Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-07-15
Phys.Rev.D72:094007,2005; Erratum-ibid.D72:099903,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 10 figures, version published in PRD, one figure and comments added
Scientific paper
10.1103/PhysRevD.72.094007
The most recent data on the weighted transverse single spin asymmetry $A_{UT}^{\sin(\phi_h-\phi_S)}$ from HERMES and COMPASS collaborations are analysed within LO parton model with unintegrated parton distribution and fragmentation functions; all transverse motions are taken into account, with exact kinematics, in the elementary interactions. The overall quality of the data is such that, for the first time, a rather well constrained extraction of the Sivers function for $u$ and $d$ quarks is possible and is performed. Comparisons with models are made. Based on the extracted Sivers functions, predictions for $A_{UT}^{\sin(\phi_h-\phi_S)}$ asymmetries at JLab are given; suggestions for further measurements at COMPASS, with a transversely polarized hydrogen target and selecting favourable kinematical ranges, are discussed. Predictions are also presented for Single Spin Asymmetries (SSA) in Drell-Yan processes at RHIC and GSI.
Anselmino Mauro
Boglione Maria
D'Alesio Umberto
Kotzinian Aram
Murgia Francesco
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