Calculation of Transverse-Momentum-Dependent Evolution for Sivers Transverse Single Spin Asymmetry Measurements

S. Mert Aybat, Alexei Prokudin, and Ted C. Rogers
Phys. Rev. Lett. 108, 242003 – Published 13 June 2012

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.

  • Figure
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  • Received 9 March 2012

DOI:https://doi.org/10.1103/PhysRevLett.108.242003

© 2012 American Physical Society

Authors & Affiliations

S. Mert Aybat1, Alexei Prokudin2, and Ted C. Rogers3

  • 1Nikhef Theory Group, Science Park 105, 1098XG Amsterdam, The Netherlands
  • 2Jefferson Lab, 12000 Jefferson Avenue, Newport News, Virginia 23606, USA
  • 3C. N. Yang Institute for Theoretical Physics, Stony Brook University, Stony Brook, New York 11794-3840, USA

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Issue

Vol. 108, Iss. 24 — 15 June 2012

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