Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Novel Relations between Lepton and Quark Mixings   A novel relation is found which gives the 2-3 lepton mixing angle in terms of
quark masses and CKM mixing: \tan\theta_{\mu\tau}=(m_b/m_s)V_{cb}. This
relation, which is remarkably in good agreement with the quark data and the
large lepton mixing recently observed, is a kind of SO(10) GUT relation similar
to the celebrated bottom-tau mass ratio in SU(5). The GUT models in which this
relation hold should have a `twisted SO(10)' structure between the second and
third generations, in order to really explain the large lepton mixing, or
equivalently, the right-hand side of the relation.

34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys