Improving the neutrino mass hierarchy identification with inelasticity measurement in PINGU and ORCA

Multimegaton scale in under-ice and underwater detectors of atmospheric neutrinos with a few GeV energy threshold (PINGU, ORCA) open up new possibilities in the determination of neutrino properties, and in particular the neutrino mass hierarchy. With a dense array of optical modules it will be possi...

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Published in:Physical Review D
Main Authors: Ribordy, Mathieu, Smirnov, A. Yu.
Format: Text
Language:unknown
Published: College Pk, Amer Physical Soc 2013
Subjects:
Online Access:https://doi.org/10.1103/PhysRevD.87.113007
http://infoscience.epfl.ch/record/188953
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spelling ftinfoscience:oai:infoscience.tind.io:188953 2023-05-15T17:53:36+02:00 Improving the neutrino mass hierarchy identification with inelasticity measurement in PINGU and ORCA Ribordy, Mathieu Smirnov, A. Yu. 2013-10-01T07:28:27Z https://doi.org/10.1103/PhysRevD.87.113007 http://infoscience.epfl.ch/record/188953 unknown College Pk, Amer Physical Soc doi:10.1103/PhysRevD.87.113007 ISI:000320764600002 http://infoscience.epfl.ch/record/188953 http://infoscience.epfl.ch/record/188953 Text 2013 ftinfoscience https://doi.org/10.1103/PhysRevD.87.113007 2023-02-13T22:15:58Z Multimegaton scale in under-ice and underwater detectors of atmospheric neutrinos with a few GeV energy threshold (PINGU, ORCA) open up new possibilities in the determination of neutrino properties, and in particular the neutrino mass hierarchy. With a dense array of optical modules it will be possible to determine the inelasticity, y, of the charged current nu(mu) events in addition to the neutrino energy E-nu and the muon zenith angle theta(mu). The discovery potential of the detectors will substantially increase with the measurement of y. It will enable (i) a partial separation of the neutrino and antineutrino signals, (ii) a better reconstruction of the neutrino direction, (iii) the reduction of the neutrino parameters degeneracy, (iv) a better control of systematic uncertainties, and (v) a better identification of the nu(mu) events. It will improve the sensitivity to the CP-violation phase. The three-dimensional (E-nu, theta(mu), y), nu(mu) oscillograms with the kinematical as well as the experimental smearing are computed. We present the asymmetry distributions in the E-nu - theta(mu) plane for different intervals of y and study their properties. We show that the inelasticity information reduces the effect of degeneracy of parameters by 30%. With the inelasticity, the total significance of establishing mass hierarchy may increase by (20-50)%, thus effectively increasing the volume of the detector by a factor of 1.5-2. Text Orca EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) Pingu ENVELOPE(-52.017,-52.017,67.067,67.067) Physical Review D 87 11
institution Open Polar
collection EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne)
op_collection_id ftinfoscience
language unknown
description Multimegaton scale in under-ice and underwater detectors of atmospheric neutrinos with a few GeV energy threshold (PINGU, ORCA) open up new possibilities in the determination of neutrino properties, and in particular the neutrino mass hierarchy. With a dense array of optical modules it will be possible to determine the inelasticity, y, of the charged current nu(mu) events in addition to the neutrino energy E-nu and the muon zenith angle theta(mu). The discovery potential of the detectors will substantially increase with the measurement of y. It will enable (i) a partial separation of the neutrino and antineutrino signals, (ii) a better reconstruction of the neutrino direction, (iii) the reduction of the neutrino parameters degeneracy, (iv) a better control of systematic uncertainties, and (v) a better identification of the nu(mu) events. It will improve the sensitivity to the CP-violation phase. The three-dimensional (E-nu, theta(mu), y), nu(mu) oscillograms with the kinematical as well as the experimental smearing are computed. We present the asymmetry distributions in the E-nu - theta(mu) plane for different intervals of y and study their properties. We show that the inelasticity information reduces the effect of degeneracy of parameters by 30%. With the inelasticity, the total significance of establishing mass hierarchy may increase by (20-50)%, thus effectively increasing the volume of the detector by a factor of 1.5-2.
format Text
author Ribordy, Mathieu
Smirnov, A. Yu.
spellingShingle Ribordy, Mathieu
Smirnov, A. Yu.
Improving the neutrino mass hierarchy identification with inelasticity measurement in PINGU and ORCA
author_facet Ribordy, Mathieu
Smirnov, A. Yu.
author_sort Ribordy, Mathieu
title Improving the neutrino mass hierarchy identification with inelasticity measurement in PINGU and ORCA
title_short Improving the neutrino mass hierarchy identification with inelasticity measurement in PINGU and ORCA
title_full Improving the neutrino mass hierarchy identification with inelasticity measurement in PINGU and ORCA
title_fullStr Improving the neutrino mass hierarchy identification with inelasticity measurement in PINGU and ORCA
title_full_unstemmed Improving the neutrino mass hierarchy identification with inelasticity measurement in PINGU and ORCA
title_sort improving the neutrino mass hierarchy identification with inelasticity measurement in pingu and orca
publisher College Pk, Amer Physical Soc
publishDate 2013
url https://doi.org/10.1103/PhysRevD.87.113007
http://infoscience.epfl.ch/record/188953
long_lat ENVELOPE(-52.017,-52.017,67.067,67.067)
geographic Pingu
geographic_facet Pingu
genre Orca
genre_facet Orca
op_source http://infoscience.epfl.ch/record/188953
op_relation doi:10.1103/PhysRevD.87.113007
ISI:000320764600002
http://infoscience.epfl.ch/record/188953
op_doi https://doi.org/10.1103/PhysRevD.87.113007
container_title Physical Review D
container_volume 87
container_issue 11
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