Evidence for the Absence of Gluon Orbital Angular Momentum in the Nucleon

Abstract

The Sivers mechanism for the single-spin asymmetry in unpolarized lepton scattering from a transversely polarized nucleon is driven by the orbital angular momentum carried by its quark and gluon constituents, combined with QCD final-state interactions. Both quark and gluon mechanisms can generate such a single-spin asymmetry, though only the quark mechanism can explain the small single-spin asymmetry measured by the COMPASS collaboration on the deuteron, suggesting the gluon mechanism is small relative to the quark mechanism. We detail empirical studies through which the gluon and quark orbital angular momentum contributions, quark-flavor by quark-flavor, can be elucidated.

arXiv comment13 pages, clarifications and refs. added, version to appear in PLB

References in corpus (39)

• Gauge-Invariant Decomposition of Nucleon Spin and Its Spin-Off
• Quantum Chromodynamics and Other Field Theories on the Light Cone
• Fragmentation of Transversely Polarized Quarks Probed in Transverse Momentum Distributions
• Leading-twist Single-transverse-spin asymmetries: Drell-Yan and Deep-Inelastic Scattering
• Time-reversal odd distribution functions in leptoproduction
• Final-State Interactions and Single-Spin Asymmetries in Semi-Inclusive Deep Inelastic Scattering
• Single-spin asymmetries in semi-inclusive deep-inelastic scattering on a transversely polarized hydrogen target
• Final state interactions and gauge invariant parton distributions
• Single-spin asymmetries: the Trento conventions
• Parton Distributions in Light-Cone Gauge: Where Are the Final-State Interactions?
• First Measurement of the Transverse Spin Asymmetries of the Deuteron in Semi-Inclusive Deep Inelastic Scattering
• Light-Cone Representation of the Spin and Orbital Angular Momentum of Relativistic Composite Systems
• Measurement of the Light Antiquark Flavor Asymmetry in the Nucleon Sea
• Strange Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-Proton Scattering Experiment
• CTEQ Parton Distributions and Flavor Dependence of Sea Quarks
• Light-Cone Wavefunction Representation of Deeply Virtual Compton Scattering
• Single spin asymmetry for $p^{\uparrow }p\to \pi X$ in perturbative QCD
• The Strange Quark Contribution to the Proton's Magnetic Moment
• Single-Transverse Spin Asymmetries: From DIS to Hadronic Collisions
• The Spin Structure of the Nucleon
• Extracting the Sivers function from polarized SIDIS data and making predictions
• Transverse Deformation of Parton Distributions and Transversity Decomposition of Angular Momentum
• Impact Parameter Dependent Parton Distributions and Transverse Single Spin Asymmetries
• Constraints on the Nucleon Strange Form Factors at Q^2 ~ 0.1 GeV^2
• Flavor Asymmetry of Light Quarks in the Nucleon Sea
• Single spin asymmetries in transversely polarized proton(antiproton) - proton inclusive processes
• What exactly is a parton density?
• Parity-violating Electron Deuteron Scattering and the Proton's Neutral Weak Axial Vector Form Factor
• Chromodynamic Lensing and Transverse Single Spin Asymmetries
• Nuclear effects in Deep Inelastic Scattering of polarized electrons off polarized 3He and the neutron spin structure functions
• Sivers Asymmetry and Generalized Parton Distributions in Impact Parameter Space
• Quark Correlations and Single Spin Asymmetries
• Accessing Sivers gluon distribution via transverse single spin asymmetries in p(transv. polarized) p --> D X processes at RHIC
• The covariant structure of light-front wave functions and the behavior of hadronic form factors
• Sivers Mechanism for Gluons
• Evolution of average multiplicities of quark and gluon jets
• Constraints on the gluon Sivers distribution via transverse single spin asymmetries at midrapidity in p(transv. polarized) p -> pi^0 X processes at BNL RHIC
• Discrete Symmetries on the Light Front and a General Relation Connecting Nucleon Electric Dipole and Anomalous Magnetic Moments
• Anomalous Magnetic Moments and Quark Orbital Angular Momentum

Cited by in corpus (39)

• Relations between generalized and transverse momentum dependent parton distributions
• Sivers Effect for Pion and Kaon Production in Semi-Inclusive Deep Inelastic Scattering
• A new measurement of the Collins and Sivers asymmetries on a transversely polarised deuteron target
• Azimuthal and Single Spin Asymmetries in Hard Scattering Processes
• The Spin Structure of the Nucleon
• A Lattice Study of Quark and Glue Momenta and Angular Momenta in the Nucleon
• Unquenched quark model for baryons: magnetic moments, spins and orbital angular momenta
• Heavy Quarkonium Production in Single Transverse Polarized High Energy Scattering
• Towards a first estimate of the gluon Sivers function from $A_N$ data in $pp$ collisions at RHIC
• Transverse Spin Structure of the Nucleon through Target Single Spin Asymmetry in Semi-Inclusive Deep-Inelastic $(e,e^{\prime }{\pi }^{\pm })$ Reaction at Jefferson Lab
• Hunting the Gluon Orbital Angular Momentum at the Electron-Ion Collider
• A quark model analysis of the Sivers function
• Connection between the Sivers function and the anomalous magnetic moment
• Model calculations of the Sivers function satisfying the Burkardt Sum Rule
• Transverse spin effects in hard semi-inclusive collisions
• Measurement of Transverse Single-Spin Asymmetries for J/psi Production in Polarized p+p Collisions at sqrt(s) = 200 GeV
• Neutron single spin asymmetries from semi-inclusive deep inelastic scattering off transversely polarized ${}^3$He
• Testing the process dependence of the Sivers function via hadron distributions inside a jet
• Exclusive production of quarkonia as a probe of the GPD E for gluons
• First measurement of the Sivers asymmetry for gluons from SIDIS data
• Magnetic Moments of Octet Baryons in Hot and Dense Nuclear Matter
• Phenomenological analysis of the nucleon spin contents and their scale dependence
• NLO Productions of $\omega$ and $K_{\mathrm{S}}^0$ with a Global Extraction of the Jet Transport Parameter in Heavy Ion collisions
• Distorted spin-dependent spectral function of an A=3 nucleus and semi-inclusive deep inelastic scattering processes
• Collins and Sivers effects in p(transv. polarized) p --> jet pion X: Universality and process dependence
• Spin of ground state baryons
• Perturbative Renormalization and Mixing of Quark and Glue Energy-Momentum Tensors on the Lattice
• Sivers and Boer-Mulders TMDs of proton in a light-front quark-diquark model
• Final state interactions and the extraction of neutron single spin asymmetries from SIDIS by a transversely polarized ${}^3$He target
• Quark and Glue Components of the Proton Spin from Lattice Calculation
• Orbital angular momentum of the proton and intrinsic five-quark Fock states
• Left-right asymmetry for pion and kaon production in the semi-inclusive deep inelastic scattering process
• Probing gluon TMDs with reconstructed and tagged heavy flavor hadron pairs at EIC
• The quark orbital angular momentum of ground state octet baryons
• Novel QCD Effects from Initial and Final State Interactions
• Transversity studies with protons and light nuclei
• The neutron transversity from semi-inclusive DIS off 3He
• Flavor asymmetry of the nucleon sea in an unquenched quark model
• Recent developments in the constituent quark model including quark-antiquark pairs