Speaker
Description
The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure the effective electron antineutrino mass with a sensitivity better than $m_\nu c^2=0.3\,\text{eV}$ (90% C.L.) in a kinematic approach by applying precision electron spectroscopy to the beta decay of molecular tritium. The measurement focuses on the spectral endpoint ($E_0$) region, extending up to tens of $\text{eV}$ below $E_0 \approx 18.6\,\text{keV}$.
Light neutral pseudoscalar or vector bosons arise in various theories beyond the Standard Model. Constraints on their couplings to neutrinos or electrons can be derived from cosmological, astrophysical and laboratory observations. KATRIN complements these approaches, as the emission of an additional light state in tritium decay introduces characteristic modifications to the observed electron energy spectrum. We present the sensitivity of KATRIN to such new light bosons, based on data from 2019, corresponding to $4 \times 10^6$ electrons in the analysis interval of $[-40, +130]\,\text{eV}$ around $E_0$.
This work is supported by the Helmholtz Association and by the Ministry for Education and Research BMBF (grant numbers 05A23PMA, 05A23PX2, 05A23VK2, and 05A23WO6) and the bwForCluster NEMO.
| Collaboration you are representing | KATRIN |
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