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New theoretical contribution helps examine the internal rotation of the proton - EurekAlert
The quark Sivers function describes much of the physics of how quarks are distributed in a proton whose rotation is perpendicular to its direction of motion. This function shows whether more quarks in the proton move to the right than to the left of the plane created by the proton’s velocity and the direction of the proton’s rotation (spin) axis. Scientists have found a new theoretical contribution to the Sivers function of the quarks carrying a small fraction of the proton’s momentum.
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