Enhancing the hierarchy and octant sensitivity of ESS$\nu$SB in conjunction with T2K, NO$\nu$A and ICAL@INO

Abstract

The main aim of the ESS$\nu$SB proposal is the discovery of the leptonic CP phase ${\delta }_{CP}$ with a high significance ($5\sigma$ for 50% values of ${\delta }_{CP}$) by utilizing the physics at the second oscillation maxima of the $P_{\mu e}$ channel. It can achieve $3\sigma$ sensitivity to hierarchy for all values of ${\delta }_{CP}$. In this work, we concentrate on the hierarchy and octant sensitivity of the ESS$\nu$SB experiment. We show that combining the ESS$\nu$SB 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 NO$\nu$A assuming their full runtime and present the combined sensitivity of ESS$\nu$SB + ICAL@INO + T2K + NO$\nu$A. We show that while by itself ESS$\nu$SB can have up to $3\sigma$ hierarchy sensitivity, the combination of all the experiments can give up to $5\sigma$ sensitivity depending on the true hierarchy-octant combination. The octant sensitivity of ESS$\nu$SB is low by itself. However the combined sensitivity of all the above experiments can give up to $3\sigma$ 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.

7 figures, 4 tables, minor typos corrected, updated to the published version

References in corpus (10)

• New features in the simulation of neutrino oscillation experiments with GLoBES 3.0
• Updated fit to three neutrino mixing: exploring the accelerator-reactor complementarity
• Potential of optimized NOvA for large theta(13) & combined performance with a LArTPC & T2K
• A Simulations Study of the Muon Response of the Iron Calorimeter Detector at the India-based Neutrino Observatory
• Enhancing sensitivity to neutrino parameters at INO combining muon and hadron information
• Neutrino oscillation probabilities through the looking glass
• Probing Neutrino Oscillation Parameters using High Power Superbeam from ESS
• Determining the Octant of ${\theta }_{23}$ at LBNE in conjunction with Reactor Experiments
• A hybrid setup for fundamental unknowns in neutrino oscillations using T2HK ($\nu$) and $\mu$-DAR ($\bar{\nu }$)
• Revisiting the sensitivity studies for leptonic CP violation and mass hierarchy with T2K, NOvA and LBNE experiments