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arXiv · 2603.02836

Complementarity between atmospheric and super-beam neutrinos at ESSnuSB

ESSnuSB·:·J. Aguilar·M. Anastasopoulos·D. Barčot·E. Baussan·A. K. Bhattacharyya·A. Bignami·M. Blennow·M. Bogomilov·B. Bolling·E. Bouquerel·F. Bramati·A. Branca·G. Brunetti·I. Bustinduy·C. J. Carlile·J. Cederkall·T. W. Choi·S. Choubey·P. Christiansen·M. Collins·E. Cristaldo Morales·P. Cupiał·D. D'Ago·H. Danared·J. P. A. M. de André·M. Dracos·I. Efthymiopoulos·T. Ekelöf·M. Eshraqi·G. Fanourakis·A. Farricker·E. Fasoula·T. Fukuda·N. Gazis·Th. Geralis·M. Ghosh·A. Giarnetti·G. Gokbulut·C. Hagner·L. Halić·M. Hooft·K. E. Iversen·N. Jachowicz·M. Jenssen·R. Johansson·E. Kasimi·A. Kayis Topaksu·B. Kildetoft·K. Kordas·B. Kovač·A. Leisos·A. Longhin·C. Maiano·S. Marangoni·J. G. Marcos·C. Marrelli·D. Meloni·M. Mezzetto·N. Milas·R. Moolya·J. L. Muñoz·K. Niewczas·M. Oglakci·T. Ohlsson·M. Olvegård·M. Pari·D. Patrzalek·G. Petkov·Ch. Petridou·P. Poussot·A. Psallidas·F. Pupilli·D. Saiang·D. Sampsonidis·A. Scanu·C. Schwab·F. Sordo·G. Stavropoulos·R. Tarkeshian·F. Terranova·T. Tolba·M. Topp-Mugglestone·E. Trachanas·R. Tsenov·A. Tsirigotis·S. E. Tzamarias·M. Vanderpoorten·G. Vankova-Kirilova·N. Vassilopoulos·S. Vihonen·J. Wurtz·V. Zeter·O. Zormpa
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Abstract

The ESSnuSB experiment aims to measure the leptonic CP phase $\delta_{CP}$ with an unprecedented resolution by probing neutrino oscillations at the second oscillation maximum. In the present work, the complementarity between the long-baseline neutrino program and atmospheric neutrinos is investigated for ESSnuSB. By simulating atmospheric neutrino events equivalent of 5.4 Mt$\cdot$year exposure, the resolution for $\delta_{\rm CP}^{}$ is found to improve from $7.5^\circ$ ($6.7^\circ$) to $7.1^\circ$ ($6.5^\circ$) at $1\sigma$~CL for $\delta_{\rm CP}^{} = -90^\circ$ ($+90^\circ$) with respect to super-beam neutrinos, resolving also the degeneracies arising from neutrino mass ordering. These findings highlight the synergies that exist between super-beam neutrinos and atmospheric neutrinos in ESSnuSB.

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ESSnuSB, :, J. Aguilar, M. Anastasopoulos, D. Barčot, E. Baussan, A. K. Bhattacharyya, A. Bignami, M. Blennow, M. Bogomilov, B. Bolling, E. Bouquerel, F. Bramati, A. Branca, G. Brunetti, I. Bustinduy, C. J. Carlile, J. Cederkall, T. W. Choi, S. Choubey, P. Christiansen, M. Collins, E. Cristaldo Morales, P. Cupiał, D. D'Ago, H. Danared, J. P. A. M. de André, M. Dracos, I. Efthymiopoulos, T. Ekelöf, M. Eshraqi, G. Fanourakis, A. Farricker, E. Fasoula, T. Fukuda, N. Gazis, Th. Geralis, M. Ghosh, A. Giarnetti, G. Gokbulut, C. Hagner, L. Halić, M. Hooft, K. E. Iversen, N. Jachowicz, M. Jenssen, R. Johansson, E. Kasimi, A. Kayis Topaksu, B. Kildetoft, K. Kordas, B. Kovač, A. Leisos, A. Longhin, C. Maiano, S. Marangoni, J. G. Marcos, C. Marrelli, D. Meloni, M. Mezzetto, N. Milas, R. Moolya, J. L. Muñoz, K. Niewczas, M. Oglakci, T. Ohlsson, M. Olvegård, M. Pari, D. Patrzalek, G. Petkov, Ch. Petridou, P. Poussot, A. Psallidas, F. Pupilli, D. Saiang, D. Sampsonidis, A. Scanu, C. Schwab, F. Sordo, G. Stavropoulos, R. Tarkeshian, F. Terranova, T. Tolba, M. Topp-Mugglestone, E. Trachanas, R. Tsenov, A. Tsirigotis, S. E. Tzamarias, M. Vanderpoorten, G. Vankova-Kirilova, N. Vassilopoulos, S. Vihonen, J. Wurtz, V. Zeter, O. Zormpa. 2026-03-03. Complementarity between atmospheric and super-beam neutrinos at ESSnuSB. https://arxiv.org/abs/2603.02836

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