Studying atmospheric neutrino oscillations in the few-GeV range with a multi- megaton detector promises to determine the neutrino mass hierarchy. This is the main science goal pursued by the future KM3NeT/ORCA water Cherenkov detector in the Mediterranean Sea. In this paper, the processes that limit the obtainable resolution in both energy and direction in charged-current neutrino events in the ORCA detector are investigated. These processes include the composition of the hadronic fragmentation prod- ucts, the subsequent particle propagation and the photon-sampling fraction of the detector. GEANT simulations of neutrino interactions in seawater produced by GENIE are used to study the e ects in the 1{20 GeV range. It is found that uctuations in the hadronic cas- cade in conjunction with the variation of the inelasticity y are most detrimental to the resolutions. The e ect of limited photon sampling in the detector is of signi cantly less importance. These results will therefore also be applicable to similar detectors/media, such as those in ice.

Intrinsic limits on resolutions in muon- and electron-neutrino charged-current events in the KM3NeT/ORCA detector

BOZZA, Cristiano;DE SIO, CHIARA;Fusco, L. A.;GRELLA, Giuseppe;Stellacci, S. M.;
2017

Abstract

Studying atmospheric neutrino oscillations in the few-GeV range with a multi- megaton detector promises to determine the neutrino mass hierarchy. This is the main science goal pursued by the future KM3NeT/ORCA water Cherenkov detector in the Mediterranean Sea. In this paper, the processes that limit the obtainable resolution in both energy and direction in charged-current neutrino events in the ORCA detector are investigated. These processes include the composition of the hadronic fragmentation prod- ucts, the subsequent particle propagation and the photon-sampling fraction of the detector. GEANT simulations of neutrino interactions in seawater produced by GENIE are used to study the e ects in the 1{20 GeV range. It is found that uctuations in the hadronic cas- cade in conjunction with the variation of the inelasticity y are most detrimental to the resolutions. The e ect of limited photon sampling in the detector is of signi cantly less importance. These results will therefore also be applicable to similar detectors/media, such as those in ice.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4682254
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