First direct neutrino-mass measurement with sub-eV sensitivity

Aker, M.; A., Beglarian,; Behrens, J.; Berlev, A.; Besserer, U.; Bieringer, B.; F., Block,; Bornschein, B.; Bornschein, L.; Böttcher, M.; Brunst, T.; Caldwell, T. S.; Carney, R. M. D.; Cascio, L. La; Chilingaryan, S.; Choi, W.; Debowski, K.; Deffert, M.; Descher, M.; Barrero, D. Díaz; Doe, P. J.; O., Dragoun,; Drexlin, G.; Eitel, K.; Ellinger, E.; Engel, R.; S., Enomoto,; Felden, A.; Formaggio, J. A.; Fränkle, F. M.; Franklin, G. B.; Friedel, F.; A., Fulst,; Gauda, K.; W., Gil,; Glück, F.; Grössle, R.; Gumbsheimer, R.; V., Gupta,; Höhn, T.; Hannen, V.; Haußmann, N.; K., Helbing,; Hickford, S.; Hiller, R.; Hillesheimer, D.; D., Hinz,; Houdy, T.; Huber, A.; A., Jansen,; Karl, C.; Kellerer, F.; J., Kellerer,; M., Klein,; Köhler, C.; Köllenberger, L.; Kopmann, A.; Korzeczek, M.; Kovalík, A.; B., Krasch,; Krause, H.; Kunka, N.; Lasserre, T.; Le, T. L.; O., Lebeda,; Lehnert, B.; Lokhov, A.; Machatschek, M.; Malcherek, E.; Mark, M.; A., Marsteller,; Martin, E. L.; Melzer, C.; Menshikov, A.; Mertens, S.; Mostafa, J.; Müller, K.; S., Niemes,; Oelpmann, P.; Parno, D. S.; Poon, A. W. P.; Poyato, J.; Priester, F.; M., Röllig,; C., Röttele,; Robertson, R. G. H.; Rodejohann, W.; C., Rodenbeck,; Ryšavý, M.; Sack, R.; A., Saenz,; Schäfer, P.; Schaller, A.; Schimpf, L.; Schlösser, K.; M., Schlösser,; Schlüter, L.; Schneidewind, S.; M., Schrank,; Schulz, B.; Schwemmer, A.; Šefčík, M.; V., Sibille,; Siegmann, D.; Slezák, M.; M., Steidl,; M., Sturm,; Sun, M.; Tcherniakhovski, D.; Telle, H. H.; Thorne, L. A.; Thümmler, T.; Titov, N.; I., Tkachev,; Urban, K.; Valerius, K.; D., Vénos,; Hernández, A. P. Vizcaya; Weinheimer, C.; Welte, S.; Wendel, J.; Wilkerson, Jessica; Wolf, J.; S., Wüstling,; Xu, W.; Yen, Y. -R.; S., Zadoroghny,; G., Zeller,

doi:10.48550/arxiv.2105.08533

Cited by 55 publications

(109 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A contribution of the Penning trap between the main spectrometer and the prespectrometer to the background rate was studied in detail and a dedicated electron catcher system is used to remove trapped electrons from the inter-spectrometer region [21]. To avoid time-dependent background rate of the Penning trap [9,10] the pre-spectrometer was grounded in the later measurement campaigns. The focal-plane detector of KATRIN contributes ∼ 35 mcps to the background rate due to radioactivity and cosmic muons.…”

Section: Katrin Background Sourcesmentioning

confidence: 99%

“…The radon-induced background counts do not follow a Poisson distribution due to the time correlation between the secondary events in a cluster of counts produced in a short time by the same primary electron. This non-poissonian behaviour leads additionally to an effective increase of statistical fluctuations and reduces the sensitivity of the neutrino mass measurement [8,9,10].…”

Section: Katrin Background Sourcesmentioning

confidence: 99%

“…2, orange) with the help of the air coil system surrounding the spectrometer vessel [27] in order to reduce the volume of the downstream flux tube from 341 m 3 to 160 m 3 and, thus, the background rate from about 0.6 cps to a level of about 0.3 cps. This setting was used for the first neutrino mass measurements of KATRIN [8,9,10].…”

Section: Shifted Analysing Plane Configurationmentioning

confidence: 99%

“…Such kinematics-based measurements study the shape of the energy spectrum of β-decay or electron capture processes and require high statistics and high energy resolution combined with very low experimental background rates. These requirements are fulfilled in the KATRIN experiment, which has recently obtained a new upper limit on the neutrino mass of 0.8 eV (90% CL) after its first two neutrino mass measurement campaigns [8,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…The ultimate sensitivity of KATRIN of 0.2 eV (90% CL) within 3 years of total measurement time requires a background rate of O(10) mcps [11] whileafter multiple rounds of improvements -the current background rate of 220 mcps with 117 out of 148 pixels [10] still exceeds this requirement by more than an order of magnitude. Applying the simple scaling laws given in [11] (footnote 34) and in [12] (equation 48), the statistical sensitivity to the neutrino mass is reduced due to the higher background by about a factor of 1.4.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Background reduction at the KATRIN experiment by the shifted analysing plane configuration

Lokhov,

Bieringer,

Drexlin

et al. 2022

Preprint

View full text Add to dashboard Cite

The KATRIN experiment aims at measuring the electron neutrino mass with a sensitivity of 0.2 eV/c 2 after five years of data taking. Recently a new upper limit for the neutrino mass of 0.8 eV/c 2 (90% CL) was obtained. To reach the design sensitivity, a reduction of the background rate by one order of magnitude is required. The shifted analysing plane (SAP) configuration exploits a specific shaping of the electric and magnetic fields in the KATRIN main spectrometer to reduce the spectrometer background by a factor of two. We discuss the general idea of the SAP configuration and describe the main features of this novel measurement mode.

show abstract

Section: Katrin Background Sourcesmentioning

confidence: 99%

Section: Katrin Background Sourcesmentioning

confidence: 99%

Section: Shifted Analysing Plane Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Background reduction at the KATRIN experiment by the shifted analysing plane configuration

Lokhov,

Bieringer,

Drexlin

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

Search for heavy neutral leptons in final states with electrons, muons, and hadronically decaying tau leptons in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV

Hayrapetyan,

Tumasyan,

Adam

et al. 2024

J. High Energ. Phys.

View full text Add to dashboard Cite

A search for heavy neutral leptons (HNLs) of Majorana or Dirac type using proton-proton collision data at $$ \sqrt{s} $$ s = 13 TeV is presented. The data were collected by the CMS experiment at the CERN LHC and correspond to an integrated luminosity of 138 fb−1. Events with three charged leptons (electrons, muons, and hadronically decaying tau leptons) are selected, corresponding to HNL production in association with a charged lepton and decay of the HNL to two charged leptons and a standard model (SM) neutrino. The search is performed for HNL masses between 10 GeV and 1.5 TeV. No evidence for an HNL signal is observed in data. Upper limits at 95% confidence level are found for the squared coupling strength of the HNL to SM neutrinos, considering exclusive coupling of the HNL to a single SM neutrino generation, for both Majorana and Dirac HNLs. The limits exceed previously achieved experimental constraints for a wide range of HNL masses, and the limits on tau neutrino coupling scenarios with HNL masses above the W boson mass are presented for the first time.

show abstract