{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, Böttcher M, Brofferio C, Bruch C, Brunst T, Caldwell TS, Carminati M, Carney RMD, Chilingaryan S, Choi W, Cremonesi O, Debowski K, Descher M, Barrero DD, Doe PJ, Dragoun O, Drexlin G, Edzards F, Eitel K, Ellinger E, Engel R, Enomoto S, Felden A, Fink D, Fiorini C, Formaggio JA, Forstner C, Fränkle FM, Franklin GB, Friedel F, Fulst A, Gauda K, Gavin AS, Gil W, Glück F, Grande A, Grössle R, Gugiatti M, Gumbsheimer R, Hannen V, Hartmann J, Hau{ß}mann N, Helbing K, Hickford S, Hiller R, Hillesheimer D, Hinz D, Höhn T, Houdy T, Huber A, Jansen A, Karl C, Kellerer J, King P, Kleifges M, Klein M, Köhler C, Köllenberger L, Kopmann A, Korzeczek M, Koval{í}}k A, Krasch B, Krause H, Lasserre T, Cascio LL, Lebeda O, Lechner P, Lehnert B, Le TL, Lokhov A, Machatschek M, Malcherek E, Manfrin D, Mark M, Marsteller A, Martin EL, Mazzola E, Melzer C, Mertens S, Mostafa J, Müller K, Nava A, Neumann H, Niemes S, Oelpmann P, Onillon A, Parno DS, Pavan M, Pigliafreddo A, Poon AWP, Poyato JML, Pozzi S, Priester F, Puritscher M, Radford DC, R{á}}li{š}} J, Ramachandran S, Robertson RGH, Rodejohann W, Rodenbeck C, Röllig M, Röttele C, Ry{š}}av{ý}} M, Sack R, Saenz A, Salomon RWJ, Schäfer P, Schimpf L, Schlösser K, Schlösser M, Schlüter L, Schneidewind S, Schrank M, Schütz A, Schwemmer A, Sedlak A, {Š}}ef{č}}{í}}k M, Sibille V, Siegmann D, Slez{á}}k M, Spanier F, Spreng D, Steidl M, Sturm M, Telle HH, Thorne LA, Thümmler T, Titov N, Tkachev I, Trigilio P, Urban K, Valerius K, V{é}}nos D, Hern{á}}ndez APV, Voigt P, Weinheimer C, Welte S, Wendel J, Wiesinger C, Wilkerson JF, Wolf J, Wunderl L, Wüstling S, Wydra J, Xu W, Zadoroghny S, Zeller G

Abstract

The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure a high-precision integral spectrum of the endpoint region of T2 β 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.