Abstract
The deep underground neutrino experiment (DUNE) is a proposed next generation superbeam experiment at Fermilab. Its aims include measuring the unknown neutrino oscillation parameters—the neutrino mass hierarchy, the octant of the mixing angle $$\theta _{23}$$ , and the CP-violating phase $$\delta _\mathrm{{CP}}$$ . The current and upcoming experiments T2K, NO $$\nu $$ A, and ICAL@INO will also be collecting data for the same measurements. In this paper, we explore the sensitivity reach of DUNE in combination with these other experiments. We evaluate the least exposure required by DUNE to determine the above three unknown parameters with reasonable confidence. We find that for each case, the inclusion of data from T2K, NO $$\nu $$ A, and ICAL@INO help to achieve the same sensitivity with a reduced exposure from DUNE thereby helping to economize the configuration. Further, we quantify the effect of the proposed near detector on systematic errors and study the consequent improvement in sensitivity. We also examine the role played by the second oscillation cycle in furthering the physics reach of DUNE. Finally, we present an optimization study of the neutrino–antineutrino running of DUNE.
Highlights
The flavor mixing of neutrinos leading to neutrino oscillations was confirmed by the Super-Kamiokande experiment [1], more than a decade ago
The current and upcoming experiments T2K, NOνA, and ICAL@INO will provide some indications for the values of the unknown parameters
We have evaluated the adequate exposure for deep underground neutrino experiment (DUNE), i.e. the minimum exposure for DUNE to determine the unknown parameters in combination with the other experiments, for all values of the oscillation parameters
Summary
The flavor mixing of neutrinos leading to neutrino oscillations was confirmed by the Super-Kamiokande experiment [1], more than a decade ago. The primary task before the current and generation of neutrino oscillation experiments is to measure the unknown parameters (mass hierarchy, octant of θ23, and δCP) and to put more precise constraints on the values of the known ones. These can be achieved by experiments that probe the νμ → νe and νμ → νμ oscillation channels at scales relevant to the atmospheric mass-squared difference. We determine the most conservative specifications that this experiment needs, in order to measure the remaining unknown parameters to a specified level of precision This early physics reach of DUNE can be taken as the aim of the first stage, if the experiment is conducted in a staged approach.
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