Azimuthal Spin Asymmetries of Pion Electroproduction

Abstract

Azimuthal spin asymmetries, both for charged and neutral pion production in semi-inclusive deep inelastic scattering of unpolarized charged lepton beams on longitudinally and transversely polarized nucleon targets, are analyzed and calculated. Various assumptions and approximations in the quark distributions and fragmentation functions often used in these calculations are studied in detail. It is found that different approaches to the distribution and fragmentation functions may lead to quite different predictions on the azimuthal asymmetries measured in the HERMES experiments, thus their effects should be taken into account before using the available data as a measurement of quark transversity distributions. It is also found that the unfavored quark to pion fragmentation functions must be taken into account for ${\pi }^{-}$ production from a proton target, although they can be neglected for ${\pi }^{+}$ and ${\pi }^0$ production. Pion production from a proton target is suitable to study the $u$ quark transversity distribution, whereas a combination of pion production from both proton and neutron targets can measure the flavor structure of quark transversity distributions.

31 latex pages, 13 figure, to appear in PRD

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• Melosh rotation: source of the proton's missing spin
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Cited by in corpus (40)

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• Three-Quark Light-Cone Amplitudes of The Proton And Quark-Orbital-Motion Dependent Observables
• Pretzelosity $h_{1T}^{\perp }$ and quark orbital angular momentum
• Collins effect in semi-inclusive deeply inelastic scattering and in electron positron annihilation
• Sivers function in light-cone quark model and azimuthal spin asymmetries in pion electroproduction
• Estimate of the Collins fragmentation function in a chiral invariant approach
• Sivers effect in Drell Yan at RHIC
• Semi-Inclusive Deep Inelastic Scattering in Wandzura-Wilczek-type approximation
• Are there approximate relations among transverse momentum dependent distribution functions?
• Sivers vs. Collins effect in azimuthal single spin asymmetries in pion production in SIDIS
• Reanalysis of Azimuthal Spin Asymmetries of Meson Electroproduction
• Calculations of three-nucleon reactions with N3LO chiral forces: achievements and challenges
• Proposal for measuring new transverse momentum dependent parton distributions $g_{1T}$ and $h_{1L}^{\perp }$ through semi-inclusive deep inelastic scattering
• Erratum to "Azimuthal asymmetry in electro-production of neutral pions in semi-inclusive DIS" published in Phys. Lett. B522 (2001) 37
• Azimuthal single spin asymmetries in SIDIS in the light of chiral symmetry breaking
• Partonic State and Single Transverse Spin Asymmetry in Drell-Yan Process
• Soft-Gluon-Pole Contribution in Single Transverse-Spin Asymmetries of Drell-Yan Processes
• Azimuthal asymmetries in lepton-pair production at a fixed-target experiment using the LHC beams (AFTER)
• Single Transverse Spin Asymmetries at Parton Level
• Transversity from two pion interference fragmentation
• Probing the transverse spin of quarks in deep inelastic scattering
• Partonic State and Single Transverse Spin Asymmetries in Semi Inclusive DIS
• Collins Effect in Single Spin Asymmetries of the $p^{\uparrow }p\to \pi X$ Process
• Azimuthal asymmetries in single polarized proton-proton Drell-Yan processes
• Single Target-Spin Asymmetry in Semi-Inclusive Deep Inelastic Scattering on Transversely Polarized Nucleon Target
• Probing pretzelosity $h_{1T}^{\perp }$ via the polarized proton-antiproton Drell-Yan process
• Neutrons and antiprotons in ultrahigh energy cosmic rays
• The $\sin 2\varphi$ azimuthal asymmetry in single longitudinally polarized $\pi N$ Drell-Yan process
• Collinear Factorization for Single Transverse-Spin Asymmetry in Drell-Yan Processes
• Spin Orbit Correlations and the Structure of the Nucleon
• The $\sin 2{\varphi }_h$ azimuthal asymmetry of pion production in SIDIS within TMD factorization
• Q^2 dependence of azimuthal asymmetries in semi-inclusive deep inelastic scattering and in Drell-Yan
• Boer-Mulders function of the pion and pretzelosity distribution of the proton in the polarized pion-proton Drell-Yan process at COMPASS
• T-odd proton-helicity asymmetry in semi-inclusive DIS in perturbative QCD
• Fragmentation functions of mesons in the Field-Feynman model
• Single/Double-Spin Asymmetry Measurements of Semi-Inclusive Pion Electroproduction on a Transversely Polarized 3He Target through Deep Inelastic Scattering
• Muon Charge Ratio of Ultrahigh Energy Cosmic Rays
• Sivers effect in semi-inclusive DIS and in the Drell-Yan process