Probing the Neutrino-Mass Scale with the KATRIN Experiment

Lokhov, Alexey; Mertens, Susanne; Parno, Diana S.; Schlösser, Magnus; Valerius, Kathrin

doi:10.1146/annurev-nucl-101920-113013

Title: Probing the Neutrino-Mass Scale with the KATRIN Experiment

Journal Article · Fri Jul 08 00:00:00 EDT 2022 · Annual Review of Nuclear and Particle Science

DOI:https://doi.org/10.1146/annurev-nucl-101920-113013· OSTI ID:1962976

Lokhov, Alexey ^[1]; Mertens, Susanne ^[2]; Parno, Diana S. ^[3]; Schlösser, Magnus ^[4]; Valerius, Kathrin ^[4]

Karlsruhe Inst. of Technology (Germany); Westfälische Wilhelms–Univ. Münster (Germany)
Technische Univ. München, Garching (Germany); Max-Planck-Inst. für Physik, München (Germany)
Carnegie Mellon Univ., Pittsburgh, PA (United States)
Karlsruhe Inst. of Technology (Germany)

The absolute mass scale of neutrinos is an intriguing open question in contemporary physics. The as-yet-unknown mass of the lightest and, at the same time, most abundant massive elementary particle species bears fundamental relevance to theoretical particle physics, astrophysics, and cosmology. The most model-independent experimental approach consists of precision measurements of the kinematics of weak decays, notably tritium β decay. With the KATRIN experiment, this direct neutrino-mass measurement has entered the sub-eV domain, recently pushing the upper limit on the electron-based neutrino mass down to 0.8 eV (90% CL) on the basis of first-year data out of ongoing, multiyear operations. Here, we review the experimental apparatus of KATRIN, the progress of data taking, and initial results. While KATRIN is heading toward the target sensitivity of 0.2 eV, other scientific goals are pursued. We discuss the search for light sterile neutrinos and an outlook on future keV-scale sterile-neutrino searches as well as further physics opportunities beyond the Standard Model.

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Research Organization:: Carnegie Mellon Univ., Pittsburgh, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: KATRIN collaboration

Grant/Contract Number:: SC0019304; AC02-05CH11231; SC0011091; FG02-97ER41020; FG02-94ER40818; SC0004036; FG02-97ER41033; FG02-97ER41041

OSTI ID:: 1962976

Journal Information:: Annual Review of Nuclear and Particle Science, Vol. 72, Issue 1; ISSN 0163-8998

Publisher:: Annual ReviewsCopyright Statement

Country of Publication:: United States

Language:: English

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