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Signatures of supermassive charged gravitinos in liquid scintillator detectors

Adrianna Kruk1, Michał Lesiuk1, Krzysztof A. Meissner2, and Hermann Nicolai3

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Phys. Rev. Research 7, 033145 – Published 13 August, 2025

DOI: https://doi.org/10.1103/fm6h-7r78

Abstract

In a previous work [K. A. Meissner and H. Nicolai, Eur. Phys. J. C 84, 269 (2024)], two of the present authors have suggested possible experimental ways to search for stable supermassive particles with electric charges of O(1) in upcoming underground experiments, in particular the new Jiangmen Underground Neutrino Observatory (JUNO) experiment. In this paper, we present a detailed analysis of the specific signature of such gravitino-induced events for the JUNO detector and for upcoming liquid argon detectors like DUNE (Deep Underground Neutrino Experiment). The proposed method of detection relies on the “glow” produced by photons during the passage of such particles through the detector liquid, which would last for about a few to a few hundred microseconds depending on its velocity and the track. The cross sections for electronic excitation of the main component of the scintillator liquid, namely, linear alkylbenzene, by the passing gravitino are evaluated using quantum-chemical methods. The results show that, if such particles exist, the resulting signals would lead to a unique and unmistakable signature, for which we present event simulations as they would be seen by the JUNO or DUNE photomultipliers. Our analysis brings together two very different research areas, namely, fundamental particles physics and the search for a fundamental theory on the one hand, and methods of advanced quantum chemistry on the other.

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Phys. Rev. Research 7, 033145– Published 13 August, 2025
  • Received 30 July 2024
  • Accepted 2 May 2025
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