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  "authors": [
    {
      "affiliations": [
        {
          "country": "China", 
          "value": "School of Physics, Nankai University, Tianjin 300071, China"
        }
      ], 
      "surname": "Chen", 
      "email": "chenning_symmetry@nankai.edu.cn", 
      "full_name": "Chen,Ning", 
      "given_names": "Ning"
    }
  ], 
  "titles": [
    {
      "source": "IOP", 
      "title": "High-quality grand unified theories with three generations  "
    }
  ], 
  "dois": [
    {
      "value": "10.1088/1674-1137/ac5010"
    }
  ], 
  "publication_info": [
    {
      "journal_title": "Chinese Physics C", 
      "material": "article", 
      "journal_volume": "46", 
      "artid": "053107", 
      "year": 2022, 
      "journal_issue": "5"
    }
  ], 
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    "source": "IOP", 
    "method": "IOP", 
    "submission_number": "6ab8f560041a11ee8e62c23b20d38f61"
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  "page_nr": [
    10
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  "license": [
    {
      "url": "http://creativecommons.org/licenses/by/3.0/", 
      "license": "CC-BY-3.0"
    }
  ], 
  "copyright": [
    {
      "statement": "\u00a9 2022Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd", 
      "year": "2022"
    }
  ], 
  "control_number": "69508", 
  "record_creation_date": "2022-04-27T03:30:18.203615", 
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      "primary": "Chinese Physics C"
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  "arxiv_eprints": [
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      "categories": [
        "hep-ph", 
        "hep-th"
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      "value": "2108.08690"
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  "abstracts": [
    {
      "source": "IOP", 
      "value": "We extend the unitary groups beyond the   $SU(5)$   and   $SU(5)$   to determine possible grand unified theories that give rise to three-generational Standard Model fermions without simple repetitions. By demanding asymptotic free theories at short distances, we find gauge groups of   $SU(5)$  ,   $SU(5)$  , and   $SU(5)$  , together with their anomaly-free irreducible representations, are such candidates. Two additional gauge groups of   $SU(5)$   and   $SU(5)$   can also achieve the generational structure without asymptotic freedom. We also deduce that these models can solve the Peccei-Quinn (PQ) quality problem, which is intrinsic in the axion models, with the leading PQ-breaking operators determined from the symmetry requirement."
    }
  ], 
  "imprints": [
    {
      "date": "2022-05-01", 
      "publisher": "IOP"
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}