Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Cabibbo angle : an algebraic calculation   We show that the Cabibbo angle theta\_c satisfies the relation tan(2
theta\_c)=-+/- 1/2 when universality for diagonal neutral currents of mass
eigenstates is satisfied at the same level of accuracy as the absence of their
off-diagonal counterparts. The predicted value is cos theta\_c \approx 0.9732,
only 7/10000 away from experimental results. No mass ratio appears in the
calculation. theta\_c occurs a priori for both quark species, and, showing that
one recovers the standard dependence of leptonic and semi-leptonic decays of
pseudoscalar mesons, we advocate, like for neutrinos and charged leptons, for a
symmetrical treatment of u and d-type quarks.

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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: physics
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The categories of this paper are: chao-dyn
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc