Exploring atmospheric neutrino oscillations at ESSnuSB

arXiv - PHYS - High Energy Physics - Experiment Pub Date : 2024-07-31 DOI:arxiv-2407.21663

ESSnuSB, :, J. Aguilar, M. Anastasopoulos, 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, 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. Kildetof, K. Kordas, A. Leisos, M. Lindroos, A. Longhin, C. Maiano, S. Marangoni, C. Marrelli, D. Meloni, M. Mezzetto, N. Milas, J. 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, C. Schwab, F. Sordo, A. Sosa, G. Stavropoulos, R. Tarkeshian, F. Terranova, T. Tolba, E. Trachanas, R. Tsenov, A. Tsirigotis, S. E. Tzamarias, G. Vankova-Kirilova, N. Vassilopoulos, S. Vihonen, J. Wurtz, V. Zeter, O. Zormpa

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Abstract

This study provides an analysis of atmospheric neutrino oscillations at the ESSnuSB far detector facility. The prospects of the two cylindrical Water Cherenkov detectors with a total fiducial mass of 540 kt are investigated over 10 years of data taking in the standard three-flavor oscillation scenario. We present the confidence intervals for the determination of mass ordering, $\theta_{23}$ octant as well as for the precisions on $\sin^2\theta_{23}$ and $|\Delta m_{31}^2|$. It is shown that mass ordering can be resolved by $3\sigma$ CL ($5\sigma$ CL) after 4 years (10 years) regardless of the true neutrino mass ordering. Correspondingly, the wrong $\theta_{23}$ octant could be excluded by $3\sigma$ CL after 4 years (7 years) in the case where the true neutrino mass ordering is normal ordering (inverted ordering). The results presented in this work are complementary to the accelerator neutrino program in the ESSnuSB project.

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在 ESSnuSB 探索大气中微子振荡

本研究对ESSnuSB远探测器设施的大气中微子振荡进行了分析。在标准三味振荡情况下，研究了两个圆柱形水切伦科夫探测器的前景，这两个探测器的基准总质量为540 kt。我们给出了确定质量排序、$\theta_{23}$倍频以及$\sin^2\theta_{23}$和$|Delta m_{31}^2|$精度的置信区间。结果表明，无论真中微子质量排序如何，质量排序都可以在4年（10年）之后通过$3\sigma$ CL（$5\sigma$ CL）得到解决。相应地，在真中微子质量排序为正常排序（倒序）的情况下，4年（7年）后就可以通过$3\sigma$ CL排除错误的$theta_{23}$八分之一。这项工作所展示的结果是对ESSnuSB项目中加速器中微子计划的补充。

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arXiv - PHYS - High Energy Physics - Experiment

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