论文标题

通过Baikal-GVD中微子望远镜进行弥漫性中微子通量测量

Diffuse neutrino flux measurements with the Baikal-GVD neutrino telescope

论文作者

Baikal Collaboration, 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., Shaybonov, B. A., Seitova, D., 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.

论文摘要

我们报告了使用Baikal-GVD中微子望远镜对弥漫性宇宙中微子通量的首次观察。使用Baikal-GVD在2018--2021收集的类似级联的事件,观察到与预期的大气背景相比,大量事件过多。这种过量与IceCube观察到的高能弥漫性宇宙中微子通量一致。零宇宙通量假设被拒绝,其意义为3.05 $σ$。假设一个天体中微子通量的单一功率法律模型具有每个中微子风味的相同贡献,则发现以下最佳参数值:光谱索引$γ_{astro} $ = $ 2.58^{+0.27} {+0.27} _ { - 0.33} $ { - 0.33} $ and flux normolisization $ distriasation $ ϕ_} $ = alasto} $ = alasto} $ = alasto} $ = alasto} $ = altero} $ = altero} $} 3.04 $^{+1.52} _ { - 1.21} $每一种口味在100 tev。

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$σ$. 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 $γ_{astro}$ = $2.58^{+0.27}_{-0.33}$ and the flux normalization $ϕ_{astro}$ = 3.04$^{+1.52}_{-1.21}$ per one flavor at 100 TeV.

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