Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Grand unified theory constrained supersymmetry and neutrinoless double
  beta decay   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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The categories of this paper are: dg-ga
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio