Study of the sign change of the Sivers function from STAR collaboration W/Z production data

Anselmino, M.;Boglione, M.;D'ALESIO, UMBERTO;Murgia, F.;Prokudin, A.

2017-01-01

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Abstract

Recent data on the transverse single spin asymmetry AN measured by the STAR Collaboration for p↑p → W±/Z0X 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.