http://upload.wikimedia.org/wikipedia/commons/1/1f/Feynmann_Diagram_Gluon_Radiation.svg
Why does the arrow of the positron doesn't show upwards?
Answer
The arrow is related to the flow of charge, not the direction of motion. So for antimatter they go the opposite way.
Or as some are fond of saying, the positron is like an electron moving backwards in time.
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