Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantization of hypercharge in gauge groups locally isomorphic but
  globally nonisomorphic to SU(3)_c X SU(2)_L X U(1)_Y   In the Standard Model the hypercharges of quarks and leptons are not
determined by the gauge group itself. In a recent paper [C. Hattori et al.
Phys. Rev. D83, 015009 (2011)] it is shown that, if the direct product gauge
group G_SM is slightly modified to the semidirect product group G'_SM,
hypercharges are restricted to quantized values as n/6 mod Z (n = 0,1,3,4). In
this brief paper, we examine all of the compact Lie groups locally isomorphic
to G_SM, and show that G'_SM (or its isomorphisms) is the unique possibility
that yields the correct hypercharge quantization.

14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph