Modified expansion for virtual Compton amplitude

From considerations of analyticity and convergence it is shown that the virtual Compton amplitude can be expanded as T_μν(q₀,dots)Σn^wⁿC_μν⁽ⁿ⁾(...), where the variable w is obtained by conformally mapping the cut plane of analyticity in q₀ into the inside of a semi-infinite strip. This expansion reduces to the usual Bjorken expansion in the limit of large q₀.