Neutrinoless double beta decay: searching for new physics with comparison of different nuclei

Abstract

The neutrinoless double beta decay is analyzed using a general Lorentz invariant effective Lagrangian for various decaying nuclei of current experimental interest: ${}^{76}$Ge, ${}^{82}$Se, ${}^{100}$Mo, ${}^{130}$Te, and ${}^{136}$Xe. We work out the half-lives and angular correlation coefficients of the outgoing electrons in several scenarios for new physics: the left-right symmetric models, the R-parity-violating SUSY and models with leptoquarks. The theoretical uncertainty in the nuclear matrix elements is discussed.

Comments: 3 pages, 2 tables; a talk given at the 14th Lomonosov Conference on Elementary Particle Physics (Moscow, August 19--25, 2009), an abridged version of the paper published in Phys. Atom. Nucl. 73 (2010) 2083--2096