Search for Neutrinos in Coincidence with Gravitational Wave Events from the LIGO-Virgo O3a Observing Run with the Super-Kamiokande Detector



Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Imaizumi, S, Kameda, J, Kanemura, Y, Kataoka, Y, Miki, S, Miura, M
et al (show 203 more authors) (2021) Search for Neutrinos in Coincidence with Gravitational Wave Events from the LIGO-Virgo O3a Observing Run with the Super-Kamiokande Detector. ASTROPHYSICAL JOURNAL, 918 (2). p. 78.

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Abstract

<jats:title>Abstract</jats:title> <jats:p>The Super-Kamiokande detector can be used to search for neutrinos in time coincidence with gravitational waves detected by the LIGO–Virgo Collaboration (LVC). Both low-energy (7–100 MeV) and high-energy (0.1–10<jats:sup>5</jats:sup> GeV) samples were analyzed in order to cover a very wide neutrino spectrum. Follow-ups of 36 (out of 39) gravitational waves reported in the GWTC-2 catalog were examined; no significant excess above the background was observed, with 10 (24) observed neutrinos compared with 4.8 (25.0) expected events in the high-energy (low-energy) samples. A statistical approach was used to compute the significance of potential coincidences. For each observation, <jats:italic>p</jats:italic>-values were estimated using neutrino direction and LVC sky map; the most significant event (GW190602_175927) is associated with a post-trial <jats:italic>p</jats:italic>-value of 7.8% (1.4<jats:italic>σ</jats:italic>). Additionally, flux limits were computed independently for each sample and by combining the samples. The energy emitted as neutrinos by the identified gravitational wave sources was constrained, both for given flavors and for all flavors assuming equipartition between the different flavors, independently for each trigger and by combining sources of the same nature.</jats:p>

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 07 Oct 2021 09:30
Last Modified: 18 Jan 2023 21:27
DOI: 10.3847/1538-4357/ac0d5a
Open Access URL: https://iopscience.iop.org/article/10.3847/1538-43...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3139597