We analyze the Sivers asymmetry in the light-cone gauge. The average transverse momentum of the quark distribution is related to the correlation between the quark distribution and the transverse component of the gauge field at x^-=±∞. We then use finiteness conditions for the light-cone Hamiltonian to relate the transverse gauge field at x^-=±∞ to the color density integrated over x^-. This result allows us to relate the average transverse momentum of the active quark to color charge correlations in the transverse plane.
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Matthias Burkardt (2004) studied this question.
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