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About the gluon feild and propagator 
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#1
Aug914, 03:50 AM

P: 8

I am confused about the very step from Eq.(14) to Eq.(15) in the paper
http://arxiv.org/pdf/hepph/0308157.pdf There is one ##ig## in (14), while ##(ig)^2## in (15), where does it come from? Regards! 


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