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  "authors": [
    {
      "raw_name": "Graham D. Kribs", 
      "affiliations": [
        {
          "country": "USA", 
          "value": "Institute for Fundamental Science and Department of Physics, University of Oregon, Eugene, Oregon 97403, USA"
        }
      ], 
      "surname": "Kribs", 
      "given_names": "Graham D.", 
      "full_name": "Kribs, Graham D."
    }, 
    {
      "raw_name": "Xiaochuan Lu", 
      "affiliations": [
        {
          "country": "USA", 
          "value": "Institute for Fundamental Science and Department of Physics, University of Oregon, Eugene, Oregon 97403, USA"
        }
      ], 
      "surname": "Lu", 
      "given_names": "Xiaochuan", 
      "full_name": "Lu, Xiaochuan"
    }, 
    {
      "raw_name": "Adam Martin", 
      "affiliations": [
        {
          "country": "USA", 
          "value": "Department of Physics, University of Notre Dame, South Bend, Indiana 46556 USA"
        }
      ], 
      "surname": "Martin", 
      "given_names": "Adam", 
      "full_name": "Martin, Adam"
    }, 
    {
      "raw_name": "Tom Tong", 
      "affiliations": [
        {
          "country": "USA", 
          "value": "Institute for Fundamental Science and Department of Physics, University of Oregon, Eugene, Oregon 97403, USA"
        }, 
        {
          "country": "USA", 
          "value": "Amherst Center for Fundamental Interactions, Department of Physics, University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA"
        }
      ], 
      "surname": "Tong", 
      "given_names": "Tom", 
      "full_name": "Tong, Tom"
    }
  ], 
  "titles": [
    {
      "source": "APS", 
      "title": "Custodial symmetry violation in the SMEFT"
    }
  ], 
  "dois": [
    {
      "value": "10.1103/PhysRevD.104.056006"
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  "publication_info": [
    {
      "journal_volume": "104", 
      "journal_title": "Physical Review D", 
      "material": "article", 
      "journal_issue": "5", 
      "year": 2021
    }
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  "page_nr": [
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      "url": "https://creativecommons.org/licenses/by/4.0/", 
      "license": "CC-BY-4.0"
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  "copyright": [
    {
      "statement": "Published by the American Physical Society", 
      "year": "2021"
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  "record_creation_date": "2021-09-07T16:30:04.953741", 
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  "arxiv_eprints": [
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  "abstracts": [
    {
      "source": "APS", 
      "value": "We investigate precision observables sensitive to custodial-symmetric/-violating UV physics beyond the Standard Model. We use the Standard Model effective field theory (SMEFT) framework which in general includes nonoblique corrections that require a generalization of the Peskin-Takeuchi <math><mi>T</mi></math> parameter to unambiguously detect custodial symmetry/violation. We take a first step towards constructing a SMEFT reparametrization-invariant replacement, which we call <math><mi>\ud835\udcaf</mi></math>, valid at least for tree-level custodial-violating contributions. We utilize a new custodial basis of <math><mrow><mi>\u03bd</mi><mi>SMEFT</mi></mrow></math> (SMEFT augmented by right-handed neutrinos) which explicitly identifies the global <math><mi>S</mi><mi>U</mi><mo>(</mo><mn>2</mn><msub><mo>)</mo><mi>R</mi></msub></math> symmetries of the Higgs and fermion sectors, which in turn permits easy identification of higher-dimensional operators that are custodial preserving or violating. We carefully consider equation-of-motion redundancies that cause custodial-symmetric operators in one basis to be equivalent to a set of custodial-symmetric and/or -violating operators in another basis. Utilizing known results about tree/loop operator generation, we demonstrate that the basis-dependent appearance of custodial-violating operators does not invalidate our <math><mi>\ud835\udcaf</mi></math> parameter at tree level. We illustrate our results with several UV theory examples, demonstrating that <math><mi>\ud835\udcaf</mi></math> faithfully identifies custodial symmetry violation, while <math><mi>T</mi></math> can fail."
    }
  ], 
  "imprints": [
    {
      "date": "2021-09-07", 
      "publisher": "APS"
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}