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Photon distribution amplitudes in QCD

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Title: Photon distribution amplitudes in QCD
Authors: Ball, Patricia1 patricia.ball@durham.ac.uk, Braun, V.M.2, Kivel, N.2
Source: Nuclear Physics B. Jan2003, Vol. 649 Issue 1/2, p263. 34p.
Subjects: Photon emission, Quantum chromodynamics
Abstract: We develop a consistent technique for the calculation of real photon emission in hard exclusive processes, which is based on the background field formalism and allows a convenient separation of hard electromagnetic and soft hadronic components of the photon. The latter ones are related to matrix-elements of light-cone operators in the electromagnetic background field and can be parametrized in terms of photon distribution amplitudes. We construct a complete set of photon distribution amplitudes up to and including twist-4, for both chirality-conserving and chirality-violating operators. The distribution amplitudes involve several non-perturbative parameters and, most importantly, the magnetic susceptibility of the quark condensate. We review and update previous estimates of the susceptibility and also give new estimates of parameters describing higher-twist amplitudes from QCD sum rules. [Copyright &y& Elsevier]
Copyright of Nuclear Physics B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 8723835
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
  Group: Ti
  Data: Photon distribution amplitudes in QCD
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  Data: <searchLink fieldCode="AR" term="%22Ball%2C+Patricia%22">Ball, Patricia</searchLink><relatesTo>1</relatesTo><i> patricia.ball@durham.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Braun%2C+V%2EM%2E%22">Braun, V.M.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Kivel%2C+N%2E%22">Kivel, N.</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Nuclear+Physics+B%22">Nuclear Physics B</searchLink>. Jan2003, Vol. 649 Issue 1/2, p263. 34p.
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  Data: <searchLink fieldCode="DE" term="%22Photon+emission%22">Photon emission</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+chromodynamics%22">Quantum chromodynamics</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: We develop a consistent technique for the calculation of real photon emission in hard exclusive processes, which is based on the background field formalism and allows a convenient separation of hard electromagnetic and soft hadronic components of the photon. The latter ones are related to matrix-elements of light-cone operators in the electromagnetic background field and can be parametrized in terms of photon distribution amplitudes. We construct a complete set of photon distribution amplitudes up to and including twist-4, for both chirality-conserving and chirality-violating operators. The distribution amplitudes involve several non-perturbative parameters and, most importantly, the magnetic susceptibility of the quark condensate. We review and update previous estimates of the susceptibility and also give new estimates of parameters describing higher-twist amplitudes from QCD sum rules. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nuclear Physics B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/S0550-3213(02)01017-9
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 34
        StartPage: 263
    Subjects:
      – SubjectFull: Photon emission
        Type: general
      – SubjectFull: Quantum chromodynamics
        Type: general
    Titles:
      – TitleFull: Photon distribution amplitudes in QCD
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Ball, Patricia
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            NameFull: Braun, V.M.
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            NameFull: Kivel, N.
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            – D: 20
              M: 01
              Text: Jan2003
              Type: published
              Y: 2003
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              Value: 649
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              Value: 1/2
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            – TitleFull: Nuclear Physics B
              Type: main
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