Consider the Feynman diagram below from,(adsbygoogle = window.adsbygoogle || []).push({});

http://hyperphysics.phy-astr.gsu.edu/hbase/particles/expar.html

where I assume time runs upwards and the gluon in the graphic runs horizontal and is labled as a green_antiblue gluon. If the gluon runs horizontal can one still label a gluon as being green_antiblue? Only if the gluon is not horizontal can we specifically label it? Hope my question is not too confusing.

Thanks for any help!

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# Feynman diagram for gluon exchange, time up, gluon horizontal.

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