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Measurement of the diffuse astrophysical neutrino flux over six seasons using cascade events from the Baikal-GVD expanding telescope

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arxiv 2507.01893 v2 pith:AJU2Z6GL submitted 2025-07-02 astro-ph.HE

Baikal-GVD Collaboration: V.A. Allakhverdyan , A.D. Avrorin , A.V. Avrorin , V.M. Aynutdinov , Z. Beňušová , I.A. Belolaptikov , E.A. Bondarev , I.V. Borina
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N.M. Budnev V.A. Chadymov A.S. Chepurnov V.Y. Dik A.N. Dmitrieva G.V. Domogatsky A.A. Doroshenko R. Dvornický A.N. Dyachok Zh.-A.M. Dzhilkibaev E. Eckerová T.V. Elzhov V.N. Fomin A.R. Gafarov K.V. Golubkov T.I. Gress K.G. Kebkal V.K. Kebkal I.V. Kharuk S.S. Khokhlov E.V. Khramov M.M. Kolbin S.O. Koligaev K.V. Konischev A.V. Korobchenko A.P. Koshechkin V.A. Kozhin M.V. Kruglov V.F. Kulepov A.A. Kulikov Y.E. Lemeshev M.V. Lisitsin S.V. Lovtsov R.R. Mirgazov D.V. Naumov A.S. Nikolaev I.A. Perevalova A.A. Petrukhin D.P. Petukhov E.N. Pliskovsky M.I. Rozanov E.V. Ryabov G.B. Safronov B.A. Shaybonov V.Y. Shishkin E.V. Shirokov F. Šimkovic A.E. Sirenko A.V. Skurikhin A.G. Solovjev M.N. Sorokovikov I. Štekl A.P. Stromakov O.V. Suvorova V.A. Tabolenko V.I. Tretjak B.B. Ulzutuev Y.V. Yablokova D.N. Zaborov S.I. Zavjalov D.Y. Zvezdov
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keywords fluxneutrinoastrophysicaltextdiffuseastrobaikal-gvdcascade
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abstract

We present an updated measurement of the diffuse astrophysical neutrino flux using Baikal-GVD cascade data collected between April 2018 to March 2024. In this period, the detector grew from 15% to 55% of its baseline cubic kilometer configuration. The diffuse astrophysical neutrino flux is detected with a statistical significance of 5.1 $\sigma$. Assuming a single power law model of the astrophysical neutrino flux with identical contribution from each neutrino flavor, the following best-fit parameter values are found: the spectral index $\gamma_{astro}$ = 2.64$^{+0.09}_{-0.11}$ and the flux normalization $\phi_{astro}$ = 4.42$^{+2.31}_{-1.29}\times10^{-18} \text{GeV}^{-1}\text{cm}^{-2}\text{s}^{-1}\text{sr}^{-1}$ per one flavor at 100 TeV. These results are broadly consistent with IceCube measurements.

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Cited by 3 Pith papers

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  1. Improving Neutrino Point Source Sensitivity with Source-Informed Event Selection

    hep-ex 2026-04 conditional novelty 6.0 of 10

    Source-informed event selection in multi-level neutrino reconstruction improves median point source sensitivity by factors of ~2-3 over uniform subsampling.

  2. First constraints on point-like astrophysical sources using Baikal-GVD muon neutrino events

    astro-ph.HE 2026-03 accept novelty 6.0 of 10

    No significant point-source excesses appear in Baikal-GVD track data (2019–2024); 90% CL upper limits on 92 sources are competitive with ANTARES and KM3NeT, with a 2.7σ pre-trial excess near Westerlund 1.

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