Single and double spin asymmetries for deeply virtual Compton scattering measured with CLAS and a longitudinally polarized proton target

Abstract

Single-beam, single-target, and double-spin asymmetries for hard exclusive photon production on the proton $\vec{e}\vec{p}\to e^{\prime }{p}^{\prime }\gamma$ are presented. The data were taken at Jefferson Lab using the CLAS detector and a longitudinally polarized ${}^{14}$NH${}_3$ target. The three asymmetries were measured in 165 4-dimensional kinematic bins, covering the widest kinematic range ever explored simultaneously for beam and target-polarization observables in the valence quark region. The kinematic dependences of the obtained asymmetries are discussed and compared to the predictions of models of Generalized Parton Distributions. The measurement of three DVCS spin observables at the same kinematic points allows a quasi-model-independent extraction of the imaginary parts of the $H$ and $\tilde{H}$ Compton Form Factors, which give insight into the electric and axial charge distributions of valence quarks in the proton.

28 pages, 25 figures

References in corpus (27)

• Generalized Parton Distributions
• Unraveling hadron structure with generalized parton distributions
• Hard Exclusive Reactions and the Structure of Hadrons
• Theory of deeply virtual Compton scattering on the nucleon
• Nucleon Form Factors from Generalized Parton Distributions
• Observation of exclusive DVCS in polarized electron beam asymmetry measurements
• Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio to Q^2 = 8.5 GeV^2
• Generalized Parton Distributions in the valence region from Deeply Virtual Compton Scattering
• Deeply Virtual Compton Scattering Beam-Spin Asymmetries
• On the analysis of lepton scattering on longitudinally or transversely polarized protons
• Scaling Tests of the Cross Section for Deeply Virtual Compton Scattering
• Flavor decomposition of the elastic nucleon electromagnetic form factors
• Measurement of Deeply Virtual Compton Scattering with a Polarized Proton Target
• From hard exclusive meson electroproduction to deeply virtual Compton scattering
• Flexible Parametrization of Generalized Parton Distributions from Deeply Virtual Compton Scattering Observables
• Measurement of Azimuthal Asymmetries With Respect To Both Beam Charge and Transverse Target Polarization in Exclusive Electroproduction of Real Photons
• Exclusive Leptoproduction of Real Photons on a Longitudinally Polarised Hydrogen Target
• A fitter code for Deep Virtual Compton Scattering and Generalized Parton Distributions
• Interpretation of the Flavor Dependence of Nucleon Form Factors in a Generalized Parton Distribution Model
• Measurement of Exclusive ${\pi }^0$ Electroproduction Structure Functions and their Relationship to Transversity GPDs
• Generalized Parton Distributions from Deep Virtual Compton Scattering at CLAS
• Generalized Parton Distributions from Deeply Virtual Compton Scattering at HERMES
• Longitudinal target-spin asymmetries for deeply virtual Compton scattering
• Constraints on the $\tilde{H}$ Generalized Parton Distribution from Deep Virtual Compton Scattering Measured at HERMES
• HERMES impact for the access of Compton form factors
• On the Observability of the Quark Orbital Angular Momentum Distribution
• Single--Spin Asymmetries in the Bethe--Heitler Process $e^{-}+p\to e^{-}+\gamma +p$ from QED Radiative Corrections

Cited by in corpus (30)

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• The E00-110 experiment in Jefferson Lab's Hall A: Deeply Virtual Compton Scattering off the Proton at 6 GeV
• The Present and Future of QCD
• Unbiased determination of DVCS Compton Form Factors
• Description and interpretation of DVCS measurements
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• Border and skewness functions from a leading order fit to DVCS data
• Tomographic image of the proton
• First Exclusive Measurement of Deeply Virtual Compton Scattering off ${}^4$He: Toward the 3D Tomography of Nuclei
• Analysis of Deeply Virtual Compton Scattering Data at Jefferson Lab and Proton Tomography
• Deeply virtual Compton scattering cross section at high Bjorken $x_B$
• Where do we stand with a 3-D picture of the proton?
• First-time measurement of Timelike Compton Scattering
• Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering
• Twist-three cross-sections in deeply virtual Compton scattering
• Twist-3 Generalized Parton Distribution for the Proton from Basis Light-Front Quantization
• Measurement of Unpolarized and Polarized Cross Sections for Deeply Virtual Compton Scattering on the Proton at Jefferson Laboratory with CLAS
• Target and beam-target spin asymmetries in exclusive pion electroproduction for $Q^2>1$ GeV${}^2$. II. $ep\to e{\pi }^{0}p$
• Target and Beam-Target Spin Asymmetries in Exclusive Pion Electroproduction for $Q^2>1$ GeV${}^2$. I. $ep\to e{\pi }^{+}n$
• From QCD Symmetries to Nuclei and Neutron Stars
• Dense Baryonic Matter and Strangeness in Neutron Stars
• Deciphering Twist-3 Chiral-Even GPDs in the Light-Front Quark-Diquark Model
• Deeply virtual Compton scattering in the tensor-pomeron approach
• Probing nucleon spin structure in deep-inelastic scattering, proton-proton collisions and Drell-Yan processes
• Unified and optimal frame choice for generalized parton distributions
• New framework for extracting GPDs from exclusive photon electroproduction
• Assessing the impact of the electron ion collider in China on Deeply Virtual Compton Scattering
• Positrons at JLab - Advancing Nuclear Science in Hall B