Sivers function of sea quarks in the light-cone model

Abstract

We calculate the Sivers function of $\bar{u}$ and $\bar{d}$ quarks using the overlap representation within the light-cone formalism. The light-cone wave functions of the proton is obtained in terms of the $|\bar{q}qB⟩$ Fock states motivated by the meson-baryon fluctuation model. We consider the final-state interaction at the level of one gluon exchange. In a simplified scenario, the Sivers function of $\bar{u}$ and $\bar{d}$ can be expressed as the convolution of the Sivers function of the pion inside the proton and the unpolarized distribution of $\bar{q}$ inside the pion. The model parameters are fixed by fitting the unpolarized sea quark distributions to the known parameterizations. We present the numerical results for $f_1^{\perp \bar{u}/p}(x,{\mathbf{k}}_T^2)$ and $f_1^{\perp \bar{d}/p}(x,{\mathbf{k}}_T^2)$. The first transverse moment of the sea quark Sivers functions in our model are find to be negative and the magnitude is about 0.004 at most.

9 pages, figures

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Cited by in corpus (2)

• Several Topics on Transverse Momentum-Dependent Fragmentation Functions
• Generalized parton distributions of sea quark at zero skewness in the light-cone Model