Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 39: Neutrino Physics IV

T 39.2: Vortrag

Dienstag, 1. April 2025, 16:30–16:45, VG 3.104

Unbinned analysis of ¹⁶³Ho-spectrum endpoint region — •Frederic Böhm — Kirchhoff Institute for Physics, Heidelberg University — ECHo Collaboration

The aim of the Electron Capture in ¹⁶³Ho (ECHo) collaboration is to determine the effective electron neutrino mass by analysing the endpoint region of the ¹⁶³Ho electron capture spectrum. The spectrum is measured using metallic magnetic calorimeters (MMC) enclosing ¹⁶³Ho and subsequently the data is reduced to avoid the presence of artifacts before further analysis can take place. Previously, a histogram-based approach already proved to be a suitable choice for the analysis of the spectrum and, in particular, of the endpoint region. To further improve the sensitivity of the fitting algorithms to quantify the effect of tiny neutrino masses, we are testing methods of unbinned analysis like a Kernel Density Estimation (KDE) to mitigate potential artifacts of binning the continuous event energies of the low-intensity endpoint region close to the Q-value of the ¹⁶³Ho decay. We present the implementation of these algorithms in the analysis of the ¹⁶³Ho spectrum acquired within the ECHo-1k experiment and compare the results with the ones obtained with binned spectra.

Keywords: Metallic Magnetic Calorimeter; Effective Neutrino Mass; Data Analysis; Unbinned Analysis; Fitting Algorithm