Observations of track-like neutrino events with Baikal-GVD

TL;DR

This paper reports the detection of upward-going neutrino events with Baikal-GVD, demonstrating the detector's capability to observe neutrinos and confirming consistency with theoretical predictions.

Contribution

First observations of track-like neutrino events with Baikal-GVD, showcasing its potential for neutrino astronomy and validation of detection techniques.

Findings

Detection of upward-going neutrino events after background suppression

Observed neutrino flux agrees with Monte Carlo simulations

Demonstrated detector's capability with partial array data

Abstract

The Baikal Gigaton Volume Detector (Baikal-GVD) is a km$^3$-scale neutrino detector currently under construction in Lake Baikal, Russia. The detector currently consists of 2304 optical modules arranged on 64 vertical strings. Further extension of the array is planned for March 2022. The data from the partially complete array have been analyzed using a $\chi^2$-based track reconstruction algorithm. After suppression of the downward-going atmospheric muon background, a flux of upward-going neutrino events is observed, dominated by the atmospheric neutrinos. The observed flux is in good agreement with Monte Carlo predictions.