Grand unified theory constrained supersymmetry and neutrinoless double beta decay

Abstract

We analyze the contributions to the neutrinoless double $\beta$ decay ($0\nu \beta \beta$-decay) coming from the Grand Unified Theory (GUT) constrained Minimal Supersymmetric Standard Model (MSSM) with trilinear R-parity breaking. We discuss the importance of two-nucleon and pion-exchange realizations of the quark-level $0\nu \beta \beta$-decay transitions. In this context, the questions of reliability of the calculated relevant nuclear matrix elements within the Renormalized Quasiparticle Random Phase Approximation (pn-RQRPA) for several medium and heavy open-shell nuclei are addressed. The importance of gluino and neutralino contributions to $0\nu \beta \beta$-decay is also analyzed. We review the present experiments and deduce limits on the trilinear R-parity breaking parameter ${\lambda }_{111}^{\prime }$ from the non-observability of $0\nu \beta \beta$-decay for different GUT constrained SUSY scenarios. In addition, a detailed study of limits on the MSSM parameter space coming from the $B\to X_s\gamma$ processes by using the recent CLEO and OPAL results is performed. Some studies in respect to the future $0\nu \beta \beta$-decay project GENIUS are also presented.

arXiv comment29 pages, 8 figures

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• Test of Physics beyond the Standard Model in Nuclei
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• Pionic Contribution to Neutrinoless Double Beta Decay