The Beam--Charge Azimuthal Asymmetry and Deeply Virtual Compton Scattering

Abstract

The first observation of an azimuthal cross--section asymmetry with respect to the charge of the incoming lepton beam is reported from a study of hard exclusive electroproduction of real photons. The data have been accumulated by the HERMES experiment at DESY, in which the HERA 27.6 GeV electron or positron beam scattered off an unpolarized hydrogen gas target. The observed asymmetry is attributed to the interference between the Bethe--Heitler process and the Deeply Virtual Compton Scattering (DVCS) process. The interference term is sensitive to DVCS amplitudes, which provide the most direct access to Generalized Parton Distributions.

References in corpus (29)

• Gauge-Invariant Decomposition of Nucleon Spin and Its Spin-Off
• Wave Functions, Evolution Equations and Evolution Kernels from Light-Ray Operators of QCD
• Deeply Virtual Compton Scattering
• Nonforward Parton Distributions
• Hard Exclusive Reactions and the Structure of Hadrons
• Impact Parameter Dependent Parton Distributions and Off-Forward Parton Distributions for $\zeta \to 0$
• Impact Parameter Space Interpretation for Generalized Parton Distributions
• Theory of deeply virtual Compton scattering on the nucleon
• Single-spin asymmetries: the Trento conventions
• Skewed and double distributions in pion and nucleon
• Generalized parton distributions in impact parameter space
• LEPTO 6.5 - A Monte Carlo Generator for Deep Inelastic Lepton-Nucleon Scattering
• Deeply virtual electroproduction of photons and mesons on the nucleon : leading order amplitudes and power corrections
• Measurement of the Beam-Spin Azimuthal Asymmetry Associated with Deeply-Virtual Compton Scattering
• The HERMES Spectrometer
• Observation of exclusive DVCS in polarized electron beam asymmetry measurements
• Double distributions and evolution equations
• Femto-Photography of Protons to Nuclei with Deeply Virtual Compton Scattering
• Symmetries and structure of skewed and double distributions
• Evolution and models for skewed parton distributions
• Testing the handbag contribution to exclusive virtual Compton scattering
• QED radiative corrections to virtual Compton scattering
• DVCS on the nucleon : study of the twist-3 effects
• Modelling generalized parton distributions to describe deeply virtual Compton scattering data
• Nucleon hologram with exclusive leptoproduction
• The dual parameterization of the proton generalized parton distribution functions H and E and description of the DVCS cross sections and asymmetries
• Future Measurements of Deeply Virtual Compton Scattering at HERMES
• Beam-Charge Asymmetry associated with DVCS at HERMES
• Single--Spin Asymmetries in the Bethe--Heitler Process $e^{-}+p\to e^{-}+\gamma +p$ from QED Radiative Corrections

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• Deeply virtual Compton scattering at small x_B and the access to the GPD H
• Deeply Virtual Compton Scattering Beam-Spin Asymmetries
• Spin Structure of the Nucleon - Status and Recent Results
• Nucleon form-factors of the energy momentum tensor in the chiral quark-soliton model
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• Towards a fitting procedure for deeply virtual Compton scattering at next-to-leading order and beyond
• Cross sections for the exclusive photon electroproduction on the proton and Generalized Parton Distributions
• The nucleon form-factors of the energy momentum tensor in the Skyrme model
• The E00-110 experiment in Jefferson Lab's Hall A: Deeply Virtual Compton Scattering off the Proton at 6 GeV
• Beam-helicity and beam-charge asymmetries associated with deeply virtual Compton scattering on the unpolarised proton
• Pretzelosity $h_{1T}^{\perp }$ and quark orbital angular momentum
• Measurement of Azimuthal Asymmetries With Respect To Both Beam Charge and Transverse Target Polarization in Exclusive Electroproduction of Real Photons
• The Hadronic Final State at HERA
• Nucleon structure from basis light-front quantization
• Energy-momentum tensor form factors of the nucleon in nuclear matter
• Measurement of double-spin asymmetries associated with deeply virtual Compton scattering on a transversely polarized hydrogen target
• Exclusive Leptoproduction of Real Photons on a Longitudinally Polarised Hydrogen Target
• Deeply Virtual Compton Scattering to the twist-four accuracy: Impact of finite-$t$ and target mass corrections
• A fitter code for Deep Virtual Compton Scattering and Generalized Parton Distributions
• Beam-helicity asymmetry arising from deeply virtual Compton scattering measured with kinematically complete event reconstruction
• Unbiased determination of DVCS Compton Form Factors
• The pion mass dependence of the nucleon form-factors of the energy momentum tensor in the chiral quark-soliton model
• Sum rules and dualities for generalized parton distributions: is there a holographic principle?
• Border and skewness functions from a leading order fit to DVCS data
• D-term and structure of point-like and composed spin-0 particles
• Separation of contributions from deeply virtual Compton scattering and its interference with the Bethe--Heitler process in measurements on a hydrogen target
• Radial excitations of Q-balls, and their D-term
• Deeply Virtual Compton Scattering at a Proposed High-Luminosity Electron-Ion Collider
• Energy momentum tensor, stability, and the D-term of Q-balls
• Measurement of azimuthal asymmetries associated with deeply virtual Compton scattering on an unpolarized deuterium target
• First Exclusive Measurement of Deeply Virtual Compton Scattering off ${}^4$He: Toward the 3D Tomography of Nuclei
• Nuclear-mass dependence of azimuthal beam-helicity and beam-charge asymmetries in deeply virtual Compton scattering
• Deeply virtual Compton scattering on a virtual pion target
• Addition-Deletion Networks
• Where do we stand with a 3-D picture of the proton?
• Helicity-dependent generalized parton distributions for nonzero skewness
• The dynamic origins of fermionic D-terms
• Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering
• Measurement of azimuthal asymmetries associated with deeply virtual Compton scattering on a longitudinally polarized deuterium target
• Spatial imaging of proton via leading-twist non-skewed GPDs with basis light-front quantization
• 2D energy-momentum tensor distributions of nucleon in a large-$N_c$ quark model from ultra-relativistic to non-relativistic limit
• Resumming soft and collinear contributions in deeply virtual Compton scattering
• Unitary constraints on Deeply Virtual Compton Scattering
• Prospects for quarkonium studies at the high-luminosity LHC
• Exclusive Meson Photo- and Electro-production, a Window on the Structure of Hadronic Matter
• Nuclear DVCS at small-x using the color dipole phenomenology
• Generalized parton distributions in the soft-wall model of AdS/QCD
• Generalised parton distributions at HERA and prospects for COMPASS
• Generalized Parton Distributions and Deeply Virtual Compton Scattering
• Generalized form factors of the nucleon in a light-cone spectator-diquark model
• Deeply Virtual Compton Scattering on nucleons and nuclei in generalized vector meson dominance model
• Double Helicity Dependence of Jet Properties from Dihadrons in Longitudinally Polarized p+p Collisions at sqrt(s) = 200 GeV
• Deeply Virtual Exclusive Processes and Generalized Parton Distributions
• Beam-helicity asymmetry in associated electroproduction of real photons $ep\to e\gamma \pi N$ in the $\Delta$-resonance region
• Nucleon Structure from Basis Light-Front Quantization : Status and Prospects
• Beam Spin Asymmetries in DVCS with CLAS at 4 .8 GeV
• Neutron DVCS Measurements with BONuS12 in CLAS12
• Quark-nucleon dynamics and Deep Virtual Compton Scattering
• Timelike Compton Scattering at JLab
• Deeply virtual Compton scattering off the neutron
• Parton promenade into the nucleon
• New framework for extracting GPDs from exclusive photon electroproduction
• Deeply virtual Compton scattering using a positron beam in Hall-C at Jefferson Lab