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

  1. Dec 21, 2013 #1
    Consider the Feynman diagram below from,

    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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  2. jcsd
  3. Dec 21, 2013 #2

    mfb

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    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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