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• HERWIG (Marchesini-Webber)

• Angular ordering done explicitly

• E = energy of the branching parton

• q = angle between daughters

• Eb = z Ea Ec = (1 - z) Ea

• Events studied in a frame where the 2 initial partons make a 900

• angle (x0 = 1)

• Evolution starts with Ea as the energy of one of these partons

• Ea2 = (E2x)max - at the end of the evolution the event is boosted back to CM frame of the initial partons