SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 116: Neutrinos Legend, Neutrino Theory

T 116.6: Talk

Thursday, March 23, 2023, 17:05–17:20, POT/0251

Light new particles in tritium beta decay — •Philipp Goller, Syuhei Iguro, and Ulrich Nierste — Institut für Theoretische Teilchenphysik (TTP), Karlsruhe Institute of Technology (KIT)

A hypothetical new light particle S interacting with neutrinos can be produced in the tritium beta decay studied in the KATRIN experiment. Near the kinematic endpoint the presence of various small energy scales (neutrino mass and energy, mass of S) require a careful treatment of the phase space integral. I present the prediction for the differential decay rate in the region probed by KATRIN and discuss the shape of the electron energy spectrum for different mass scenarios.