{"paper":{"title":"Improved eV-scale Sterile-Neutrino Constraints from the Second KATRIN Measurement Campaign","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. Beglarian, A. Berlev, A. Felden, A. Fulst, A. Huber, A. Jansen, A. Kopmann, A. Koval\\'ik, A. Lokhov, A. Marsteller, A. P. Vizcaya Hern\\'andez, A. Saenz, A. Schwemmer, A. S. Gavin, A. W. P. Poon, B. Bieringer, B. Bornschein, B. Krasch, B. Lehnert, C. Karl, C. K\\\"ohler, C. Melzer, C. Rodenbeck, C. R\\\"ottele, C. Weinheimer, C. Wiesinger, D. Batzler, D. D\\'iaz Barrero, D. Hillesheimer, D. Hinz, D. Siegmann, D. S. Parno, D. V\\'enos, E. Ellinger, E. L. Martin, E. Malcherek, F. Block, F. Edzards, F. Friedel, F. Gl\\\"uck, F. M. Fr\\\"ankle, F. Priester, F. Spanier, G. B. Franklin, G. Drexlin, G. Zeller, H. H. Telle, H. Krause, H. Neumann, I. Tkachev, J. A. Formaggio, J. Behrens, J. F. Wilkerson, J. Kellerer, J. M. L. Poyato, J. Mostafa, J. R\\'ali\\v{s}, J. Wendel, J. Wolf, J. Wydra, K. Debowski, K. Eitel, K. Gauda, K. Helbing, K. M\\\"uller, K. Schl\\\"osser, K. Urban, K. Valerius, L. A. Thorne, L. Bornschein, L. K\\\"ollenberger, L. La Cascio, L. Schimpf, L. Schl\\\"uter, M. Aker, M. B\\\"ottcher, M. Descher, M. Kleifges, M. Klein, M. Korzeczek, M. Machatschek, M. Mark, M. R\\\"ollig, M. Ry\\v{s}av\\'y, M. Schl\\\"osser, M. Schrank, M. Slez\\'ak, M. Steidl, M. Sturm, M. \\v{S}ef\\v{c}\\'ik, M. Wetter, N. Hau{\\ss}mann, N. Titov, O. Dragoun, O. Lebeda, P. J. Doe, P. Oelpmann, P. Sch\\\"afer, R. Engel, R. G. H. Robertson, R. Gr\\\"ossle, R. Gumbsheimer, R. Hiller, R. M. D. Carney, R. Sack, R. Salomon, S. Bobien, S. Chilingaryan, S. Enomoto, S. Hickford, S. Mertens, S. Niemes, S. Ramachandran, S. Schneidewind, S. Welte, S. W\\\"ustling, S. Zadoroghny, T. Brunst, T. H\\\"ohn, T. Houdy, T. Lasserre, T. L. Le, T. S. Caldwell, T. Th\\\"ummler, U. Besserer, V. Hannen, V. Sibille, W. Choi, W. Gil, W. Rodejohann, W. Xu","submitted_at":"2022-01-27T15:41:20Z","abstract_excerpt":"We present the results of the light sterile neutrino search from the second KATRIN measurement campaign in 2019. Approaching nominal activity, $3.76 \\times 10^6$ tritium $\\beta$-electrons are analyzed in an energy window extending down to $40\\,$eV below the tritium endpoint at $E_0 = 18.57\\,$keV. We consider the $3\\nu+1$ framework with three active and one sterile neutrino flavor. The analysis is sensitive to a fourth mass eigenstate $m_4^2\\lesssim1600\\,$eV$^2$ and active-to-sterile mixing $|U_{e4}|^2 \\gtrsim 6 \\times 10^{-3}$. As no sterile-neutrino signal was observed, we provide improved ex"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2201.11593","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2201.11593/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}