Search for Low-energy Electron Antineutrinos in KamLAND Associated with Gravitational Wave Events

TL;DR

This study searched for MeV-scale electron antineutrinos in KamLAND coinciding with gravitational wave events but found no significant signals, setting upper limits on neutrino fluence during these events.

Contribution

First to perform a targeted search for low-energy electron antineutrinos associated with gravitational wave events using KamLAND data.

Findings

No significant coincident signals detected.

Established 90% C.L. upper limits on neutrino fluence.

Constrained models predicting neutrino emission from gravitational wave sources.

Abstract

We present the results of a search for MeV-scale electron antineutrino events in KamLAND in coincident with the 60 gravitational wave events/candidates reported by the LIGO/Virgo collaboration during their second and third observing runs. We find no significant coincident signals within a $\pm$ 500 s timing window from each gravitational wave and present 90% C.L. upper limits on the electron antineutrino fluence between $10^{8}$-$10^{13}\,{\mathrm cm^2}$ for neutrino energies in the energy range of 1.8-111 MeV.