Single Spin Asymmetries in Charged Pion Production from Semi-Inclusive Deep Inelastic Scattering on a Transversely PolarizedHe<mml:mprescripts/><mml:none/>3Target atQ2=1.4–2.7 GeV2

2011/06/30 by X. Qian, K. Allada, C. Dutta +128 · 3 citations
Physics and Astronomy · #Deep inelastic scattering #Hadron #High-Energy Particle Collisions Research #Inelastic scattering #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Proton #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Scattering #Spin (aerodynamics) #hep-ex #hep-ph #nucl-ex #nucl-th

paper · pdf · doi:10.1103/physrevlett.107.072003

published as Phys.Rev.Lett.107:072003,2011 · 6 pages, 2 figures, 2 tables, published in PRL

openalex publication_date 2011/08/10 · arxiv created 2011/08/16 · arxiv updated 2011/08/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We report the first measurement of target single spin asymmetries in the semi-inclusive ³He(e,e^\ensuremath'\ensuremathπ^\ifmmode±\else\textpm\fi)X reaction on a transversely polarized target. The experiment, conducted at Jefferson Lab using a 5.9 GeV electron beam, covers a range of 0.16&lt;x&lt;0.35 with 1.4&lt;Q²&lt;2.7 GeV². The Collins and Sivers moments were extracted from the azimuthal angular dependence of the measured asymmetries. The \ensuremathπ^\ifmmode±\else\textpm\fi Collins moments for ³He are consistent with zero, except for the \ensuremathπ⁺ moment at x=0.35, which deviates from zero by 2.3\ensuremathσ. While the \ensuremathπ^\ensuremath- Sivers moments are consistent with zero, the \ensuremathπ⁺ Sivers moments favor negative values. The neutron results were extracted using the nucleon effective polarization and measured cross section ratios of proton to ³He, and are largely consistent with the predictions of phenomenological fits and quark model calculations.

Citations

• Fragmentation of transversely polarized quarks probed in transverse momentum distributions
• Three-quark light-cone amplitudes of the proton and quark orbital-motion-dependent observables
• Quark helicity flip generalized parton distributions from two-flavor lattice QCD
• Complete analysis of spin structure functiong1of3He
• Effects of transversity in deep-inelastic scattering by polarized protons
• Transverse momentum dependent parton distributions in a light-cone quark model
• Single-spin production asymmetries from the hard scattering of pointlike constituents
• Measurement of Azimuthal Asymmetries in Inclusive Production of Hadron Pairs ine+e−Annihilation at Belle

Cited by

• Transverse momentum dependent twist-three result for polarized Drell-Yan processes
• Final state interactions and the extraction of neutron single spin asymmetries from semi-inclusive deep-inelastic scattering by a transversely polarized He<mml:mprescripts/><mml:none/>3 target
• Measurement of Azimuthal Asymmetries in Inclusive Charged Dipion Production ine+e−Annihilations ats=3.65 GeV