Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutrino tri-bi-maximal mixing from Delta(27)   The observed neutrino mixing, having a near maximal atmospheric neutrino
mixing angle and a large solar mixing angle, is close to tri-bi-maximal,
putting leptonic mixing in contrast with the small mixing of the quark sector.
We discuss a model in which Delta(27) (a subgroup of SU(3)) is the family
symmetry, and tri-bi-maximal mixing directly follows from the vacuum structure
enforced by the discrete symmetry. The model accounts for the observed quark
and lepton masses and the CKM matrix, as well as being consistent with an
underlying stage of Grand Unification.

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The categories of this paper are: chem-ph
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The categories of this paper are: physics
4
The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat