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  "authors": [
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      "affiliations": [
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          "country": "USA", 
          "value": "Center for the Fundamental Laws of Nature, Jefferson Physical Laboratory, Harvard University, Cambridge, MA, 02138, USA", 
          "organization": "Harvard University"
        }, 
        {
          "country": "USA", 
          "value": "Physics Department, Harvard University, 17 Oxford St, Cambridge, MA, 02138, USA", 
          "organization": "Harvard University"
        }
      ], 
      "surname": "Georgi", 
      "email": "hgeorgi@fas.harvard.edu", 
      "full_name": "Georgi, Howard", 
      "given_names": "Howard"
    }
  ], 
  "titles": [
    {
      "source": "Springer", 
      "title": "Mass perturbation theory in the 2-flavor Schwinger model with opposite masses with a review of the background"
    }
  ], 
  "dois": [
    {
      "value": "10.1007/JHEP10(2022)119"
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      "page_end": "18", 
      "journal_title": "Journal of High Energy Physics", 
      "material": "article", 
      "journal_volume": "2022", 
      "artid": "JHEP10(2022)119", 
      "year": 2022, 
      "page_start": "1", 
      "journal_issue": "10"
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  "copyright": [
    {
      "holder": "The Author(s)", 
      "year": "2022"
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  "arxiv_eprints": [
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      "value": "2206.14691"
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  "abstracts": [
    {
      "source": "Springer", 
      "value": "I discuss the 2-flavor Schwinger model with \u03b8 = 0 and small equal and opposite fermion masses (or \u03b8 = \u03c0 with equal masses). The massless model has an unparticle sector with unbroken conformal symmetry. I argue that this special mass term modifies the conformal sector without breaking the conformal symmetry. I show in detail how mass-perturbation-theory works for correlators of flavor-diagonal fermion scalar bilinears. The result provides quantitative evidence that the theory has no mass gap for small non-zero fermion masses. The massive fermions are bound into conformally invariant unparticle stuff. I show how the long-distance conformal symmetry is maintained when small fermion masses are turned on and calculate the relevant scaling dimensions for small mass. I calculate the corrections to the 2- and 4-point functions of the fermion-bilinear scalars to leading order in perturbation theory in the fermion mass and describe a straightforward procedure to extend the calculation to all higher scalar correlators. I hope that this model is a useful and non-trivial example of unparticle physics, a sector with unbroken conformal symmetry coupled to interacting massive particles, in which we can analyze the particle physics in a consistent approximation."
    }
  ], 
  "imprints": [
    {
      "date": "2022-10-18", 
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