Author:
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.
Abstract
Abstract
A search for Beyond the Standard Model double-β decay modes of 76Ge 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
76Ge, with half-life values on the order of 1023 yr. For the first time with
76Ge, 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.
Subject
Astronomy and Astrophysics