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 
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
