Three-Quark Light-Cone Amplitudes of The Proton And Quark-Orbital-Motion Dependent Observables

Abstract

We study the three-quark light-cone amplitudes of the proton including quarks' transverse momenta. We classify these amplitudes using a newly-developed method in which light-cone wave functions are constructed from a class of light-cone matrix elements. We derive the constraints on the amplitudes from parity and time-reversal symmetries. We use the amplitudes to calculate the physical observables which vanish when the quark orbital angular momentum is absent. These include transverse-momentum dependent parton distributions $\Delta q_T(x,k_{\perp })$, $q_T(x,k_{\perp })$, $\delta q(x,k_{\perp })$, and $\delta q_L(x,k_{\perp })$, twist-three parton distributions $g_T(x)$ and $h_L(x)$, helicity-flip generalized parton distributions $E(x,\xi =0,Q^2)$ and its associates, and the Pauli form factor $F_2(Q^2)$.

arXiv comment20 pages, no figure

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