details: frequently used expressions
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Details: frequently used expressions
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For gluons we have
Leading quark distributions
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QCD evolution
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Evolution equations
For flavor singlet combinations we have coupled equations:
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First momentum
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Data from CERN, SLAC & HERMES
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The isotopic SU(2) invariance of strong interactions,
We have two sum rules and can express sggdu AA and , trought and 8
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Experiment:
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are determined as matrix elements of conserved currents and do not depend on 2Q
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Remember:
Spin “puzzle”: s or G ????
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