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arXiv · 2604.06002

Probing the Solar $^8$B Neutrino Fog with XENONnT

E. Aprile·J. Aalbers·K. Abe·M. M. Abu Rmeileh·M. Adrover·S. Ahmed Maouloud·L. Althueser·B. Andrieu·E. Angelino·D. Antón Martin·S. R. Armbruster·F. Arneodo·L. Baudis·M. Bazyk·V. Beligotti·L. Bellagamba·R. Biondi·A. Bismark·K. Boese·R. M. Braun·G. Bruni·R. Budnik·C. Cai·C. Capelli·J. M. R. Cardoso·A. P. Cimental Chávez·A. P. Colijn·J. Conrad·J. J. Cuenca-García·V. D'Andrea·L. C. Daniel Garcia·M. P. Decowski·A. Deisting·C. Di Donato·P. Di Gangi·S. Diglio·K. Eitel·S. el Morabit·R. Elleboro·A. Elykov·A. D. Ferella·C. Ferrari·H. Fischer·T. Flehmke·M. Flierman·R. Frankel·D. Fuchs·W. Fulgione·C. Fuselli·F. Gao·R. Giacomobono·F. Girard·R. Glade-Beucke·L. Grandi·J. Grigat·H. Guan·M. Guida·P. Gyorgy·R. Hammann·C. Hils·L. Hoetzsch·N. F. Hood·M. Iacovacci·Y. Itow·J. Jakob·F. Joerg·Y. Kaminaga·M. Kara·S. Kazama·P. Kharbanda·M. Kobayashi·D. Koke·K. Kooshkjalali·A. Kopec·E Kozlova·H. Landsman·R. F. Lang·L. Levinson·A. Li·H. Li·I. Li·S. Li·S. Liang·Z. Liang·Y. -T. Lin·S. Lindemann·M. Lindner·K. Liu·M. Liu·F. Lombardi·J. A. M. Lopes·G. M. Lucchetti·T. Luce·Y. Ma·C. Macolino·G. C. Madduri·J. Mahlstedt·F. Marignetti·T. Marrodán Undagoitia·K. Martens
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Abstract

We report a 3.3 $\sigma$ measurement of coherent elastic neutrino-nucleus scattering from solar $^8$B neutrinos using a 6.77 t$\times$yr exposure from the XENONnT experiment, inferring a solar $^8$B neutrino flux of $(5_{-2}^{+3})\times 10^6\,\mathrm{cm}^{-2}\mathrm{s}^{-1}$, consistent with previous measurements. In the presence of the $^8$B "neutrino fog", we find no evidence for light dark matter, and observe diminishing returns in sensitivity with increasing exposure. A 93% increase in exposure from the previous search improves the median sensitivity to the nucleon scattering cross section for a 5 GeV/$c^2$ spin-independent weakly interacting massive particle by 10%. The dataset was also used to measure the weak mixing angle at $\sim$ 0.02 GeV/$c$ momentum transfer and constrain physics beyond the Standard Model.

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E. Aprile, J. Aalbers, K. Abe, M. M. Abu Rmeileh, M. Adrover, S. Ahmed Maouloud, L. Althueser, B. Andrieu, E. Angelino, D. Antón Martin, S. R. Armbruster, F. Arneodo, L. Baudis, M. Bazyk, V. Beligotti, L. Bellagamba, R. Biondi, A. Bismark, K. Boese, R. M. Braun, G. Bruni, R. Budnik, C. Cai, C. Capelli, J. M. R. Cardoso, A. P. Cimental Chávez, A. P. Colijn, J. Conrad, J. J. Cuenca-García, V. D'Andrea, L. C. Daniel Garcia, M. P. Decowski, A. Deisting, C. Di Donato, P. Di Gangi, S. Diglio, K. Eitel, S. el Morabit, R. Elleboro, A. Elykov, A. D. Ferella, C. Ferrari, H. Fischer, T. Flehmke, M. Flierman, R. Frankel, D. Fuchs, W. Fulgione, C. Fuselli, F. Gao, R. Giacomobono, F. Girard, R. Glade-Beucke, L. Grandi, J. Grigat, H. Guan, M. Guida, P. Gyorgy, R. Hammann, C. Hils, L. Hoetzsch, N. F. Hood, M. Iacovacci, Y. Itow, J. Jakob, F. Joerg, Y. Kaminaga, M. Kara, S. Kazama, P. Kharbanda, M. Kobayashi, D. Koke, K. Kooshkjalali, A. Kopec, E Kozlova, H. Landsman, R. F. Lang, L. Levinson, A. Li, H. Li, I. Li, S. Li, S. Liang, Z. Liang, Y. -T. Lin, S. Lindemann, M. Lindner, K. Liu, M. Liu, F. Lombardi, J. A. M. Lopes, G. M. Lucchetti, T. Luce, Y. Ma, C. Macolino, G. C. Madduri, J. Mahlstedt, F. Marignetti, T. Marrodán Undagoitia, K. Martens. 2026-04-07. Probing the Solar $^8$B Neutrino Fog with XENONnT. https://doi.org/10.1103/xvpn-w3q9

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