M. Aker, M. Bottcher, A. Beglarian, J. Behrens, A. Berlev, U. Besserer, B. Bieringer, F. Block, B. Bornschein, L. Bornschein, T. Brunst, T. Caldwell, R. Carney, L. L. Cascio, S. Chilingaryan, W. Choi, K. Debowski, M. Deffert, M. Descher, D. D. Barrero, P. Doe, O. Dragouns, G. Drexlin, K. Eitel, E. Ellinger, R. Engel, S. Enomoto, A. Felden, J. Formaggio, F. Frankle, G. Franklin, F. Friedel, A. Fulst, K. Gauda, W. Gil, F. Gluck, R. Grossle, R. Gumbsheimer, V. Gupta, T. Hohn, V. Hannen, N. Haussmann, K. Helbing, S. Hickford, R. Hiller, D. Hillsheimer, D. Hinz, T. Houdy, A. Huber, A. Jansen, C. Karl, F. Kellerer, J. Kellerer, M. Klein, C. Kohler, L. Kollenberger, A. Kopmann, M. Korzeczek, A. Kovalík, B. Krasch, H. Krause, N. Kunka, T. Lasserre, T. Le, O. Lebeda, B. Lehnert, A. Lokhov, M. Machatschek, E. Malcherek, M. Mark, A. Marsteller, E. Martín, C. Melzer, A. Menshikov, S. Mertens, S. Mertens, J. Mostafa, K. Muller, S. Niemes, P. Oelpmann, D. Parno, A. Poon, J. Poyato, F. Priester, M. Rollig, C. Rottele, R
{"title":"First direct neutrino-mass measurement with sub-eV sensitivity","authors":"M. Aker, M. Bottcher, A. Beglarian, J. Behrens, A. Berlev, U. Besserer, B. Bieringer, F. Block, B. Bornschein, L. Bornschein, T. Brunst, T. Caldwell, R. Carney, L. L. Cascio, S. Chilingaryan, W. Choi, K. Debowski, M. Deffert, M. Descher, D. D. Barrero, P. Doe, O. Dragouns, G. Drexlin, K. Eitel, E. Ellinger, R. Engel, S. Enomoto, A. Felden, J. Formaggio, F. Frankle, G. Franklin, F. Friedel, A. Fulst, K. Gauda, W. Gil, F. Gluck, R. Grossle, R. Gumbsheimer, V. Gupta, T. Hohn, V. Hannen, N. Haussmann, K. Helbing, S. Hickford, R. Hiller, D. Hillsheimer, D. Hinz, T. Houdy, A. Huber, A. Jansen, C. Karl, F. Kellerer, J. Kellerer, M. Klein, C. Kohler, L. Kollenberger, A. Kopmann, M. Korzeczek, A. Kovalík, B. Krasch, H. Krause, N. Kunka, T. Lasserre, T. Le, O. Lebeda, B. Lehnert, A. Lokhov, M. Machatschek, E. Malcherek, M. Mark, A. Marsteller, E. Martín, C. Melzer, A. Menshikov, S. Mertens, S. Mertens, J. Mostafa, K. Muller, S. Niemes, P. Oelpmann, D. Parno, A. Poon, J. Poyato, F. Priester, M. Rollig, C. Rottele, R","doi":"10.21203/RS.3.RS-544214/V1","DOIUrl":"https://doi.org/10.21203/RS.3.RS-544214/V1","url":null,"abstract":"\u0000 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\u0000to 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\u0000the 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).","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80441290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Alesini, C. Braggio, G. Carugno, N. Crescini, D. D'Agostino, D. Di Gioacchino, R. Di Vora, P. Falferi, U. Gambardella, C. Gatti, G. Iannone, C. Ligi, A. Lombardi, G. Maccarrone, A. Ortolan, R. Pengo, A. Rettaroli, G. Ruoso, L. Taffarello, S. Tocci
{"title":"Search for invisible axion dark matter of mass \u0000ma=43 μeV\u0000 with the QUAX–\u0000aγ\u0000 experiment","authors":"D. Alesini, C. Braggio, G. Carugno, N. Crescini, D. D'Agostino, D. Di Gioacchino, R. Di Vora, P. Falferi, U. Gambardella, C. Gatti, G. Iannone, C. Ligi, A. Lombardi, G. Maccarrone, A. Ortolan, R. Pengo, A. Rettaroli, G. Ruoso, L. Taffarello, S. Tocci","doi":"10.1103/PhysRevD.103.102004","DOIUrl":"https://doi.org/10.1103/PhysRevD.103.102004","url":null,"abstract":"An haloscope of the QUAX--$agamma$ experiment composed of an OFHC-Cu cavity inside an 8.1 T magnet and cooled to $sim200$ mK was put in operation for the search of galactic axion with mass $m_asimeq43~mutext{eV}$. The power emitted by the resonant cavity was amplified with a Josephson Parametric Amplifier whose noise fluctuations are at the Standard Quantum Limit (SQL). With the data collected in about 1 h at the cavity frequency $nu_c=10.40176$ GHz the experiment reached the sensitivity necessary for the detection of galactic QCD-axion setting the $90%$ confidence level (CL) limit to the axion-photon coupling $g_{agammagamma}<0.639cdot10^{-13}$ GeV$^{-1}$.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79476584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}