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arXiv · 1112.4423

Calculation of TMD Evolution for Transverse Single Spin Asymmetry Measurements

S. Mert Aybat·Alexei Prokudin·Ted C. Rogers
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Abstract

The Sivers transverse single spin asymmetry (TSSA) is calculated and compared at different scales using the TMD evolution equations applied to previously existing extractions. We apply the Collins-Soper-Sterman (CSS) formalism, using the version recently developed by Collins. Our calculations rely on the universality properties of TMD-functions that follow from the TMD-factorization theorem. Accordingly, the non-perturbative input is fixed by earlier experimental measurements, including both polarized semi-inclusive deep inelastic scattering (SIDIS) and unpolarized Drell-Yan (DY) scattering. It is shown that recent COMPASS measurements are consistent with the suppression prescribed by TMD evolution.

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S. Mert Aybat, Alexei Prokudin, Ted C. Rogers. 2011-12-19. Calculation of TMD Evolution for Transverse Single Spin Asymmetry Measurements. https://doi.org/10.1103/physrevlett.108.242003

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