New data on the Sivers azimuthal asymmetry measured in semi-inclusive deep- inelastic scattering processes have recently been released by the COMPASS Collaboration at CERN. Their increased precision and their particular binning, in terms of Q^2 as well as x, motivates a new extraction of the Sivers function, within the framework of a simple and transparent parametrization. Signals of TMD effects visible in the Sivers asymmetries are critically assessed. A thorough study of the uncertainties affecting the extracted Sivers function is presented, including the low-x and large-x regions.
Assessing signals of TMD physics in SIDIS azimuthal asymmetries and in the extraction of the Sivers function
Boglione, M.
;D'ALESIO, Umberto;Flore, C.;Gonzalez-Hernandez, J. O.
2018-01-01
Abstract
New data on the Sivers azimuthal asymmetry measured in semi-inclusive deep- inelastic scattering processes have recently been released by the COMPASS Collaboration at CERN. Their increased precision and their particular binning, in terms of Q^2 as well as x, motivates a new extraction of the Sivers function, within the framework of a simple and transparent parametrization. Signals of TMD effects visible in the Sivers asymmetries are critically assessed. A thorough study of the uncertainties affecting the extracted Sivers function is presented, including the low-x and large-x regions.File in questo prodotto:
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