Updated physics performance of the ESSnuSB experiment: ESSnuSB collaboration

• Published in: The European physical journal. C, Particles and fields Particles and fields, 2021-12, Vol.81 (12), Article 1130
• Main Authors: Alekou, A., Baussan, E., Blaskovic Kraljevic, N., Blennow, M., Bogomilov, M., Bouquerel, E., Burgman, A., Carlile, C. J., Cederkall, J., Christiansen, P., Collins, M., Cristaldo Morales, E., D’Alessi, L., Danared, H., de André, J. P. A. M., Delahaye, J. P., Dracos, M., Efthymiopoulos, I., Ekelöf, T., Eshraqi, M., Fanourakis, G., Fernandez-Martinez, E., Folsom, B., Ghosh, M., Gokbulut, G., Halić, L., Kayis Topaksu, A., Kliček, B., Krhač, K., Lindroos, M., Mezzetto, M., Oglakci, M., Ohlsson, T., Olvegård, M., Ota, T., Park, J., Petkov, G., Poussot, P., Rosauro-Alcaraz, S., Stavropoulos, G., Stipčević, M., Terranova, F., Thomas, J., Tolba, T., Tsenov, R., Vankova-Kirilova, G., Vassilopoulos, N., Wildner, E., Wurtz, J., Zormpa, O., Zou, Y.
• Format: Article
• Language: English
• Subjects: Astronomy; Astrophysics and Cosmology; Elementary Particles; Hadrons; Heavy Ions; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Regular Article - Theoretical Physics; String Theory
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-021-09845-8

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 10 σ ( 13 σ ) CP violation discovery sensitivity for the baseline option of 540 km (360 km) at δ CP = ± 90 ∘ . The corresponding fraction of δ CP for which CP violation can be discovered at more than 5 σ is 70 % . Regarding CP precision measurements, the 1 σ error associated with δ CP = 0 ∘ is around 5 ∘ and with δ CP = - 90 ∘ is around 14 ∘ ( 7 ∘ ) for the baseline option of 540 km (360 km). For hierarchy sensitivity, one can have 3 σ sensitivity for 540 km baseline except δ CP = ± 90 ∘ and 5 σ sensitivity for 360 km baseline for all values of δ CP . The octant of θ 23 can be determined at 3 σ for the values of: θ 23 > 51 ∘ ( θ 23 < 42 ∘ and θ 23 > 49 ∘ ) for baseline of 540 km (360 km). Regarding measurement precision of the atmospheric mixing parameters, the allowed values at 3 σ are: 40 ∘ < θ 23 < 52 ∘ ( 42 ∘ < θ 23 < 51 . 5 ∘ ) and 2.485 × 10 - 3 eV 2 < Δ m 31 2 < 2.545 × 10 - 3 eV 2 ( 2.49 × 10 - 3 eV 2 < Δ m 31 2 < 2.54 × 10 - 3 eV 2 ) for the baseline of 540 km (360 km).