Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nucleon Decay in a Realistic SO(10) SUSY GUT   In this paper, we calculate neutron and proton decay rates and branching
ratios in a predictive SO(10) SUSY GUT which agrees well with low energy data.
We show that the nucleon lifetimes are consistent with the experimental bounds.
The nucleon decay rates are calculated using all one-loop chargino and gluino
dressed diagrams regardless of their chiral structure. We show that the
four-fermion operator $C_{jk} (u_R {d_j}_R)({d_k}_L {\nu_\tau}_L)$, commonly
neglected in previous nucleon decay calculations, not only contributes
significantly to nucleon decay, but, for many values of the initial GUT
parameters and for large $\tan\beta$, actually dominates the decay rate. As a
consequence, we find that $\tau_p/\tau_n$ is often substantially larger than
the prediction obtained in small $\tan\beta$ models. We also find that
gluino-dressed diagrams, often neglected in nucleon decay calculations,
contribute significantly to nucleon decay. In addition we find that the
branching ratios obtained from this realistic SO(10) SUSY GUT differ
significantly from the predictions obtained from ``generic" SU(5) SUSY GUTS.
Thus nucleon decay branching ratios, when observed, can be used to test
theories of fermion masses.

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The categories of this paper are: math
35
The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys