Model calculations of the Sivers function satisfying the Burkardt Sum Rule
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It is shown that, at variance with previous analyses, the MIT bag model can explain the available data of the Sivers function and satisfies the Burkardt Sum Rule to a few percent accuracy. The agreement is similar to the one recently found in the constituent quark model. Therefore, these two model calculations of the Sivers function are in agreement with the present experimental and theoretical wisdom.
9 pages, 4 figures; one figure added; references added; slightly revised version accepted for publication in Phys. Rev. D
9 pages, 4 figures; one figure added; references added; slightly revised version accepted for publication in Phys. Rev. D