PoS - Proceedings of Science
Volume 284 - QCD Evolution 2016 (QCDEV2016) - Monday, May 30, 2016 - Morning 1
Quasi-real photon contribution to $A_N$ in $\ell p^\uparrow \to \pi\, X$ within a TMD approach
U. D'Alesio*, C. Flore and F. Murgia
Full text: pdf
Pre-published on: February 10, 2017
Published on: March 28, 2017
Within a TMD approach we discuss the impact of quasi-real (Weizs\"acker-Williams) photon contribution to the transverse single-spin asymmetry, $A_N$, for the inclusive process $\ell p^\uparrow \to \pi\, X$. This study extends a previous one where only the leading-order contribution was taken into account. Predictions are obtained adopting the Sivers and transversity distributions and the Collins fragmentation functions as extracted from fits to the azimuthal asymmetries measured in semi-inclusive deep inelastic scattering and $e^+e^-$ annihilation processes. The description of the available data is very good, showing a clear general improvement with respect to the previous analysis (already quite promising). This result represents a further step towards a unified TMD treatment of SSAs in $\ell\,p^\uparrow \to\ell'\, h\, X$ and $\ell \,p^\uparrow \to h\, X$ processes.
DOI: https://doi.org/10.22323/1.284.0002
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