Methods for the suppression of background cascades produced along atmospheric muon tracks in Baikal-GVD

Discussion timeslot (ZOOM-Meeting): 16. July 2021 - 12:00
ZOOM-Meeting URL: https://desy.zoom.us/j/91999581729
ZOOM-Meeting ID: 91999581729
ZOOM-Meeting Passcode: ICRC2021
Corresponding Session: https://icrc2021-venue.desy.de/channel/36-Shower-Reconstruction-and-Pointing-NU/121
Live-Stream URL: https://icrc2021-venue.desy.de/livestream/Discussion-05/6

Abstract:
'The Baikal-GVD detector (Gigaton Volume Detector) is a large-scale neutrino telescope located at a depth of 1366 metres in Lake Baikal. One of its main purposes is to identify high-energy extraterrestrial neutrinos and to locate their sources on the sky. In recent (year 2020), it is a three dimensional array of 2016 optical modules (OMs), sub-arranged into 7 functionally independent units called clusters. rnrnCharged-current interactions of electron neutrino and neutral-current interactions of all three neutrino flavours create a unique light signature of a single “cascade” in the detector. However, cascade pattern can also be produced by discrete stochastic energy losses along the atmospheric muon tracks. These constitute an avoidable background in the search of astrophysical neutrinos. Therefore, different kinds of data analysis methods for the suppression of background events have been developed.rnrnThe suppression is achieved by means of the time and charge information of signals detected at the OMs. One of the method tries to find the maximum number of track hits amongst cascade hits, which are present in the muon bundle event. Other techniques rely on the distributions of hits charges and positions of hit OMs associated with cascade events. All suppression tools were developed and optimized on the Monte Carlo simulation datasets.'

Authors: Zuzana Bardačová | For the Baikal Collaboration
Collaboration: Baikal Collaboration

Indico-ID: 431
Proceeding URL: https://pos.sissa.it/395/1114