KATRIN: status and prospects for the neutrino mass and beyond

Aker, M; Balzer, M; Batzler, D; Beglarian, A; Behrens, J; Berlev, A; Besserer, U; Biassoni, M; Bieringer, B; Block, F; Bobien, S; Bombelli, L; Bormann, D; Bornschein, B; Bornschein, L; B??ttcher, M; Brofferio, C; Bruch, C; Brunst, T; S Caldwell, T; Carminati, M; R M, D Carney; Chilingaryan, S; Choi, W; Cremonesi, O; Debowski, K; Descher, M; D D??az Barrero,; J Doe, P; Dragoun, O; Drexlin, G; Edzards, F; Eitel, K; Ellinger, E; Engel, R; Enomoto, S; Felden, A; Fink, D; Fiorini, C; A Formaggio, J; Forstner, C; M Fr??nkle, F; B Franklin, G; Friedel, F; Fulst, A; Gauda, K; S Gavin, A; Gil, W; Gl??ck, F; Grande, A; Gr??ssle, R; Gugiatti, M; Gumbsheimer, R; Hannen, V; Hartmann, J; Hau??mann, N; Helbing, K; Hickford, S; Hiller, R; Hillesheimer, D; Hinz, D; H??hn, T; Houdy, T; Huber, A; Jansen, A; Karl, C; Kellerer, J; King, P; Kleifges, M; Klein, M; K??hler, C; K??llenberger, L; Kopmann, A; Korzeczek, M; Koval??k, A; Krasch, B; Krause, H; Lasserre, T; L La Cascio,; Lebeda, O; Lechner, P; Lehnert, B; L Le, T; Lokhov, A; Machatschek, M; Malcherek, E; Manfrin, D; Mark, M; Marsteller, A; L Martin, E; Mazzola, E; Melzer, C; Mertens, S; Mostafa, J; M??ller, K; Nava, A; Neumann, H; Niemes, S; Oelpmann, P; Onillon, A; S Parno, D; Pavan, M; Pigliafreddo, A; A W, P Poon; J M, L Poyato; Pozzi, S; Priester, F; Puritscher, M; C Radford, D; R??li??, J; Ramachandran, S; R G, H Robertson; Rodejohann, W; Rodenbeck, C; R??llig, M; R??ttele, C; Ry??av??, M; Sack, R; Saenz, A; R W, J Salomon; Sch??fer, P; Schimpf, L; Schl??sser, K; Schl??sser, M; Schl??ter, L; Schneidewind, S; Schrank, M; Sch??tz, A-K; Schwemmer, A; Sedlak, A; ??ef????k, M; Sibille, V; Siegmann, D; Slez??k, M; Spanier, F; Spreng, D; Steidl, M; Sturm, M; H Telle, H; A Thorne, L; Th??mmler, T; Titov, N; Tkachev, I; Trigilio, P; Urban, K; Valerius, K; V??nos, D; P Vizcaya Hern??ndez, A; Voigt, P; Weinheimer, C; Welte, S; Wendel, J; Wiesinger, C; F Wilkerson, J; Wolf, J; Wunderl, L; W??stling, S; Wydra, J; Xu, W; Zadoroghny, S; Zeller, G

doi:10.1088/1361-6471/ac834e

The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure a high-precision integral spectrum of the endpoint region of T-2 beta decay, with the primary goal of probing the absolute mass scale of the neutrino. After a first tritium commissioning campaign in 2018, the experiment has been regularly running since 2019, and in its first two measurement campaigns has already achieved a sub-eV sensitivity. After 1000 days of data-taking, KATRIN's design sensitivity is 0.2 eV at the 90% confidence level. In this white paper we describe the current status of KATRIN; explore prospects for measuring the neutrino mass and other physics observables, including sterile neutrinos and other beyond-Standard-Model hypotheses; and discuss research-and-development projects that may further improve the KATRIN sensitivity.