Speaker
Description
The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure the effective electron antineutrino mass with a sensitivity better than $m_\nu c^2=0.3\,\mathrm{eV}$ ($90\%\,\mathrm{C.L.}$) using precision electron spectroscopy of tritium beta decay. This determination occurs in the spectral endpoint ($E_0$) region, up to some $10\,\mathrm{eV}$ below $E_0\approx 18.6\,\mathrm{keV}$.
Light neutral pseudoscalars and vector bosons arise in many theories beyond the Standard Model (BSM). High-statistics beta spectroscopy with KATRIN is a complementary probe for these new physics theories regarding coupling strengths of bosons to neutrinos or electrons.
The measured beta spectrum is characteristically distorted due to the emission of an additional boson in the decay as described in JHEP 01 (2019) 206. We present the sensitivity estimates of the second measurement campaign ($4\times 10^6$ electrons in the ROI of $[-40, +130]\,\mathrm{eV}$ around $E_0$) to such light boson couplings.
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