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This study delves into frequently used expressions in leading quark distributions, QCD evolution, and flavor singlet combinations, with coupled equations for evolution. Data from CERN, SLAC, and HERMES are analyzed, along with the isotopic SU(2) invariance of strong interactions. The research presents sum rules and experiment findings, highlighting the determination of varied elements as matrix elements of conserved currents. The intriguing Spin "puzzle" is also discussed.
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Details: frequently used expressions AramKotzinian
Leading quark distributions For gluons we have AramKotzinian
QCD evolution AramKotzinian
Evolution equations For flavor singlet combinations we have coupled equations: AramKotzinian
First momentum AramKotzinian
Data from CERN, SLAC & HERMES AramKotzinian
The isotopic SU(2) invariance of strong interactions, We have two sum rules and can express AramKotzinian
Experiment: AramKotzinian
are determined as matrix elements of conserved currents and do not depend on AramKotzinian
Remember: Spin “puzzle”: or ???? AramKotzinian