Abstract
The higher-twist structure functions are calculated in QCD 1+1 and formal sum rules are derived. It is demonstrated that the sum rule for the first moment of ƒ 4 is violated if one restricts the integration to “experimental data” ( x > 0). However, the sum rule is valid if a δ-function at the origin is taken into account. The physical origin of this δ-function is clarified from the point of view of canonical light-cone quantization (“zero mode” for the “bad” component) as well as using dispersion relations (fixed pole). The coefficient of the δ-function can be calculated by means of these dispersion relations as well as by considering a slightly non-forward Compton amplitude instead of the usual forward amplitude.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
