Abstract
In this paper, we present the physics performance of the ESSnuSB experiment in the standard three flavor scenario using the updated neutrino flux calculated specifically for the ESSnuSB configuration and updated migration matrices for the far detector. Taking conservative systematic uncertainties corresponding to a normalization error of 5% for signal and 10% for background, we find that there is 10sigma (13sigma ) CP violation discovery sensitivity for the baseline option of 540 km (360 km) at delta _mathrm{CP} = pm 90^circ . The corresponding fraction of delta _mathrm{CP} for which CP violation can be discovered at more than 5 sigma is 70%. Regarding CP precision measurements, the 1sigma error associated with delta _mathrm{CP} = 0^circ is around 5^circ and with delta _mathrm{CP} = -90^circ is around 14^circ (7^circ ) for the baseline option of 540 km (360 km). For hierarchy sensitivity, one can have 3sigma sensitivity for 540 km baseline except delta _mathrm{CP} = pm 90^circ and 5sigma sensitivity for 360 km baseline for all values of delta _mathrm{CP}. The octant of theta _{23} can be determined at 3 sigma for the values of: theta _{23} > 51^circ (theta _{23} < 42^circ and theta _{23} > 49^circ ) for baseline of 540 km (360 km). Regarding measurement precision of the atmospheric mixing parameters, the allowed values at 3 sigma are: 40^circ< theta _{23} < 52^circ (42^circ< theta _{23} < 51.5^circ ) and 2.485 times 10^{-3} eV^2< varDelta m^2_{31} < 2.545 times 10^{-3} eV^2 (2.49 times 10^{-3} eV^2< varDelta m^2_{31} < 2.54 times 10^{-3} eV^2) for the baseline of 540 km (360 km).
Highlights
The European Spallation Source neutrino Super-Beam (ESSnuSB) is a proposed accelerator-based long-baseline neutrino experiment in Sweden [1,2]
As the variation of neutrino oscillation probability with respect to δCP is much higher in the second oscillation maximum as compared to the first oscillation maximum [3–5], ESSnuSB as a second generation super-beam experiment has the potential of measuring δCP with unprecedented precision compared to the first generation long-baseline experiments
The neutrino fluxes used in this work have been calculated by considering a new target and horn focusing, whose design has been optimized by using genetic algorithm calculations [18]
Summary
The European Spallation Source neutrino Super-Beam (ESSnuSB) is a proposed accelerator-based long-baseline neutrino experiment in Sweden [1,2]. It is believed that these two experiments will give a hint towards the true nature of the unknown oscillation parameters and the future generation of long-baseline experiments for example ESSnuSB, T2HK [8] and DUNE [9] will establish these facts with significant confidence level. Considering the branch for δCP as −180◦ ≤ δCP ≤ 180◦, T2K supports the best-fit value of δCP around −90◦ i.e., the maximal CP violating value and the best-fit value measured by NOνA is around 0◦ i.e., the CP conserving value Because of this the best-fit value of δCP coming from the global analysis of the world neutrino data is −163◦ [10].
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