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I am searching for the equation for the radiation probability of a gluon from a quark. I need this for an explanation of the jet structure after a Z decay. Because I heard that hard gluons are radiated with small angles to the quark. This means the energy is focused in the directions of the both quark of the Z decay. Now I need the equation to show this in a talk, but it is unfortunetelly not easy to find the corresponding equation...

does anybody can help me?

best regards

florian