Abstract
The main aim of the ESSνSB proposal is the discovery of the leptonic CP phase δCP with a high significance (5σ for 50% values of δCP) by utilizing the physics at the second oscillation maxima of the Pμe channel. It can achieve 3σ sensitivity to hierarchy for all values of δCP. In this work, we concentrate on the hierarchy and octant sensitivity of the ESSνSB experiment. We show that combining the ESSνSB experiment with the atmospheric neutrino data from the proposed India-based Neutrino Observatory (INO) experiment can result in an increased sensitivity to mass hierarchy. In addition, we also combine the results from the ongoing experiments T2K and NOνa assuming their full run-time and present the combined sensitivity of ESSνSB + ICAL@INO + T2K + NOνA. We show that while by itself ESSνSB can have up to 3σ hierarchy sensitivity, the combination of all the experiments can give up to 5σ sensitivity depending on the true hierarchy-octant combination. The octant sensitivity of ESSνSB is low by itself. However the combined sensitivity of all the above experiments can give up to 3σ sensitivity depending on the choice of true hierarchy and octant. We discuss the various degeneracies and the synergies that lead to the enhanced sensitivity when combining different experimental data.
Highlights
JHEP05(2019)137 a set-up the hierarchy and octant sensitivity gets compromised as compared to the first oscillation maximum
We show that combining the ESSνSB experiment with the atmospheric neutrino data from the proposed India-based Neutrino Observatory(INO) experiment can result in an increased sensitivity to mass hierarchy
We show how the hierarchy sensitivity of the ESSνSB experiment can be enhanced by combining with the atmospheric neutrino data at the proposed Iron Calorimeter (ICAL) detector of the ICAL@INO collaboration as well as the data from the ongoing T2K and NOνA experiments assuming their full projected runs
Summary
JHEP05(2019)137 a set-up the hierarchy and octant sensitivity gets compromised as compared to the first oscillation maximum. In this study our aim is to explore whether the hierarchy and octant sensitivity of ESSνSB can be improved by combining with the proposed atmospheric neutrino experiment ICAL@INO [25]. We discuss briefly the behavior of the probability for baselines and energies for which resonance matter effect occurs for atmospheric neutrinos passing through the earth. For the accelerator based experiments T2K, NOνA, ESSνSB the relevant channel for mass hierarchy and octant sensitivity is the appearance channel governed by the probability. In presence of matter of constant density, this can be expanded in terms of the small parameters α
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