Generalized Power Counting Rule

In this talk, I will present a generalized power counting rule for the hard exclusive processes involving parton orbital angular momentum and hadron helicity flip. We introduce a systematic way to write down the Fock components of a hadronic light-cone wave function with $n$ partons and orbital angular momentum projection $l_z$, from which we derive the generalized counting rule. As an example, I will show the power counting result for the nucleon's Pauli form factor $F_2(Q^2)$ in perturbative QCD.