Indication of Electron Antineutrinos from the Diffuse Supernova Neutrino Background

We report an indication of $\barν_e$ from the diffuse supernova neutrino background (DSNB) based on a spectral fit analysis of a 5003.0-day dataset in Super-Kamiokande. Key improvements over previous searches include enhanced rejection of atmospheric $ν$ backgrounds, updated evaluations of systematic uncertainties, and a refined spectral fitting method. Using a representative DSNB model, the best-fit flux was determined to be $3.6^{+1.6}_{-1.5}~\mathrm{cm^{-2}\,s^{-1}}$ for $E_ν>13.3$~MeV, corresponding to a $2.6σ$ tension with a null hypothesis ($99.5\%$ C.L., one-sided). Similar significances were obtained with signal models of varying spectral shapes.

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Publication Details

Journal
arXiv (Cornell University)
Published
2026-10-26
DOI
https://doi.org/10.48550/arxiv.2610.35619
Primary Topic
Neutrino Physics Research
Type
preprint
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preprint

Indication of Electron Antineutrinos from the Diffuse Supernova Neutrino Background

B. Jargowsky, K. Ieki, L. Ludovici, Takuya Tomiya et al.
arXiv (Cornell University)
Neutrino Physics Research
preprint

Indication of Electron Antineutrinos from the Diffuse Supernova Neutrino Background

B. Jargowsky, K. Ieki, L. Ludovici, Takuya Tomiya, Y. Itow, R Shinoda, Lorenzo Périssé, Y. Hayato, K. Okumura, Th. A. Mueller, Y. Noguchi, M. Miura, R. Rogly, M. Shiozawa, R. P. Litchfield, Y. Asaoka, R. G. Park, G. De Rosa, M.G Catanesi, Lucas Nascimento Machado, G. Pronost, V. Berardi, J. Kameda, G. T. Burton, N. Jeff Griskevich, Nicola Fulvio Calabria, T. Wester, K. Nakagiri, S. Nakayama, A. Langella, A. Ershova, G. Collazuol, B. W. Pointon, N. Ospina, Y. Kataoka, P. Paganini, P. Fernandez, Henry W. Sobel, Nick W. Prouse, O. Drapier, L. Labarga, Chiaki Yanagisawa, J. Bian, T. Tashiro, Benjamin Quilain, E. Radicioni, T. Kajita, T. V. Ngoc, Y. Uchida, J. G. Learned, H. Sekiya, F. J. P. Soler, Volodymyr Takhistov, D Samudio, S. Cao, F. J. de Garay Arcones, Kamiokande Collaboration, E Kearns, L. Wan, J. Mirabito, M. Feltre, C. Quach, T. Leplumey, B. Cortez, M. Nakahata, M. Ikeda, S. Mine, M. B. Smy, R. Nishijima, M. Harada, S.J. Chen, M. Ferey, J.S. Jang, M. Scott, S. Moriyama, K. Scholberg, T.H. Hung, D. H. Moon, Y. Suzuki, M. Gonin, B. S. Yang, K. Abe, K. Hiraide, A. Chahlaoui, E. Le Blévec, C. W. Walter, M. Mattiazzi, Y. T. Jiang, L. H. V. Anthony, D. Jung, X. Q. Wang, K. Choi, H. Tanaka, B. D. Xu, T. Nakamura, A. Takeda, K. Sato, Y. Takemoto, J. Hill, Z. Hu
preprint en

Abstract

We report an indication of $\barν_e$ from the diffuse supernova neutrino background (DSNB) based on a spectral fit analysis of a 5003.0-day dataset in Super-Kamiokande. Key improvements over previous searches include enhanced rejection of atmospheric $ν$ backgrounds, updated evaluations of systematic uncertainties, and a refined spectral fitting method. Using a representative DSNB model, the best-fit flux was determined to be $3.6^{+1.6}_{-1.5}~\mathrm{cm^{-2}\,s^{-1}}$ for $E_ν>13.3$~MeV, corresponding to a $2.6σ$ tension with a null hypothesis ($99.5\%$ C.L., one-sided). Similar significances were obtained with signal models of varying spectral shapes.

arXiv (Cornell University)
Neutrino Physics Research
DOIOpen Access PDFOpenAlex
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