Low exposure long-baseline neutrino oscillation sensitivity of the DUNE experiment
2 CERN - European Organization for Nuclear Research
3 University of Oxford
4 Fermilab - Fermi National Accelerator Laboratory
5 UA - Universidad del Atlántico
6 UTFPR - Universidade Tecnológica Federal do Paraná = Federal Technological University of Paraná [Curitiba, Brésil]
7 GTU - Georgian Technical University
8 BNL - Brookhaven National Laboratory [Upton, NY]
9 University of Bristol [Bristol]
10 University of Houston
11 LBNL - Lawrence Berkeley National Laboratory [Berkeley]
12 VECC - Variable Energy Cyclotron Centre
13 University of Warwick [Coventry]
14 LAPP - Laboratoire d'Annecy de Physique des Particules
15 INFN - Istituto Nazionale di Fisica Nucleare, Sezione di Catania
16 University of Sussex
17 University of Colorado [Boulder]
18 ETH Zürich - Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich]
19 Kansas State University
20 USC - Universidade de Santiago de Compostela [España] = University of Santiago de Compostela [Spain] = Université de Saint-Jacques-de-Compostelle [Espagne]
21 ANL - Argonne National Laboratory [Lemont]
22 RAL - STFC Rutherford Appleton Laboratory
23 INFN - Istituto Nazionale di Fisica Nucleare [Ferrara]
24 UniFE - Università degli Studi di Ferrara = University of Ferrara
25 IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
26 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
27 IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
28 APC (UMR_7164) - AstroParticule et Cosmologie
29 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
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Abstract
The Deep Underground Neutrino Experiment (DUNE) will produce world-leading neutrino oscillation measurements over the lifetime of the experiment. In this work, we explore DUNE’s sensitivity to observe charge-parity violation (CPV) in the neutrino sector, and to resolve the mass ordering, for exposures of up to 100 kiloton-megawatt-calendar years (kt-MW-CY), where calendar years include an assumption of 57% accelerator uptime based on past accelerator performance at Fermilab. The analysis includes detailed uncertainties on the flux prediction, the neutrino interaction model, and detector effects. We demonstrate that DUNE will be able to unambiguously resolve the neutrino mass ordering at a 4σ (5σ) level with a 66 (100) kt-MW-CY far detector exposure, and has the ability to make strong statements at significantly shorter exposures depending on the true value of other oscillation parameters, with a median sensitivity of 3σ for almost all true δCP values after only 24 kt-MW-CY. We also show that DUNE has the potential to make a robust measurement of CPV at a 3σ level with a 100 kt-MW-CY exposure for the maximally CP-violating values δCP=±π/2. Additionally, the dependence of DUNE’s sensitivity on the exposure taken in neutrino-enhanced and antineutrino-enhanced running is discussed. An equal fraction of exposure taken in each beam mode is found to be close to optimal when considered over the entire space of interest.