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

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

doi:10.1103/PhysRevLett.108.242003

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

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

Division of Science (Berks)

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80 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 language	English (US)
Article number	242003
Journal	Physical review letters
Volume	108
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevLett.108.242003
State	Published - Jun 13 2012

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.108.242003

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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.",

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AB - 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.

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

Abstract

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