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Searches for new physics below twice the electron mass with GERDA

Agostini, M; Alexander, A; Araujo, G; Bakalyarov, AM; Balata, M; Barabanov, I; Baudis, L; ... Wester, T; + view all (2024) Searches for new physics below twice the electron mass with GERDA. European Physical Journal C , 84 (9) , Article 940. 10.1140/epjc/s10052-024-13020-0. Green open access

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Abstract

A search for full energy depositions from bosonic keV-scale dark matter candidates of masses between 65 and 1021 keV has been performed with data collected during Phase II of the GERmanium Detector Array (Gerda) experiment. Our analysis includes direct dark matter absorption as well as dark Compton scattering. With a total exposure of 105.5 kg years, no evidence for a signal above the background has been observed. The resulting exclusion limits deduced with either Bayesian or Frequentist statistics are the most stringent direct constraints in the major part of the 140–1021 keV mass range. As an example, at a mass of 150 keV the dimensionless coupling of dark photons and axion-like particles to electrons has been constrained to α′/α<8.7×10-24 and gae<3.3×10-12 at 90% credible interval (CI), respectively. Additionally, a search for peak-like signals from beyond the Standard Model decays of nucleons and electrons is performed. We find for the inclusive decay of a single neutron in 76Ge a lower lifetime limit of τn>1.5×1024 years and for a proton τp>1.3×1024 years at 90% CI. For the electron decay e-→νeγ a lower limit of τe>5.4×1025 years at 90% CI has been determined.

Type: Article
Title: Searches for new physics below twice the electron mass with GERDA
Location: France
Open access status: An open access version is available from UCL Discovery
DOI: 10.1140/epjc/s10052-024-13020-0
Publisher version: http://dx.doi.org/10.1140/epjc/s10052-024-13020-0
Language: English
Additional information: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Keywords: GERDA Collaboration
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10199045
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