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First direct neutrino-mass measurement with sub-eV sensitivity

by Malcherek, E , Ryšavý, M , Schwemmer, A , Kopmann, A , Rodejohann, W , Wüstling, S , Hiller, R , Lasserre, T , Thümmler, T , Fränkle, F M , Krause, H , Köllenberger, L , Krasch, B , Šefčík, M , Haußmann, N , Röllig, M , Ellinger, E , Berlev, A , Jansen, A , Schlüter, L , Beglarian, A , maggio, J A , Sibille, V , Deffert, M , Grössle, R , Parno, D S , La Cascio, L , Martin, E L , Lokhov, A , Schulz, B , Drexlin, G , Telle, H H , Huber, A , Siegmann, D , Schäfer, P , Tcherniakhovski, D , Friedel, F , Röttele, C , Wilkerson, J F , Aker, M , Zeller, G , Besserer, U , Kunka, N , Rodenbeck, C , Gil, W , Thorne, L A , Robertson, R G H , Titov, N , Schlösser, K , Vénos, D , Schlösser, M , Franklin, G B , Wolf, J , Carney, R M D , Karl, C , Priester, F , Bornschein, B , Mark, M , Saenz, A , Engel, R , Helbing, K , Melzer, C , Bornschein, L , Slezák, M , Sack, R , Debowski, K , Böttcher, M , Glück, F , Marsteller, A , Schimpf, L , Schneidewind, S , Vizcaya Hernández, A P , Brunst, T , Behrens, J , Köhler, C , Tkachev, I , Caldwell, T S , Dragoun, O , D Díaz Barrero , Hillesheimer, D , Valerius, K , Gupta, V , Lehnert, B , Schaller, A , W Xu , Fulst, A , Hinz, D , Houdy, T , Müller, K , Schrank, M , Kellerer, J , Le, T L , Enomoto, S , Wendel, J , Niemes, S , Weinheimer, C , Kel

in Beta decay / Confidence intervals / Neutrinos / Sensitivity / Tritium

2021

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First direct neutrino-mass measurement with sub-eV sensitivity

in Beta decay / Confidence intervals / Neutrinos / Sensitivity / Tritium

2021

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First direct neutrino-mass measurement with sub-eV sensitivity

in Beta decay / Confidence intervals / Neutrinos / Sensitivity / Tritium

2021

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Paper

First direct neutrino-mass measurement with sub-eV sensitivity

Malcherek, E,

Ryšavý, M,

Schwemmer, A,

Kopmann, A,

Rodejohann, W,

Wüstling, S,

Hiller, R,

Lasserre, T,

Thümmler, T,

Fränkle, F M,

Krause, H,

Köllenberger, L,

Krasch, B,

Šefčík, M,

Haußmann, N,

Röllig, M,

Ellinger, E,

Berlev, A,

Jansen, A,

Schlüter, L,

Beglarian, A,

maggio, J A,

Sibille, V,

Deffert, M,

Grössle, R,

Parno, D S,

La Cascio, L,

Martin, E L,

Lokhov, A,

Schulz, B,

Drexlin, G,

Telle, H H,

Huber, A,

Siegmann, D,

Schäfer, P,

Tcherniakhovski, D,

Friedel, F,

Röttele, C,

Wilkerson, J F,

Aker, M,

Zeller, G,

Besserer, U,

Kunka, N,

Rodenbeck, C,

Gil, W,

Thorne, L A,

Robertson, R G H,

Titov, N,

Schlösser, K,

Vénos, D,

Schlösser, M,

Franklin, G B,

Wolf, J,

Carney, R M D,

Karl, C,

Priester, F,

Bornschein, B,

Mark, M,

Saenz, A,

Engel, R,

Helbing, K,

Melzer, C,

Bornschein, L,

Slezák, M,

Sack, R,

Debowski, K,

Böttcher, M,

Glück, F,

Marsteller, A,

Schimpf, L,

Schneidewind, S,

Vizcaya Hernández, A P,

Brunst, T,

Behrens, J,

Köhler, C,

Tkachev, I,

Caldwell, T S,

Dragoun, O,

D Díaz Barrero,

Hillesheimer, D,

Valerius, K,

Gupta, V,

Lehnert, B,

Schaller, A,

W Xu,

Fulst, A,

Hinz, D,

Houdy, T,

Müller, K,

Schrank, M,

Kellerer, J,

Le, T L,

Enomoto, S,

Wendel, J,

Niemes, S,

Weinheimer, C,

Kel

2021

Overview

We report the results of the second measurement campaign of the Karlsruhe Tritium Neutrino (KATRIN) experiment. KATRIN probes the effective electron anti-neutrino mass, \\(m_\\), via a high-precision measurement of the tritium \\(\\)-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 \\(m_\\) of \\(0.7\\,eV/c^2\\) 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 \\(m_^2 = (0.260.34)\\,eV^4/c^4\\), resulting in an upper limit of \\(m_<0.9\\,eV/c^2\\) (\\(90\\,\\%\\) CL). By combining this result with the first neutrino mass campaign, we find an upper limit of \\(m_<0.8\\,eV/c^2\\) (\\(90\\,\\%\\) CL).

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Publisher

Cornell University Library, arXiv.org

Subject

Beta decay

/ Confidence intervals

/ Neutrinos

/ Sensitivity

/ Tritium