Sivers vs. Collins effect in azimuthal single spin asymmetries in pion production in SIDIS

2003/03/31 by А. В. Ефремов, A. V. Efremov, K. Goeke +1 · 6 citations
Physics and Astronomy · #Asymmetry #Compass #Deep inelastic scattering #High-Energy Particle Collisions Research #Inelastic scattering #Lepton #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Parton #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Scattering #Spin (aerodynamics) #Transverse plane #Twist #hep-ph

paper · pdf · doi:10.1016/j.physletb.2003.06.016

published as Phys.Lett. B568 (2003) 63-72 · 8 pages, 4 figures. References added, small changes in text, Appendix added

openalex publication_date 2003/07/16 · arxiv created 2003/07/24 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Recently it has been argued that the transverse momentum dependent twist-2 Sivers distribution function does not vanish in QCD. Therefore both, the Collins and Sivers effects, should be considered in order to explain the azimuthal single spin asymmetries A(UL) in pion production in semi-inclusive deeply inelastic lepton scattering of a longitudinally polarized target. On the basis of presently available phenomenological information on the Sivers function we estimate that for those asymmetries A(UL) in the kinematic region of the HERMES experiments the Sivers effect can be neglected with respect to the Collins effect. It is argued that the same feature holds also for the COMPASS and CLAS experiments. This justifies theoretical approaches to understand the HERMES data on the basis of the Collins effect only.

Citations

• T-odd quark distributions: QCD versus chiral models
• Fragmentation of transversely polarized quarks probed in transverse momentum distributions
• Estimate of a chiral-odd contribution to single transverse-spin asymmetry in hadronic pion production
• Nucleon parton distributions at low normalization point in the large Nc limit
• Bounds on Transverse Momentum Dependent Distribution and Fragmentation Functions
• Reanalysis of azimuthal spin asymmetries of meson electroproduction
• Initial-state interactions in the unpolarized Drell-Yan process
• Single-spin production asymmetries from the hard scattering of pointlike constituents

Cited by

• Are there approximate relations among transverse momentum dependent distribution functions?
• Sivers effect in semi-inclusive DIS and in the Drell–Yan process
• Monte Carlo simulation of events with Drell-Yan lepton pairs from antiproton-proton collisions
• Transversity distribution in spin asymmetries in semi-inclusive DIS and in the Drell-Yan process
• Transverse momentum dependent distribution functionh1T⊥and the single spin asymmetryAUTsin(3ϕ−3S)
• Single Transverse Spin Asymmetries at Parton Level