Bound on 
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 Active-Sterile Neutrino Mixing from the First Four-Week Science Run of KATRIN

Aker, M.; Altenmüller, K.; Beglarian, A.; Behrens, J.; Berlëv, A. I.; Besserer, U.; Bieringer, B.; Blaum, Klaus; Block, F.; Bornschein, B.; Bornschein, L.; Böttcher, M.; Brunst, T.; Caldwell, T. S.; Cascio, L. La; Chilingaryan, S.; Choi, W.; Barrero, D. Díaz; Debowski, K.; Deffert, M.; Descher, M.; Doe, P. J.; Dragoun, O.; Drexlin, G.; Dyba, S.; Edzards, F.; Eitel, K.; Ellinger, Enrico; Engel, R.; Enomoto, S.; Fedkevych, M.; Felden, A.; Formaggio, J. A.; Fränkle, F. M.; Franklin, G.; Friedel, F.; Fulst, A.; Gauda, K.; Gil, W.; Glück, F.; Größle, Robin; Gumbsheimer, R.; Höhn, Thomas; Hannen, V.; Haußmann, N.; Helbing, K.; Hickford, S.; Hiller, R.; Hillesheimer, D.; Hinz, D.; Houdy, T.; Huber, A.; Jansen, A.; Köllenberger, L.; Karl, C.; Kellerer, J.; Kippenbrock, L.; Klein, Manuel; Kopmann, A.; Korzeczek, M.; Kovalı́k, A.; Krasch, B.; Krause, H.; Lasserre, T.; Le, T. L.; Lebeda, O.; Guennic, N. Le; Lehnert, B.; Lokhov, Alexey; Poyato, J.M.L.; Müller, Klaus Peter; Machatschek, M.; Malcherek, E.; Mark, M.; Marsteller, A.; Martín, E. L.; Melzer, C.; Mertens, S.; Niemes, S.; Oelpmann, P.; Osipowicz, A.; Parno, D. S.; Poon, A. W. P.; Priester, F.; Röllig, M.; Röttele, C.; Rest, O.; Robertson, R. G. H.; Rodenbeck, C.; Ryšavý, M.; Sack, R.; Sáenz, Alejandro; Schaller, A.; Schäfer, P.; Schimpf, L.; Schlösser, M.; Schlösser, K.; Schlüter, L.; Schrank, M.; Schulz, B.; Šefčík, M.; Seitz-Moskaliuk, H.; Sibille, V.; Siegmann, D.; Slezák, M.; Spanier, F.; Steidl, M.; Sturm, M.; Sun, Min; Telle, Helmut H.; Thümmler, T.; Thorne, L. A.; Titov, N.; Tkachev, I.; Trost, N.; Vénos, D.; Valerius, K.; Hernández, A. P. Vizcaya; Wüstling, S.; Weber, M.; Weinheimer, C.; Weiss, C.; Welte, S.; Wendel, J.; Wilkerson, J. F.; Wolf, J.; Xu, W.; Yen, Y.-R.; Zadoroghny, S.; Zeller, G. P.

doi:10.1103/physrevlett.126.091803

Cited by 51 publications

(51 citation statements)

References 50 publications

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“…High-precision β-spectroscopy with the KATRIN experiment has proven to be a powerful means to probe the neutrino mass with unprecedented sensitivity and to explore physics beyond the standard model, such as sterile neutrinos 64 . Together with cosmological probes and searches for neutrinoless double-β decay 65 , the upcoming KATRIN data will play a key role in measuring the neutrino-mass parameters.…”

Section: Discussionmentioning

confidence: 99%

Direct neutrino-mass measurement with sub-electronvolt sensitivity

Aker¹,

Beglarian²,

Behrens³

et al. 2022

Nat. Phys.

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240

177

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Since the discovery of neutrino oscillations, we know that neutrinos have non-zero mass. However, the absolute neutrino-mass scale remains unknown. Here we report the upper limits on effective electron anti-neutrino mass, mν, from the second physics run of the Karlsruhe Tritium Neutrino experiment. In this experiment, mν is probed via a high-precision measurement of the tritium β-decay spectrum close to its endpoint. This method is independent of any cosmological model and does not rely on assumptions whether the neutrino is a Dirac or Majorana particle. By increasing the source activity and reducing the background with respect to the first physics campaign, we reached a sensitivity on mν of 0.7 eV c–2 at a 90% confidence level (CL). The best fit to the spectral data yields $${{\mbox{}}}{m}_{\nu }^{2}{{\mbox{}}}$$ m ν 2 = (0.26 ± 0.34) eV2 c–4, resulting in an upper limit of mν < 0.9 eV c–2 at 90% CL. By combining this result with the first neutrino-mass campaign, we find an upper limit of mν < 0.8 eV c–2 at 90% CL.

show abstract

Section: Discussionmentioning

confidence: 99%

Direct neutrino-mass measurement with sub-electronvolt sensitivity

Aker¹,

Beglarian²,

Behrens³

et al. 2022

Nat. Phys.

Self Cite

240

177

View full text Add to dashboard Cite

show abstract

“…High-precision β-spectroscopy with the KATRIN experiment has proven to be a powerful means to probe the neutrino mass with unprecedented sensitivity and to explore physics beyond the Standard Model, such as sterile neutrinos 66 . Together with cosmological probes and searches for neutrinoless double β-decay 67 , the upcoming KATRIN data will play a key role in measuring the neutrino mass parameters.…”

Section: Discussionmentioning

confidence: 99%

First direct neutrino-mass measurement with sub-eV sensitivity

Aker¹,

Böttcher²,

Beglarian³

et al. 2021

Preprint

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We report the results of the second measurement campaign of the Karlsruhe Tritium Neutrino (KATRIN) experiment. KATRIN probes the effective electron anti-neutrino mass, mν, via a high-precision measurement of the tritium β-decay spectrum close to its endpoint at 18.6 keV. In the second physics run presented here, the source activity was increased by a factor of 3.8 and the background was reduced by 25% with respect to the first campaign. A sensitivity on mν of 0.7 eV/c2 at 90% confidence level (CL) was reached. This is the first sub-eV sensitivity from a direct neutrino-mass experiment. The best fit to the spectral data yields mν2=(0.26±0.34) eV2/c4, resulting in an upper limit of mν<0.9 eV/c2 (90% CL). By combining this result with the first neutrino mass campaign, we find an upper limit of mν<0.8 eV/c2 (90% CL).

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“…PROSPECT plans a detector upgrade possibly also involving deployment at a HEU and LEU reactor to resolve isotopic dependencies [65]. In addition to the reactor experiments, KATRIN has recently achieved exclusion limits at very high mass splittings [29]. They could provide an additional competitive exclusion in the higher mass slitting range of reactor experiments in the future, as indicated in Figure 1.…”

Section: Discussionmentioning

confidence: 99%

“…KATRIN's current and expected exclusion limits are shown in addition. Reprinted from[29] under CC BY 4.0.…”

mentioning

confidence: 99%

Status of Anomalies and Sterile Neutrino Searches at Nuclear Reactors

Schoppmann

2021

Universe

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Two anomalies at nuclear reactors, one related to the absolute antineutrino flux, one related to the antineutrino spectral shape, have drawn special attention to the field of reactor neutrino physics during the past decade. Numerous experimental efforts have been launched to investigate the reliability of flux models and to explore whether sterile neutrino oscillations are at the base of the experimental findings. This review aims to provide an overview on the status of experimental searches at reactors for sterile neutrino oscillations and measurements of the antineutrino spectral shape in mid-2021. The individual experimental approaches and results are reviewed. Moreover, global and joint oscillation and spectral shape analyses are discussed. Many experiments allow setting of constraints on sterile oscillation parameters, but cannot yet cover the entire relevant parameter space. Others find evidence in favour of certain parameter space regions. In contrast, findings on the spectral shape appear to give an overall consistent picture across experiments and allow narrowing down of contributions of certain isotopes.

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Bound on 3+1 Active-Sterile Neutrino Mixing from the First Four-Week Science Run of KATRIN

Cited by 51 publications

References 50 publications

Direct neutrino-mass measurement with sub-electronvolt sensitivity

Direct neutrino-mass measurement with sub-electronvolt sensitivity

First direct neutrino-mass measurement with sub-eV sensitivity

Status of Anomalies and Sterile Neutrino Searches at Nuclear Reactors

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