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Moments of generalized parton distribution functions and the nucleon spin contents

Author:
Wakamatsu   M.  


Journal:
Physical Review D


Issue Date:
2005


Abstract(summary):

It is shown that, based only upon empirically and semiempirically known facts together with some reasonable theoretical postulates, we are inevitably led to a novel conclusion that the quark orbital angular momentum carries nearly half of the total nucleon spin at the low energy scale around Q 2sime(600 MeV) 2. We also perform an explicit model analysis to find that the quark spin fraction DeltaSigma is extremely sensitive to the pion mass, which may resolve the discrepancy between the observation and the prediction of the recent lattice QCD simulation carried out in the heavy pion region


Page:
074006


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