Study of the sign change of the Sivers function from STAR Collaboration W/Z production data
Abstract
Recent data on the transverse single spin asymmetry AN measured by the STAR Collaboration for p \, p W/Z0 \, X reactions at RHIC allow the first investigation of the Sivers function in Drell-Yan processes and of its expected sign change with respect to SIDIS processes. A new extraction of the Sivers functions from the latest SIDIS data is performed and a critical assessment of the significance of the STAR data is attempted.
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