Grand unified theory constrained supersymmetry and neutrinoless double beta decay

Details Grand unified theory constrained supersymmetry and neutrinoless double beta decay Grand unified theory constrained supersymmetry and neutrinoless double beta decay

1999-02-24

arxiv.org/abs/hep-ph/9902453v1

Phys.Rev. D60 (1999) 115007

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages, 8 figures

Scientific paper

10.1103/PhysRevD.60.115007

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 $\lambda_{111}'$ 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.

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