Abstract
New data on the Sivers azimuthal asymmetry measured in semi-inclusive deepinelastic scattering processes have recently been released by the COMPASS Collaboration at CERN. Their increased precision and their particular binning, in terms of Q2 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- and large-x regions.
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Boglione, M., D’Alesio, U., Flore, C. et al. Assessing signals of TMD physics in SIDIS azimuthal asymmetries and in the extraction of the Sivers function. J. High Energ. Phys. 2018, 148 (2018). https://doi.org/10.1007/JHEP07(2018)148
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DOI: https://doi.org/10.1007/JHEP07(2018)148