Constraints on the diffuse flux of multi-PeV astrophysical neutrinos obtained with the Baikal Gigaton Volume Detector

TL;DR

This paper reports upper limits on multi-PeV astrophysical neutrino fluxes using the Baikal GVD, providing constraints on theoretical models and combining data from multiple neutrino observatories.

Contribution

It presents the first upper limits on high-energy neutrino fluxes from Baikal GVD and constrains cosmogenic neutrino scenarios with multi-detector data.

Findings

Set upper limits on neutrino flux in the 10^15.5 - 10^20 eV range.

Constrained several cosmogenic neutrino models.

Combined data from Baikal-GVD, KM3NeT, IceCube, and Auger.

Abstract

Various theoretical models predict cosmic neutrinos with multi-PeV energies. The recent detection of a ~10^17 eV neutrino in the KM3NeT experiment suggests that these energetic particles can be studied with present-day installations. Here, we present upper limits on the flux of astrophysical neutrinos with energies (10^15.5 - 10^20) eV obtained with the largest liquid-water neutrino telescope, Baikal Gigaton Volume Detector (GVD), operation using cascade-like events. We discuss astrophysical implications of these results and constrain several cosmogenic neutrino scenarios using a combination of Baikal-GVD, KM3NeT, IceCube and Auger data.