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arXiv · 2201.07870

Parton distributions of light quarks and antiquarks in the proton

Lei Chang·Fei Gao·Craig D. Roberts
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Abstract

An algebraic Ansatz for the proton's Poincaré-covariant wave function, which includes both scalar and pseudovector diquark correlations, is used to calculate proton valence, sea, and glue distribution functions (DFs). Regarding contemporary data, a material pseudovector diquark component in the proton is necessary for an explanation of the neutron-proton structure function ratio; and a modest Pauli blocking effect in the gluon splitting function is sufficient to explain the proton's light-quark antimatter asymmetry. In comparison with pion DFs, the light-front momentum fractions carried by all identifiable parton classes are the same; on the other hand, the higher moments are different. Understanding these features may provide insights that explain distinctions between Nambu-Goldstone bosons and seemingly less complex hadrons.

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Lei Chang, Fei Gao, Craig D. Roberts. 2022-02-28. Parton distributions of light quarks and antiquarks in the proton. https://doi.org/10.1016/j.physletb.2022.137078

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