Abstract
The Sivers transverse single spin asymmetry (TSSA) is calculated and compared at different scales using the transverse-momentum-dependent (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 nonperturbative 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 preliminary COMPASS measurements are consistent with the suppression prescribed by TMD evolution.
| Original language | English (US) |
|---|---|
| Article number | 242003 |
| Journal | Physical review letters |
| Volume | 108 |
| Issue number | 24 |
| DOIs | |
| State | Published - Jun 13 2012 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy
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