Search for exotic physics in double-β decays with GERDA Phase II

The GERDA Collaboration; Agostini, M.; Alexander, A.; Araujo, G.; Bakalyarov, A. M.; Balata, M.; Barabanov, I.; Baudis, L.; Bauer, C.; Belogurov, S.; Bettini, A.; Bezrukov, L.; Biancacci, V.; Bossio, E.; Bothe, V.; Brugnera, R.; Caldwell, A.; Cattadori, C.; Chernogorov, A.; Comellato, T.; D'Andrea, V.; Demidova, E. V.; Di Giacinto, A.; Di Marco, N.; Doroshkevich, E.; Fischer, F.; Fomina, M.; Gangapshev, A.; Garfagnini, A.; Gooch, C.; Grabmayr, P.; Gurentsov, V.; Gusev, K.; Hakenmüller, Janina; Hemmer, S.; Hofmann, W.; Huang, J.; Hult, M.; Inzhechik, L. V.; Csáthy, J. Janicskó; Jochum, J.; Junker, M.; Kazalov, V.; Kermaïdic, Y.; Khushbakht, H.; Kihm, T.; Kilgus, K.; Kirpichnikov, I. V.; Klimenko, A.; Knoepfle, K. T.; Kochetov, O.; Kornoukhov, V. N.; Krause, P.; Kuzminov, V. V.; Laubenstein, M.; Lindner, M.; Lippi, I.; Lubashevskiy, A.; Lubsandorzhiev, B.; Lutter, G.; Macolino, C.; Majorovits, B.; Maneschg, W.; Manzanillas, L.; Marshall, G.; Miloradovic, M.; Mingazheva, R.; Misiaszek, M.; Morella, M.; Müller, Y.; Nemchenok, I.; Pandola, L.; Pelczar, K.; Pertoldi, L.; Piseri, P.; Pullia, A.; Ransom, C.; Rauscher, L.; Redchuk, M.; Riboldi, S.; Rumyantseva, N.; Sada, C.; Sailer, S.; Salamida, F.; Schönert, S.; Schreiner, J.; Schütt, M.; Schütz, A. -K.; Schulz, O.; Schwarz, M.; Schwingenheuer, B.; Selivanenko, O.; Shevchik, E.; Shirchenko, M.; Shtembari, L.; Simgen, H.; Smolnikov, A.; Stukov, D.; Vasenko, A. A.; Veresnikova, A.; Vignoli, C.; von Sturm, K.; Wester, T.; Wiesinger, C.; Wojcik, M.; Yanovich, E.; Zatschler, B.; Zhitnikov, I.; Zhukov, S. V.; Zinatulina, D.; Zschocke, A.; Zsigmond, A. J.; Zuber, K.; Zuzel, G.

doi:10.1088/1475-7516/2022/12/012

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Journal Article

Search for exotic physics in double-β decays with GERDA Phase II

MPS-Authors

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Hakenmüller, Janina
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Hofmann, W.
Prof. Werner Hofmann, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Knoepfle, K. T.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Lindner, M.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Schwingenheuer, B.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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https://iopscience.iop.org/article/10.1088/1475-7516/2022/12/012/pdf
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Citation

The GERDA Collaboration, Agostini, M., Alexander, A., Araujo, G., Bakalyarov, A. M., Balata, M., et al. (2022). Search for exotic physics in double-β decays with GERDA Phase II. Journal of Cosmology and Astroparticle Physics, 2022(12): 012. doi:10.1088/1475-7516/2022/12/012.

Cite as: https://hdl.handle.net/21.11116/0000-000B-4EC2-3

Abstract

A search for Beyond the Standard Model double-$\beta$ decay modes of
$^{76}$Ge has been performed with data collected during the Phase II of the
GERmanium Detector Array (GERDA) experiment, located at Laboratori Nazionali
del Gran Sasso of INFN (Italy). Improved limits on the decays involving
Majorons have been obtained, compared to previous experiments with $^{76}$Ge,
with half-life values on the order of 10$^{23}$ yr. For the first time with
$^{76}$Ge, limits on Lorentz invariance violation effects in double-$\beta$
decay have been obtained. The isotropic coefficient
$\mathring{a}_\text{of}^{(3)}$, which embeds Lorentz violation in
double-$\beta$ decay, has been constrained at the order of $10^{-6}$ GeV. We
also set the first experimental limits on the search for light exotic fermions
in double-$\beta$ decay, including sterile neutrinos.