Constraining quark angular momentum through semi-inclusive measurements
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The determination of quark angular momentum requires the knowledge of the generalized parton distribution E in the forward limit. We assume a connection between this function and the Sivers transverse-momentum distribution, based on model calculations and theoretical considerations. Using this assumption, we show that it is possible to fit at the same time nucleon magnetic moments and semi-inclusive single-spin asymmetries. This imposes additional constraints on the Sivers function and opens a plausible way to quantifying quark angular momentum.
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Light sea-quark flavor asymmetry and angular momentum of the nucleon in a scalar-vector spectator model
A fitted light-front spectator model predicts sustained anti-down over anti-up quark enhancement at high x matching E906 data and computes the sea quarks' contribution to nucleon angular momentum.
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