Diffuse neutrino flux measurements with the Baikal-GVD neutrino telescope
Allakhverdyan V.A. Avrorin A.D. Avrorin A.V. Aynutdinov V.M. Bardačová Z. Belolaptikov I.A. Borina I.V. Budnev N.M. Dik V.Y. Domogatsky G.V. Doroshenko A.A. Dvornický R. Dyachok A.N. Dzhilkibaev Zh.-A.M. Eckerová E. Elzhov T.V. Fajt L. Gafarov A.R. Golubkov K.V. Gorshkov N.S. Gress T.I. Kebkal K.G. Kebkal V.K. Khatun A. Khramov E.V. Kolbin M.M. Konischev K.V. Korobchenko A.V. Koshechkin A.P. Kozhin V.A. Kruglov M.V. Kulepov V.F. Malyshkin Y.M. Milenin M.B. Mirgazov R.R. Naumov D.V. Nazari V. Petukhov D.P. Pliskovsky E.N. Rozanov M.I. Rushay V.D. Ryabov E.V. Safronov G.B. Seitova D. Shaybonov B.A. Shelepov M.D. Šimkovic F. Sirenko A.E. Skurikhin A.V. Solovjev A.G. Sorokovikov M.N. Štekl I. Stromakov A.P. Suvorova O.V. Tabolenko V.A. Yablokova Y.V. Zaborov D.N.
15 February 2023American Physical Society
Physical Review D
2023#107Issue 4
We report on the first observation of the diffuse cosmic neutrino flux with the Baikal-GVD neutrino telescope. Using cascadelike 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 3.05σ. 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 γastro=2.58-0.33+0.27 and the flux normalization φastro=3.04-1.21+1.52 per one flavor at 100 TeV.
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Joint Institute for Nuclear Research, Dubna, 141980, Russian Federation
Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, 117312, Russian Federation
Comenius University, Bratislava, 81499, Slovakia
Irkutsk State University, Irkutsk, 664003, Russian Federation
Institute of Nuclear Physics ME RK, Almaty, 050032, Kazakhstan
Czech Technical University, Institute of Experimental and Applied Physics, Prague, CZ-11000, Czech Republic
EvoLogics GmbH, Berlin, 13355, Germany
Skobeltsyn Research Institute of Nuclear Physics, Moscow State University, Moscow, 119991, Russian Federation
Nizhny Novgorod State Technical University, Nizhny Novgorod, 603950, Russian Federation
Saint Petersburg State Marine Technical University, Saint Petersburg, 190008, Russian Federation
Joint Institute for Nuclear Research
Institute for Nuclear Research of the Russian Academy of Sciences
Comenius University
Irkutsk State University
Institute of Nuclear Physics ME RK
Czech Technical University
EvoLogics GmbH
Skobeltsyn Research Institute of Nuclear Physics
Nizhny Novgorod State Technical University
Saint Petersburg State Marine Technical University
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