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Diffuse neutrino flux measurements with the Baikal-GVD neutrino telescope

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arxiv 2211.09447 v1 pith:M7JUYSSO submitted 2022-11-17 astro-ph.HE

Baikal Collaboration: V. A. Allakhverdyan , A. D. Avrorin , A. V. Avrorin , V. M. Aynutdinov , Z. Bardačová , I. A. Belolaptikov , I. V. Borina , N. M. Budnev
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V. Y. Dik G. V. Domogatsky A. A. Doroshenko R. Dvornický A. N. Dyachok Zh.-A. M. Dzhilkibaev E. Eckerová T. V. Elzhov L. Fajt A. R. Gafarov K. V. Golubkov N. S. Gorshkov T. I. Gress K. G. Kebkal V. K. Kebkal A. Khatun E. V. Khramov M. M. Kolbin K. V. Konischev A. V. Korobchenko A. P. Koshechkin V. A. Kozhin M. V. Kruglov V. F. Kulepov Y. M. Malyshkin M. B. Milenin R. R. Mirgazov D. V. Naumov V. Nazari D. P. Petukhov E. N. Pliskovsky M. I. Rozanov V. D. Rushay E. V. Ryabov G. B. Safronov B. A. Shaybonov D. Seitova M. D. Shelepov 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 Y. V. Yablokova D. N. Zaborov
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keywords neutrinofluxbaikal-gvdcosmicdiffuseastroeventsexcess
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abstract

We report on the first observation of the diffuse cosmic neutrino flux with the Baikal-GVD neutrino telescope. Using cascade-like events collected by Baikal-GVD in 2018--2021, a significant excess of events over the expected atmospheric background is observed. This excess is consistent with the high-energy diffuse cosmic neutrino flux observed by IceCube. The null cosmic flux assumption is rejected with a significance of 3.05$\sigma$. 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 $\gamma_{astro}$ = $2.58^{+0.27}_{-0.33}$ and the flux normalization $\phi_{astro}$ = 3.04$^{+1.52}_{-1.21}$ per one flavor at 100 TeV.

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