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• PARTON SHOWER

• Here one breaks a parton (q, q, g) into 1 or more an arbitrary

• number of times (branching) to describe the appearance of

• multijet events

• No explicit upper limit on the # of partons involved

• q ® q g g ® g g g® q q

• DGLAP EVOLUTION EQUATIONS

• branching probability a ® b c for a small dt shift

• z specifies the sharing of momentum between b and c

• EVOLUTION PARAMETER

• dt = dQ2evol /Q2evol t = ln (Q2evol /L2)