Calculation of transverse-momentum-dependent evolution for sivers transverse single spin asymmetry measurements

S. Mert Aybat, Alexei Prokudin, Ted C. Rogers

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73 Scopus citations

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 languageEnglish (US)
Article number242003
JournalPhysical review letters
Volume108
Issue number24
DOIs
StatePublished - Jun 13 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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