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Behrens, J; Beisenkötter, J; Biondi, Y; Block, F; Bobien, S; Böttcher, M; Bornschein, B; Bornschein, L; Caldwell, T S; Carminati, M; Chilingaryan, S; Daniel, B A; Debowski, K; D Díaz Barrero; Doe, P J; Dragoun, O; Edzards, F; Eitel, K; Ellinger, E; Felden, A; Fengler, C; stner, C; Fränkle, F M; Gavin, A S; Gil, W; Glück, F; Grohmann, S; Grössle, R; Gumbsheimer, R; Hasselmann, L; Haußmann, N; Helbing, K; Henke, H; Heyns, S; Hickford, S; Hiller, R; Hillesheimer, D; Höhn, T; Huber, A; Karl, C; Khosonthongkee, K; Klein, M; Kopmann, A; Krause, H; La Cascio, L; Lasserre, T; T Le; Lebeda, O; G Li; Lokhov, A; Machatschek, M; Mark, M; Melzer, C; Mertens, S; Mostafa, J; Müller, K; Nava, A; Neumann, H; Onillon, A; Parno, D S; Pavan, M; Pinsook, U; Ráliš, J; Robertson, R G H; Rodenbeck, C; Röllig, M; Röttele, C; Sack, R; Schäfer, P; Schneidewind, S; Schnurr, U; Schrank, M; Schürmann, J; Schütz, A; Schwemmer, A; Schwenck, A; Šefčík, M; Siegmann, D; Simon, F; Spanier, F; Sreethawong, W; Štorek, J; Stribl, X; Suwonjandee, N; Telle, H H; Thorne, L A; Thümmler, T; Tirolf, S; Titov, N; Urban, K; Valerius, K; Vénos, D; Weinheimer, C; Wendel, J; Wilkerson, J F; Wolf, J; Wydra, J; W Xu; Zadorozhny, S; Zeller, G
arXiv (Cornell University), 06/2024Paper, Journal Article
The fact that neutrinos carry a non-vanishing rest mass is evidence of physics beyond the Standard Model of elementary particles. Their absolute mass bears important relevance from particle physics to cosmology. In this work, we report on the search for the effective electron antineutrino mass with the KATRIN experiment. KATRIN performs precision spectroscopy of the tritium \(\beta\)-decay close to the kinematic endpoint. Based on the first five neutrino-mass measurement campaigns, we derive a best-fit value of \(m_\nu^{2} = {-0.14^{+0.13}_{-0.15}}~\mathrm{eV^2}\), resulting in an upper limit of \(m_\nu < {0.45}~\mathrm{eV}\) at 90 % confidence level. With six times the statistics of previous data sets, amounting to 36 million electrons collected in 259 measurement days, a substantial reduction of the background level and improved systematic uncertainties, this result tightens KATRIN's previous bound by a factor of almost two.
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