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  • Search for Lorentz-Invariance Violation with the first KATRIN data
    Batzler, D; Behrens, J; Berlev, A; Besserer, U; Block, F; Bobien, S; Bornschein, B; Bornschein, L; Böttcher, M; Caldwell, T S; Carney, R M D; Debowski, K; Deffert, M; Descher, M; D Díaz Barrero; Doe, P J; Dragoun, O; Drexlin, G; Edzards, F; Eitel, K; Ellinger, E; Enomoto, S; Felden, A; maggio, J A; Fränkle, F M; Franklin, G B; Fulst, A; Gavin, A S; Gil, W; Glück, F; Grössle, R; Hannen, V; Haußmann, N; Helbing, K; Hinz, D; Höhn, T; Houdy, T; Jansen, A; Karl, C; Kellerer, J; Kleifges, M; Kopmann, A; Korzeczek, M; Kovalík, A; Krasch, B; Krause, H; La Cascio, L; Lasserre, T; Lebeda, O; Lehnert, B; Lokhov, A; Machatschek, M; Malcherek, E; Marsteller, A; Melzer, C; Mertens, S; Mostafa, J; Müller, K; Neumann, H; Niemes, S; Oelpmann, P; Parno, D S; Poon, A W P; Priester, F; Ráliš, J; Ramachandran, S; Robertson, R G H; Rodejohann, W; Rodenbeck, C; Röllig, M; Röttele, C; Ryšavý, M; Sack, R; Saenz, A; Salomon, R; Schimpf, L; Schlösser, K; Schlüter, L; Schneidewind, S; Schwemmer, A; Sibille, V; Siegmann, D; Slezák, M; Spanier, F; Steidl, M; Sturm, M; Titov, N; Tkachev, I; Urban, K; Vénos, D; Vizcaya Hernández, A P; Weinheimer, C; Welte, S; Wendel, J; Wickles, J; Wiesinger, C; Wilkerson, J F; Wüstling, S; W Xu; Zadoroghny, S

    arXiv.org, 07/2022
    Paper, Journal Article

    Some extensions of the Standard Model of Particle Physics allow for Lorentz invariance and Charge-Parity-Time (CPT)-invariance violations. In the neutrino sector strong constraints have been set by neutrino-oscillation and time-of-flight experiments. However, some Lorentz-invariance-violating parameters are not accessible via these probes. In this work, we focus on the parameters \((a_{\text{of}}^{(3)})_{00}\), \((a_{\text{of}}^{(3)})_{10}\) and \((a_{\text{of}}^{(3)})_{11}\) which would manifest themselves in a non-isotropic beta-decaying source as a sidereal oscillation and an overall shift of the spectral endpoint. Based on the data of the first scientific run of the KATRIN experiment, we set the first limit on \(\left|(a_{\text{of}}^{(3)})_{11}\right|\) of \(< 3.7\cdot10^{-6}\) GeV at 90\% confidence level. Moreover, we derive new constraints on \((a_{\text{of}}^{(3)})_{00}\) and \((a_{\text{of}}^{(3)})_{10}\).

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