PreprintCC BY 4.0arXiv
Indication of Electron Antineutrinos from the Diffuse Supernova Neutrino Background
Abstract
We report an indication of ν̅e 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 cm−2 s−1 for Eν>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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BibTeX
@misc{collaboration2026indication,
title = {{Indication of Electron Antineutrinos from the Diffuse Supernova Neutrino Background}},
author = {Kamiokande Collaboration and K. Abe and Y. Asaoka and M. Harada and Y. Hayato and K. Hiraide and T. H. Hung and K. Ieki and M. Ikeda and J. Kameda and Y. Kataoka and S. Mine and M. Miura and S. Moriyama and K. Nakagiri and M. Nakahata and S. Nakayama and Y. Noguchi and G. Pronost and K. Sato and H. Sekiya and R. Shinoda and M. Shiozawa and Y. Suzuki and A. Takeda and Y. Takemoto and H. Tanaka and S. Chen and Y. Itow and T. Kajita and R. Nishijima and K. Okumura and T. Tashiro and T. Tomiya and X. Wang and F. J. de Garay Arcones and P. Fernandez and L. Labarga and D. Samudio and C. Yanagisawa and B. Jargowsky and E. Kearns and J. Mirabito and L. Wan and T. Wester and B. W. Pointon and J. Bian and B. Cortez and N. J. Griskevich and Y. Jiang and M. B. Smy and H. W. Sobel and V. Takhistov and J. Hill and B. D. Xu and D. Jung and D. H. Moon and R. G. Park and B. S. Yang and K. Scholberg},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.35619},
eprint = {2610.35619},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.35619},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Indication of Electron Antineutrinos from the Diffuse Supernova Neutrino Background
AU - Kamiokande Collaboration
AU - K. Abe
AU - Y. Asaoka
AU - M. Harada
AU - Y. Hayato
AU - K. Hiraide
AU - T. H. Hung
AU - K. Ieki
AU - M. Ikeda
AU - J. Kameda
AU - Y. Kataoka
AU - S. Mine
AU - M. Miura
AU - S. Moriyama
AU - K. Nakagiri
AU - M. Nakahata
AU - S. Nakayama
AU - Y. Noguchi
AU - G. Pronost
AU - K. Sato
AU - H. Sekiya
AU - R. Shinoda
AU - M. Shiozawa
AU - Y. Suzuki
AU - A. Takeda
AU - Y. Takemoto
AU - H. Tanaka
AU - S. Chen
AU - Y. Itow
AU - T. Kajita
AU - R. Nishijima
AU - K. Okumura
AU - T. Tashiro
AU - T. Tomiya
AU - X. Wang
AU - F. J. de Garay Arcones
AU - P. Fernandez
AU - L. Labarga
AU - D. Samudio
AU - C. Yanagisawa
AU - B. Jargowsky
AU - E. Kearns
AU - J. Mirabito
AU - L. Wan
AU - T. Wester
AU - B. W. Pointon
AU - J. Bian
AU - B. Cortez
AU - N. J. Griskevich
AU - Y. Jiang
AU - M. B. Smy
AU - H. W. Sobel
AU - V. Takhistov
AU - J. Hill
AU - B. D. Xu
AU - D. Jung
AU - D. H. Moon
AU - R. G. Park
AU - B. S. Yang
AU - K. Scholberg
PY - 2026
DA - 2026/10/26
PB - arXiv
DO - 10.48550/arxiv.2610.35619
UR - https://arxiv.org/abs/2610.35619
AB - We report an indication of ν̅_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 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.
ER -