SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 13: Neutrinos I

T 13.5: Vortrag

Montag, 20. März 2023, 17:30–17:45, POT/0251

A Look at General Neutrino Interactions with KATRIN — •Caroline Fengler for the KATRIN collaboration — Institute of Experimental Particle Physics, Karlsruhe Institute of Technology

The KATRIN experiment aims to measure the neutrino mass by precision spectroscopy of tritium β-decay with a target sensitivity of 0.2 eV. Recently, KATRIN has improved the direct upper bound on the effective electron-neutrino mass to 0.8 eV at 90 % CL [1]. However, the scientific potential of KATRIN extends well beyond the neutrino mass analysis. In particular, General Neutrino Interactions (GNI) [2] can be investigated through a search for potential shape variations of the β-spectrum. For this purpose, all theoretically allowed interaction terms for neutrinos are combined in one Effective Field Theory. This enables a model-independent description of novel interactions. Such potential modifications can then be identified in the β-spectrum measured with KATRIN by means of energy-dependent contributions to the rate. The talk will introduce the theory of GNI and present recent sensitivity studies on first year KATRIN data.

[1] The KATRIN Collab. Nat. Phys. 18, 160-166, 2022.

[2] I. Bischer and W. Rodejohann. Nucl. Phys. B, 947, 2019.

This work is supported by the Helmholtz Association, the Ministry for Education and Research BMBF (05A17PM3, 05A17PX3, 05A17VK2, and 05A17WO3), the Helmholtz Alliance for Astroparticle Physics (HAP), and the Helmholtz Initiative and Networking Fund (W2/W3-118).