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Analysis methods for the first KATRIN neutrino-mass measurement

KATRIN Collaboration; Aker, M. 1; Altenmüller, K.; Beglarian, A. 2; Behrens, J. 3,4; Berlev, A.; Besserer, U. 1; Bieringer, B.; Blaum, K.; Block, F. 3; Bornschein, B. 1; Bornschein, L. 4; Böttcher, M.; Brunst, T.; Caldwell, T. S.; La Cascio, L. 3; Chilingaryan, S. ORCID iD icon 2; Choi, W. 3; Díaz Barrero, D.; ... mehr


We report on the dataset, data handling, and detailed analysis techniques of the first neutrino-mass measurement by the Karlsruhe Tritium Neutrino (KATRIN) experiment, which probes the absolute neutrino-mass scale via the β-decay kinematics of molecular tritium. The source is highly pure, cryogenic T2 gas. The β electrons are guided along magnetic field lines toward a high-resolution, integrating spectrometer for energy analysis. A silicon detector counts β electrons above the energy threshold of the spectrometer, so that a scan of the thresholds produces a precise measurement of the high-energy spectral tail. After detailed theoretical studies, simulations, and commissioning measurements, extending from the molecular final-state distribution to inelastic scattering in the source to subtleties of the electromagnetic fields, our independent, blind analyses allow us to set an upper limit of 1.1 eV on the neutrino-mass scale at a 90% confidence level. This first result, based on a few weeks of running at a reduced source intensity and dominated by statistical uncertainty, improves on prior limits by nearly a factor of two. This result establishes an analysis framework for future KATRIN measurements, and provides important input to both particle theory and cosmology.

Verlagsausgabe §
DOI: 10.5445/IR/1000135492
Veröffentlicht am 19.07.2021
DOI: 10.1103/PhysRevD.104.012005
Zitationen: 27
Web of Science
Zitationen: 22
Zitationen: 34
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Projekt-, Prozess- und Qualitätsmanagement (PPQ)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2470-0010, 2470-0029
KITopen-ID: 1000135492
HGF-Programm 51.13.01 (POF IV, LK 01) Neutrinophysik und Dunkle Materie
Erschienen in Physical review / D
Verlag American Physical Society (APS)
Band 104
Heft 1
Seiten Article: 012005
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Vorab online veröffentlicht am 12.07.2021
Nachgewiesen in arXiv
Web of Science
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