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

by Spinnor
Tags: diagram, exchange, feynman, gluon, horizontal, time
Spinnor is offline
Dec21-13, 04:47 PM
P: 1,361
Consider the Feynman diagram below from,


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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mfb is online now
Dec21-13, 05:24 PM
P: 10,801
You could label it blue anti-green as well, the "direction" of color flow can (and has to) be seen from the quarks if the diagram is drawn like this.

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