The λ Mechanism of the 0νββ-Decay

Frontiers in Physics

Å tefá¹  Å imkovic, Fedor²  nik, DuÅ¡an³ 

[1] Boboliubov Laboratory of Theoretical Physics, Russia;Department of Nuclear Physics and Biophysics, Comenius University, Slovakia;Institute of Experimental and Applied Physics, Czech Technical University in Prague, Czechia

关键词: Majorana neutrinos;    neutrinoless double beta decay;    right-handed current;    left-right symmetric models;    nuclear matrix elements;    quasiparticle random phase approximation;   

DOI  :  10.3389/fphy.2017.00057

学科分类：物理（综合）

来源: Frontiers

【 摘 要 】

The lambda mechanism (WL-WR exchange) of the neutrinoless double beta decay (0nbb-decay), which has origin in left-right symmetric model with right-handed gauge boson at TeV scale, is investigated. The revisited formalism of the 0nbb-decay, which includes higher order terms of nucleon current, is exploited. The corresponding nuclear matrix elements are calculated within quasiparticle random phase approximation with partial restoration of the isospin symmetry for nuclei of experimental interest. A possibility to distinguish between the conventional light neutrino mass (WL-WL exchange) and lambda mechanisms by observation of the 0nbb-decay in several nuclei is discussed. A qualitative comparison of effective lepton number violating couplings associated with these two mechanisms is performed. By making viable assumption about the seesaw type mixing of light and heavy neutrinos it is concluded that there is a dominance of the conventional light neutrino mass mechanism in the decay rate.

【 授权许可】

CC BY