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Constraints on nonstandard neutrino interactions from the Borexino extended data set

V. Antonelli1, D. Basilico1, G. Bellini1, J. Benziger2, R. Biondi3,†, B. Caccianiga1, F. Calaprice1,*, A. Caminata5, A. Chepurnov6 et al. (The BOREXINO Collaboration)

A. Chepurnov6, D. D’Angelo1, A. Derbin7, A. Di Giacinto3, V. Di Marcello3, X. F. Ding4,‡, A. Di Ludovico3,4, L. Di Noto5, I. Drachnev7, D. Franco8, C. Galbiati4,9, C. Ghiano3, M. Giammarchi1, A. Goretti4, M. Gromov6,22, D. Guffanti10,§, Aldo Ianni3, Andrea Ianni4, A. Jany11, V. Kobychev12, G. Korga13,14, S. Kumaran15,16,∥, M. Laubenstein3, E. Litvinovich17,18, P. Lombardi1, I. Lomskaya7, L. Ludhova15,16,10,¶, I. Machulin17,18, J. Martyn10, E. Meroni1, L. Miramonti1, M. Misiaszek11, V. Muratova7, L. Oberauer19, V. Orekhov10, F. Ortica20, M. Pallavicini5, L. Pelicci1, Ö. Penek15,**, L. Pietrofaccia3, N. Pilipenko7, A. Pocar21, G. Raikov17, M. T. Ranalli3, G. Ranucci1, A. Razeto3, A. Re1, N. Rossi3, S. Schönert19, D. Semenov7, G. Settanta15,††, M. Skorokhvatov17,18, A. Singhal15,16,‡‡, O. Smirnov22, A. Sotnikov22, G. Sun25, R. Tartaglia3, G. Testera5, M. D. C. Torri1, E. Unzhakov7, A. Vishneva22, R. B. Vogelaar23, F. von Feilitzsch19, M. Wojcik11,*, M. Wurm10, S. Zavatarelli5, X. Zhou25, K. Zuber24, and G. Zuzel11 (The BOREXINO Collaboration)

  • 1Dipartimento di Fisica, Università degli Studi e INFN, 20133 Milan, Italy
  • 2Chemical Engineering Department, Princeton University, Princeton, New Jersey 08544, USA
  • 3INFN Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy
  • 4Physics Department, Princeton University, Princeton, New Jersey 08544, USA
  • 5Dipartimento di Fisica, Università degli Studi e INFN, 16146 Genova, Italy
  • 6Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia
  • 7St. Petersburg Nuclear Physics Institute NRC Kurchatov Institute, 188350 Gatchina, Russia
  • 8APC, Université de Paris Cité, CNRS, Astroparticule et Cosmologie, Paris F-75013, France
  • 9Gran Sasso Science Institute, 67100 L’Aquila, Italy
  • 10Institute of Physics and Excellence Cluster PRISMA+, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
  • 11M. Smoluchowski Institute of Physics, Jagiellonian University, 30348 Krakow, Poland
  • 12Institute for Nuclear Research of NASU, 03028 Kyiv, Ukraine
  • 13Department of Physics, Royal Holloway University of London, Egham, Surrey TW20 0EX, United Kingdom
  • 14Institute of Nuclear Research (Atomki), Debrecen, Hungary
  • 15Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
  • 16III. Physikalisches Institut B, RWTH Aachen University, 52062 Aachen, Germany
  • 17National Research Centre Kurchatov Institute, 123182 Moscow, Russia
  • 18National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409 Moscow, Russia
  • 19Physik-Department, Technische Universität München, 85748 Garching, Germany
  • 20Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi e INFN, 06123 Perugia, Italy
  • 21Amherst Center for Fundamental Interactions and Physics Department, University of Massachusetts, Amherst, Massachusetts 01003, USA
  • 22Joint Institute for Nuclear Research, 141980 Dubna, Russia
  • 23Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
  • 24TU Dresden, Dresden, Germany
  • 25School of Physics and Technology, Wuhan University, Wuhan, China

  • *Deceased.
  • †Present address: Gran Sasso Science Institute (GSSI), L’Aquila, Italy.
  • ‡Present address: IHEP Institute of High Energy Physics, 100049 Beijing, China.
  • §Present address: Dipartimento di Fisica, Università degli Studi e INFN Milano-Bicocca, 20126 Milan, Italy.
  • ∥Present address: Department of Physics and Astronomy, University of California, Irvine, California, USA.
  • Present address: GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
  • **Present address: Boston University, Department of Physics, 02215 Boston, Massachusetts, USA.
  • ††Present address: Istituto Superiore per la Protezione e la Ricerca Ambientale, 00144 Rome, Italy.
  • ‡‡Present address: WSS-Forschungszentrum catalaix, RWTH Aachen University, Worringerweg 2, 52074 Aachen.
  • §§Group Spokesperson: spokesperson-borex@lngs.infn.it
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Phys. Rev. D 114, 032011 – Published 24 August, 2026

DOI: https://doi.org/10.1103/2h89-y8wh

Abstract

Neutrino nonstandard interactions (NSI) constitute an active research field, as they are closely related to potential new physics associated with dark matter searches and exotic interactions arising from fundamental symmetry violations. The Borexino’s unprecedented sensitivity to solar neutrinos, derived from its low background and precision spectral measurements, enables stringent constraints on potential deviations from the standard three-flavor neutrino oscillation paradigm. This work presents an update on the analysis of flavor-diagonal NSI using the full Borexino Phase-III dataset, extending the study previously reported in Constraints on flavor-diagonal nonstandard neutrino interactions from Borexino Phase-II (JHEP 2020, 38). The updated analysis incorporates the extended temporal and statistical coverage of Phase-III. The results indicate improved sensitivity to the diagonal NSI parameters, with constraints exceeding those obtained in Phase-II. Furthermore, a more general analysis that includes all possible off-diagonal NSI terms is presented for the first time, providing a comprehensive exploration of the NSI parameter space associated with the flavors of the incoming and outgoing neutrinos. This work once again underlines the Borexino’s critical role in probing new physics scenarios and reinforces its legacy in neutrino research. Detailed comparisons with Phase-II results are discussed, along with implications for theoretical models of NSI.

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Phys. Rev. D 114, 032011– Published 24 August, 2026
  • Received 3 March 2026
  • Accepted 21 July 2026
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