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About the gluon feild and propagator

  1. Aug 9, 2014 #1
    I am confused about the very step from Eq.(14) to Eq.(15) in the paper
    http://arxiv.org/pdf/hep-ph/0308157.pdf
    There is one ##ig## in (14), while ##(ig)^2## in (15), where does it come from?
    Regards!
     
  2. jcsd
  3. Aug 13, 2014 #2
    I'm sorry you are not finding help at the moment. Is there any additional information you can share with us?
     
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