I am confused about the very step from Eq.(14) to Eq.(15) in the paper(adsbygoogle = window.adsbygoogle || []).push({});

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!

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# About the gluon feild and propagator

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