Valence quark distributions in the pion
作者： M. B. Hecht , C. D. Roberts , S. M. Schmidt
DOI: 10.1103/PHYSREVC.63.025213
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摘要: We calculate the pion's valence-quark momentum-fraction probability distribution using a Dyson-Schwinger equation model. Valence quarks with an active mass of 0.30 GeV carry 71% momentum at resolving scale q{sub 0}=0.54 GeV=1/(0.37 fm). The shape calculated is characteristic strongly bound system and, evolved from 0} to q=2 GeV, it yields first, second, and third moments in agreement lattice phenomenological estimates, valence-quarks carrying 49% momentum. However, pointwise there discrepancy between our that hitherto inferred parametrizations extant pion-nucleon Drell-Yan data.
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