Single-Spin Observables and Orbital Structures in Hadronic Distributions

Abstract

Within the light-quark sector of the standard model, P-odd observables are generated from point-like electroweak processes while A_t- odd observables (neglecting quark mass parameters) come from dynamic spin-orbit correlations within hadrons or within larger composite systems, such as nuclei. The effects of A_t-odd dynamics can be inserted into transverse-momentum dependent constituent distribution functions and, in this paper, we construct the contribution from an orbital quark to the A_t odd quark parton distribution. Using this distribution, we examine the crucial role of initial- and final-state interactions in the observation of the scattering asymmetries in different hard-scattering processes. This construction provides a geometrical and dynamical interpretation of the Collins conjugation relation between single-spin asymmetries in semi-inclusive deep inelastic scattering and the asymmetries in Drell-Yan production. Finally, our construction allows us to display a significant difference between the calculation of a spin asymmetry generated by a hard scattering mechanism involving color-singlet exchange (such as a photon) and a calculation of an asymmetry with a hard-scattering exchange involving gluons. This leads to an appreciation of the process dependence inherent in measurements of single-spin observables.

35 pages, 6 figures

References in corpus (23)

• Generalized Parton Distributions
• Fragmentation of Transversely Polarized Quarks Probed in Transverse Momentum Distributions
• Unraveling hadron structure with generalized parton 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
• The complete tree-level result up to order $1/Q$ for polarized deep-inelastic leptoproduction
• Single-spin asymmetries: the Trento conventions
• Universality of soft and collinear factors in hard-scattering factorization
• Evolution of the nuclear modification factors with rapidity and centrality in d+Au collisions at $\sqrt{s_{NN}} = 200 GeV
• Intrinsic transverse momentum and the polarized Drell-Yan process
• Single Transverse-Spin Asymmetry in Drell-Yan Production at Large and Moderate Transverse Momentum
• A Bound on the Energy Loss of Partons in Nuclei
• Asymmetric jet correlations in p p^\uparrow scattering
• Novel Transversity Properties in Semi-Inclusive Deep Inelastic Scattering
• 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
• Parton intrinsic motion: suppression of the Collins mechanism for transverse single spin asymmetries in p(transv. polarised) p --> pion + X
• Transverse single spin asymmetries in Drell-Yan processes
• Accessing transversity via J/Psi production in polarized p-pbar interactions
• Pseudorapidity dependence of charged hadron transverse momentum spectra in d+Au collisions at sqrt sNN = 200 GeV
• Measurement of the Absolute np Scattering Differential Cross Section at 194 MeV
• Color Gauge Invariance in Hard Processes

Cited by in corpus (16)

• Sivers effect in Drell-Yan processes
• Electroproduction of Eta Mesons in the S11(1535) Resonance Region at High Momentum Transfer
• Transverse spin effects in hard semi-inclusive collisions
• First measurement of the Sivers asymmetry for gluons from SIDIS data
• Transverse single spin asymmetries in inclusive deep-inelastic scattering
• The Fractured Boer-Mulders Effect in the Production of Polarized Baryons
• Chiral Dynamics of the Polarizing Fracture Functions for Baryon Production
• Kane-Pumplin-Repko Factorization: its application to precision measurements of transverse spin asymmetries and to the study of TMD evolution
• Baryon Polarization, Phases of Amplitudes and Time Reversal Odd Observables
• Probing gluon TMDs with reconstructed and tagged heavy flavor hadron pairs at EIC
• Interference Effects, Time Reversal Violation and Search for New Physics in Hadronic Weak Decays
• Ideas in transverse spin physics
• Quantum Number Density Asymmetries Within QCD Jets Correlated With Lambda Polarization
• Spin-Directed Momentum Transfers in SIDIS Baryon Production
• Chiral Dynamics and Single-Spin Asymmetries
• T-odd Observables in Elastic Scattering, in Deep Inelastic Processes and in Weak Decays