Search for exotic physics in double-β decays with GERDA Phase II. Issue 12 (1st December 2022)

• Record Type: Journal Article
• Authors: 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.; Calgaro, S.; 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, J.; Hemmer, S.; Hofmann, W.; Huang, J.; Hult, M.; Inzhechik, L.V.; Janicskó Csáthy, J.; Jochum, J.; Junker, M.; Kazalov, V.; Kermaïdic, Y.; Khushbakht, H.; Kihm, T.; Kilgus, K.; Kirpichnikov, I.V.; Klimenko, A.; Knöpfle, 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.;
• Is Part Of: Journal of cosmology and astroparticle physics. Volume 2022:Issue 12(2022)
• Publication Date: 2022-12-01
• Subjects: double beta decay -- neutrino properties -- particle physics - cosmology connection; Cosmology -- Periodicals; Astrophysics -- Periodicals; 523.0105
• DOI: 10.1088/1475-7516/2022/12/012
• Languages: English
• ISSNs: 1475-7516

Abstract

Abstract: A search for Beyond the Standard Model double- β decay modes of 76 Ge has been performed with data collected during the Phase II of the GERmanium Detector Array (Gerda ) experiment, located at the 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- β decay have been obtained. The isotropic coefficient åof (3), which embeds Lorentz violation in double- β 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- β decay, including sterile neutrinos.