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We calculate the single-spin asymmetries $A^{W^{\pm}}_{N}$ of $W^{\pm}$bosons produced in transversely polarized pp collisions with the valence partof the up (u) and down (d) quark Sivers functions treated by an availableparametrization and the light-cone quark spectator-diquark model respectively,while the sea part Sivers functions of u and d quarks treated asparametrization. Comparing our results with those from experimental data atRHIC, we find that the Sivers functions of sea quarks play an important role inthe determination of the shapes of $A^{W^{\pm}}_{N}$. It is shown that$A^{W^{-}}_{N}$ is sensitive to u sea Sivers function, while $A^{W^{+}}_{N}$ tod sea Sivers function intuitively. The results show that the contributions of uand d sea Sivers functions are rather sizable and of the same sign, and theirsigns agree with that of d valence quarks and are opposite to that of u valencequarks.

Effect of sea quarks on single-spin asymmetries $A^{W^{\pm}}_{N}$ in transversely polarized pp collisions at RHIC