Dr Caroline Fengler: Publications

Direct neutrino-mass measurement based on 259 days of KATRIN data.

Science (New York, N.Y.) 388:6743 (2025) 180-185

Authors:

KATRIN Collaboration†, Max Aker, Dominic Batzler, Armen Beglarian, Jan Behrens, Justus Beisenkötter, Matteo Biassoni, Benedikt Bieringer, Yanina Biondi, Fabian Block, Steffen Bobien, Matthias Böttcher, Beate Bornschein, Lutz Bornschein, Tom S Caldwell, Marco Carminati, Auttakit Chatrabhuti, Suren Chilingaryan, Byron A Daniel, Karol Debowski, Martin Descher, Deseada Díaz Barrero, Peter J Doe, Otokar Dragoun, Guido Drexlin, Frank Edzards, Klaus Eitel, Enrico Ellinger, Ralph Engel, Sanshiro Enomoto, Arne Felden, Caroline Fengler, Carlo Fiorini, Joseph A Formaggio, Christian Forstner, Florian M Fränkle, Kevin Gauda, Andrew S Gavin, Woosik Gil, Ferenc Glück, Steffen Grohmann, Robin Grössle, Rainer Gumbsheimer, Nathanael Gutknecht, Volker Hannen, Leonard Hasselmann, Norman Haußmann, Klaus Helbing, Hanna Henke, Svenja Heyns, Stephanie Hickford, Roman Hiller, David Hillesheimer, Dominic Hinz, Thomas Höhn, Anton Huber, Alexander Jansen, Christian Karl, Jonas Kellerer, Khanchai Khosonthongkee, Matthias Kleifges, Manuel Klein, Joshua Kohpeiß, Christoph Köhler, Leonard Köllenberger, Andreas Kopmann, Neven Kovač, Alojz Kovalík, Holger Krause, Luisa La Cascio, Thierry Lasserre, Joscha Lauer, Thanh-Long Le, Ondřej Lebeda, Bjoern Lehnert, Gen Li, Alexey Lokhov, Moritz Machatschek, Martin Mark, Alexander Marsteller, Eric L Martin, Christin Melzer, Susanne Mertens, Shailaja Mohanty, Jalal Mostafa, Klaus Müller, Andrea Nava, Holger Neumann, Simon Niemes, Anthony Onillon, Diana S Parno, Maura Pavan, Udomsilp Pinsook, Alan WP Poon, Jose Manuel Lopez Poyato, Stefano Pozzi, Florian Priester, Jan Ráliš, Shivani Ramachandran, RG Hamish Robertson, Caroline Rodenbeck, Marco Röllig, Carsten Röttele, Milos Ryšavý, Rudolf Sack, Alejandro Saenz, Richard Salomon, Peter Schäfer, Magnus Schlösser, Klaus Schlösser, Lisa Schlüter, Sonja Schneidewind, Ulrich Schnurr, Michael Schrank, Jannis Schürmann, Ann-Kathrin Schütz, Alessandro Schwemmer, Adrian Schwenck, Michal Šefčík, Daniel Siegmann, Frank Simon, Felix Spanier, Daniela Spreng, Warintorn Sreethawong, Markus Steidl, Jaroslav Štorek, Xaver Stribl, Michael Sturm, Narumon Suwonjandee, Nicholas Tan Jerome, Helmut H Telle, Larisa A Thorne, Thomas Thümmler, Simon Tirolf, Nikita Titov, Igor Tkachev, Korbinian Urban, Kathrin Valerius, Drahoslav Vénos, Christian Weinheimer, Stefan Welte, Jürgen Wendel, Christoph Wiesinger, John F Wilkerson, Joachim Wolf, Sascha Wüstling, Johanna Wydra, Weiran Xu, Sergey Zadorozhny, Genrich Zeller

Abstract:

That neutrinos carry a nonvanishing rest mass is evidence of physics beyond the Standard Model of elementary particles. Their absolute mass holds relevance in fields from particle physics to cosmology. We report on the search for the effective electron antineutrino mass with the KATRIN experiment. KATRIN performs precision spectroscopy of the tritium β-decay close to the kinematic endpoint. On the basis of the first five measurement campaigns, we derived a best-fit value of [Formula: see text] eV², resulting in an upper limit of m_ν < 0.45 eV at 90% confidence level. Stemming from 36 million electrons collected in 259 measurement days, a substantial reduction of the background level, and improved systematic uncertainties, this result tightens KATRIN's previous bound by a factor of almost two.

Sterile-neutrino search based on 259 days of KATRIN data

ArXiv 2503.18667 (2025)

Authors:

Himal Acharya, Max Aker, Dominic Batzler, Armen Beglarian, Justus Beisenkötter, Matteo Biassoni, Benedikt Bieringer, Yanina Biondi, Matthias Böttcher, Beate Bornschein, Lutz Bornschein, Marco Carminati, Auttakit Chatrabhuti, Suren Chilingaryan, Deseada Díaz Barrero, Byron A Daniel, Martin Descher, Otokar Dragoun, Guido Drexlin, Frank Edzards, Klaus Eitel, Enrico Ellinger, Ralph Engel, Sanshiro Enomoto, Luca Fallböhmer, Arne Felden, Caroline Fengler, Carlo Fiorini, Joseph A Formaggio, Christian Forstner, Florian M Fränkle, Giulio Gagliardi, Kevin Gauda, Andrew S Gavin, Woosik Gil, Ferenc Glück, Robin Grössle, Thomas Höhn, Khushbakht Habib, Volker Hannen, Leonard Haßelmann, Klaus Helbing, Hanna Henke, Svenja Heyns, Roman Hiller, David Hillesheimer, Dominic Hinz, Alexander Jansen, Christoph Köhler, Khanchai Khosonthongkee, Joshua Kohpeiß, Leonard Köllenberger, Andreas Kopmann, Neven Kovač, Luisa La Cascio, Leo Laschinger, Thierry Lasserre, Joscha Lauer, Thanh-Long Le, Ondřej Lebeda, Bjoern Lehnert, Alexey Lokhov, Moritz Machatschek, Alexander Marsteller, Eric L Martin, Kirsten McMichael, Christin Melzer, Lukas Erik Mettler, Susanne Mertens, Shailaja Mohanty, Jalal Mostafa, Immanuel Müller, Andrea Nava, Holger Neumann, Simon Niemes, Irene Nutini, Anthony Onillon, Diana S Parno, Maura Pavan, Udomsilp Pinsook, Jan Plößner, Alan WP Poon, Jose Manuel Lopez Poyato, Florian Priester, Jan Ráliš, Marco Röllig, Shivani Ramachandran, RG Hamish Robertson, Caroline Rodenbeck, Rudolf Sack, Alejandro Saenz, Richard Salomon, Jannis Schürmann, Peter Schäfer, Ann-Kathrin Schütz, Magnus Schlösser, Lisa Schlüter, Sonja Schneidewind, Ulrich Schnurr, Alessandro Schwemmer, Adrian Schwenck, Michal Šefčík, Jakkapat Seeyangnok, Daniel Siegmann, Frank Simon, Julanan Songwadhana, Felix Spanier, Daniela Spreng, Warintorn Sreethawong, Markus Steidl, Jaroslav Štorek, Xaver Stribl, Michael Sturm, Narumon Suwonjandee, Nicholas Tan Jerome, Helmut HH Telle, Thomas Thümmler, Larisa A Thorne, Nikita Titov, Igor Tkachev, Kerstin Trost, Korbinian Urban, Drahoš Vénos, Kathrin Valerius, Sascha Wüstling, Christian Weinheimer, Stefan Welte, Jürgen Wendel, Christoph Wiesinger, John F Wilkerson, Joachim Wolf, Johanna Wydra, Weiran Xu, Sergey Zadorozhny, Genrich Zeller

Measurement of the inhomogeneity of the KATRIN tritium source electric potential by high-resolution spectroscopy of conversion electrons from $^{83m}$Kr

(2025)

Authors:

H Acharya, M Aker, D Batzler, A Beglarian, J BeisenkÃ¶tter, M Biassoni, B Bieringer, Y Biondi, F Block, B Bornschein, L Bornschein, M BÃ¶ttcher, M Carminati, A Chatrabhuti, S Chilingaryan, BA Daniel, M Descher, D DÃaz Barrero, O Dragoun, G Drexlin, F Edzards, K Eitel, E Ellinger, R Engel, S Enomoto, A Felden, C Fengler, C Fiorini, JA Formaggio, C Forstner, FM FrÃ¤nkle, G Gagliardi, K Gauda, AS Gavin, W Gil, F GlÃ¼ck, R GrÃ¶Ãle, V Gupta, K Habib, V Hannen, L Hasselmann, K Helbing, S Heyns, R Hiller, D Hillesheimer, D Hinz, T HÃ¶hn, A Huber, A Jansen, K Khosonthongkee, M Klein, J KohpeiÃ, C KÃ¶hler, A Kopmann, N Kovac, L La Cascio, L Laschinger, T Lasserre, J Lauer, TL Le, O Lebeda, B Lehnert, A Lokhov, M Machatschek, M Mark, A Marsteller, EL Martin, K McMichael, C Melzer, S Mertens, S Mohanty, J Mostafa, A Nava, H Neumann, S Niemes, I Nutini, A Onillon, R Ostertag, DS Parno, U Pinsook, J PlÃ¶Ãner, AWP Poon, JML Poyato, F Priester, J RÃ¡liÅ¡, S Ramachandran, RGH Robertson, C Rodenbeck, M RÃ¶llig, R Sack, A Saenz, R Salomon, P SchÃ¤fer, M SlezÃ¡k, K SchlÃ¶sser, M SchlÃ¶sser, L SchlÃ¼ter, S Schneidewind, U Schnurr, J SchÃ¼rmann, AK SchÃ¼tz, A Schwemmer, A Schwenck, J Seeyangnok, M Å efÄÃk, D Siegmann, F Simon, J Songwadhana, F Spanier, D Spreng, W Sreethawong, M Steidl, J Å torek, X Stribl, M Sturm, N Suwonjandee, N Tan Jerome, HH Telle, LA Thorne, T ThÃ¼mmler, K Trost, K Valerius, D VÃ©nos, C Weinheimer, S Welte, J Wendel, C Wiesinger, JF Wilkerson, J Wolf, S WÃ¼stling, J Wydra, W Xu, G Zeller

Measurement of the electric potential and the magnetic field in the shifted analysing plane of the KATRIN experiment

European Physical Journal C SpringerOpen 84:12 (2024) 1258

Authors:

M Aker, D Batzler, A Beglarian, J Behrens, J Beisenkötter, M Biassoni, B Bieringer, Y Biondi, F Block, S Bobien, M Böttcher, B Bornschein, L Bornschein, Ts Caldwell, M Carminati, A Chatrabhuti, S Chilingaryan, Ba Daniel, K Debowski, M Descher, D Díaz Barrero, Pj Doe, O Dragoun, G Drexlin, F Edzards, K Eitel, E Ellinger, R Engel, S Enomoto, A Felden, C Fengler, C Fiorini, Ja Formaggio, C Forstner, Fm Fränkle, K Gauda, As Gavin, W Gil, F Glück, R Grössle, R Gumbsheimer, V Hannen, L Hasselmann, N Haußmann, K Helbing, S Heyns, S Hickford, R Hiller

Abstract:

The projected sensitivity of the effective electron neutrino-mass measurement with the KATRIN experiment is below 0.3 eV (90 % CL) after 5 years of data acquisition. The sensitivity is affected by the increased rate of the background electrons from KATRIN’s main spectrometer. A special shifted-analysing-plane (SAP) configuration was developed to reduce this background by a factor of two. The complex layout of electromagnetic fields in the SAP configuration requires a robust method of estimating these fields. We present in this paper a dedicated calibration measurement of the fields using conversion electrons of gaseous^83mKr, which enables the neutrino-mass measurements in the SAP configuration.

First constraints on general neutrino interactions based on KATRIN data

(2024)

Authors:

M Aker, D Batzler, A Beglarian, J BeisenkÃ¶tter, M Biassoni, B Bieringer, Y Biondi, F Block, B Bornschein, L Bornschein, M BÃ¶ttcher, M Carminati, A Chatrabhuti, S Chilingaryan, BA Daniel, M Descher, D DÃaz Barrero, PJ Doe, O Dragoun, G Drexlin, F Edzards, K Eitel, E Ellinger, R Engel, S Enomoto, A Felden, C Fengler, C Fiorini, JA Formaggio, C Forstner, FM FrÃ¤nkle, G Gagliardi, K Gauda, AS Gavin, W Gil, F GlÃ¼ck, R GrÃ¶ssle, N Gutknecht, V Hannen, L Hasselmann, K Helbing, H Henke, S Heyns, R Hiller, D Hillesheimer, D Hinz, T HÃ¶hn, A Huber, A Jansen, K Khosonthongkee, C KÃ¶hler, L KÃ¶llenberger, A Kopmann, N KovaÄ, L La Cascio, T Lasserre, J Lauer, TL Le, O Lebeda, B Lehnert, G Li, A Lokhov, M Machatschek, M Mark, A Marsteller, K McMichael, C Melzer, S Mertens, S Mohanty, J Mostafa, K MÃ¼ller, A Nava, H Neumann, S Niemes, A Onillon, DS Parno, M Pavan, U Pinsook, AWP Poon, JML Poyato, F Priester, J RÃ¡liÅ¡, S Ramachandran, RGH Robertson, C Rodenbeck, M RÃ¶llig, R Sack, A Saenz, R Salomon, P SchÃ¤fer, K SchlÃ¶sser, M SchlÃ¶sser, L SchlÃ¼ter, S Schneidewind, M Schrank, J SchÃ¼rmann, AK SchÃ¼tz, A Schwemmer, A Schwenck, J Seeyangnok, M Å efÄÃk, D Siegmann, F Simon, J Songwadhana, F Spanier, D Spreng, W Sreethawong, M Steidl, J Å torek, X Stribl, M Sturm, N Suwonjandee, N Tan Jerome, HH Telle, LA Thorne, T ThÃ¼mmler, N Titov, I Tkachev, K Urban, K Valerius, D VÃ©nos, C Weinheimer, S Welte, J Wendel, M Wetter, C Wiesinger, JF Wilkerson, J Wolf, S WÃ¼stling, J Wydra, W Xu, S Zadorozhny, G Zeller

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