Observation concerning the process dependence of the Sivers functions
Observation concerning the process dependence of the Sivers functions
The ${k}_{\ensuremath{\perp}}$ moment of a quark's Sivers function is known to be related to the corresponding twist-three quark-gluon correlation function ${T}_{q,F}(x,x)$. The two functions have been extracted from data for single-spin asymmetries in semi-inclusive deep-inelastic scattering and in single-inclusive hadron production in $pp$ collisions, respectively. Performing a consistent comparison of …