Signal processing and spectral modeling for the BeEST experiment

Inwook Kim; Connor Bray; Andrew Marino; Caitlyn Stone-Whitehead; Amii Lamm; Ryan Abells; Pedro Amaro; Adrien Andoche; Robin Cantor; David Diercks; Spencer Fretwell; Abigail Gillespie; Mauro Guerra; Ad Hall; Cameron N. Harris; Jackson T. Harris; Calvin Hinkle; Leendert M. Hayen; Paul-Antoine Hervieux; Geon-Bo Kim; Kyle G. Leach; Annika Lennarz; Vincenzo Lordi; Jorge Machado; David McKeen; Xavier Mougeot; Francisco Ponce; Chris Ruiz; Amit Samanta; José Paulo Santos; Joseph Smolsky; John Taylor; Joseph Templet; Sriteja Upadhyayula; Louis Wagner; William K. Warburton; Benjamin Waters; Stephan Friedrich

doi:10.1103/physrevd.111.052010

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arXiv · 2409.19085

Signal processing and spectral modeling for the BeEST experiment

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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 $^7$Be by precisely measuring the recoil energy of the $^7$Li 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 data sets. This article presents the optimized procedures before unblinding the majority of the Phase-III data set to search for physics beyond the standard model.

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Inwook Kim, Connor Bray, Andrew Marino, Caitlyn Stone-Whitehead, Amii Lamm, Ryan Abells, Pedro Amaro, Adrien Andoche, Robin Cantor, David Diercks, Spencer Fretwell, Abigail Gillespie, Mauro Guerra, Ad Hall, Cameron N. Harris, Jackson T. Harris, Calvin Hinkle, Leendert M. Hayen, Paul-Antoine Hervieux, Geon-Bo Kim, Kyle G. Leach, Annika Lennarz, Vincenzo Lordi, Jorge Machado, David McKeen, Xavier Mougeot, Francisco Ponce, Chris Ruiz, Amit Samanta, José Paulo Santos, Joseph Smolsky, John Taylor, Joseph Templet, Sriteja Upadhyayula, Louis Wagner, William K. Warburton, Benjamin Waters, Stephan Friedrich. 2024-09-27. Signal processing and spectral modeling for the BeEST experiment. https://doi.org/10.1103/physrevd.111.052010

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