:
 [1]
  1. Minnesota U.
Publication Date:
OSTI Identifier:
1250484
Report Number(s):
arXiv:1510.05708; FERMILAB-CONF-15-534-E
1399048
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: Meeting of the APS Division of Particles and Fields, Ann Arbor, Michigan, USA, 08/04-08/08/2015
Research Org:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
NOvA
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS