@article{642f376786a94ed89958a806fb7f90a5,
title = "Signal processing and spectral modeling for the BeEST experiment",
abstract = "The Beryllium Electron capture in Superconducting Tunnel junctions (BeEST) experiment searches for evidence of heavy neutrino mass eigenstates in the nuclear electron capture decay of Be7 by precisely measuring the recoil energy of the Li7 daughter. In Phase III, the BeEST experiment has been scaled from a single superconducting tunnel junction (STJ) sensor to a 36-pixel array to increase sensitivity and mitigate gamma-induced backgrounds. Phase III also uses a new continuous data acquisition system that greatly increases the flexibility for signal processing and data cleaning. We have developed procedures for signal processing and spectral fitting that are sufficiently robust to be automated for large datasets. This article presents the optimized procedures before unblinding the majority of the Phase III dataset to search for physics beyond the standard model.",
author = "\{BeEST Collaboration\} and Inwook Kim and Connor Bray and Andrew Marino and Caitlyn Stone-Whitehead and Amii Lamm and Ryan Abells and Pedro Amaro and Adrien Andoche and Robin Cantor and David Diercks and Spencer Fretwell and Abigail Gillespie and Mauro Guerra and Ad Hall and Harris, \{Cameron N.\} and Harris, \{Jackson T.\} and Calvin Hinkle and Hayen, \{Leendert M.\} and Hervieux, \{Paul Antoine\} and Kim, \{Geon Bo\} and Leach, \{Kyle G.\} and Annika Lennarz and Vincenzo Lordi and Jorge Machado and David McKeen and Xavier Mougeot and Francisco Ponce and Chris Ruiz and Amit Samanta and Santos, \{Jos{\'e} Paulo\} and Joseph Smolsky and John Taylor and Joseph Templet and Sriteja Upadhyayula and Louis Wagner and Warburton, \{William K.\} and Benjamin Waters and Stephan Friedrich",
note = "Funding Information: The BeEST experiment is funded by the U.S. Department of Energy, Office of Nuclear Physics under Awards No. SCW1758 and No. DE-SC0021245, the LLNL Laboratory Directed Research and Development program through Grants No. 19-FS-027 and No. 20-LW-006, the Gordon and Betty Moore Foundation (10.37807/GBMF11571), the European Metrology Programme for Innovation and Research (EMPIR) Projects No. 17FUN02 MetroMMC and No. 20FUN09 PrimA-LTD, and the FCT\textbackslash{}u2014Funda\textbackslash{}u00E7\textbackslash{}u00E3o para a Ci\textbackslash{}u00EAncia e a Tecnologia (Portugal) through national funds in the framework of the projects No. UID/04559/2020 (LIBPhys). TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada. F.\textbackslash{}u2009P. is supported by Pacific Northwest National Laboratory, which is managed for the U.S. Department of Energy by Battelle under Contract No. DE-AC05-76RL01830. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344. Funding Information: The BeEST experiment is funded by the U.S. Department of Energy, Office of Nuclear Physics under Awards No. SCW1758 and No. DE-SC0021245, the LLNL Laboratory Directed Research and Development program through Grants No. 19-FS-027 and No. 20-LW-006, the Gordon and Betty Moore Foundation (10.37807/GBMF11571), the European Metrology Programme for Innovation and Research (EMPIR) Projects No. 17FUN02 MetroMMC and No. 20FUN09 PrimA-LTD, and the FCT\textbackslash{}u2014Funda\textbackslash{}u00E7\textbackslash{}u00E3o para a Ci\textbackslash{}u00EAncia e a Tecnologia (Portugal) through national funds in the framework of the projects No. UID/04559/2020 (LIBPhys). TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada. F.P. is supported by Pacific Northwest National Laboratory, which is managed for the U.S. Department of Energy by Battelle under Contract No. DE-AC05-76RL01830. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344. Publisher Copyright: {\textcopyright} 2025 American Physical Society.",
year = "2025",
month = mar,
day = "19",
doi = "10.1103/PhysRevD.111.052010",
language = "English",
volume = "111",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "The American Physical Society",
}