Description and interpretation of DVCS measurements

Abstract

Having in mind the well-known limitations of certain models of generalized parton distributions (GPDs), we show that the allegedly universal GPDs, describing both deeply virtual Compton scattering (DVCS) and deeply virtual meson production (DVMP) data, fail to describe measurements of deep inelastic scattering. We present a new global DVCS fit that describes reasonably the world data set, which includes now also new measurements from Hall A and CLAS collaborations. We also explicitly illustrate that Compton form factors (CFFs) cannot be unambiguously extracted from photon electroproduction measurements off unpolarized proton alone and we argue that it is more reliable to interpret such measurements in terms of certain CFF combinations, where still some care is needed in order to estimate the propagated error.

15 pages, 5 figures, contribution to the 6th International conference on Physics Opportunities at Electron-Ion colliders (POETIC6)

References in corpus (25)

• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• Theory of deeply virtual Compton scattering on the nucleon
• Deeply virtual electroproduction of photons and mesons on the nucleon : leading order amplitudes and power corrections
• The role of the quark and gluon GPDs in hard vector-meson electroproduction
• Measurement of deeply virtual Compton scattering at HERA
• Deeply virtual Compton scattering at small x_B and the access to the GPD H
• A Measurement and QCD Analysis of the Proton Structure Function $F_2(x,Q^2)$ at HERA
• Deeply Virtual Compton Scattering Beam-Spin Asymmetries
• Scaling Tests of the Cross Section for Deeply Virtual Compton Scattering
• A measurement of the Q^2, W and t dependences of deeply virtual Compton scattering at HERA
• Measurement of Deeply Virtual Compton Scattering with a Polarized Proton Target
• Deeply Virtual Compton Scattering and its Beam Charge Asymmetry in e^\pm p Collisions at HERA
• From hard exclusive meson electroproduction to deeply virtual Compton scattering
• Beam-helicity and beam-charge asymmetries associated with deeply virtual Compton scattering on the unpolarised proton
• Dispersive evaluation of the D-term form factor in deeply virtual Compton scattering
• Modelling generalized parton distributions to describe deeply virtual Compton scattering data
• Exclusive Leptoproduction of Real Photons on a Longitudinally Polarised Hydrogen Target
• Beam-helicity asymmetry arising from deeply virtual Compton scattering measured with kinematically complete event reconstruction
• A fitter code for Deep Virtual Compton Scattering and Generalized Parton Distributions
• Single and double spin asymmetries for deeply virtual Compton scattering measured with CLAS and a longitudinally polarized proton target
• Generalized Parton Distributions from Deep Virtual Compton Scattering at CLAS
• Generalized Parton Distributions from Deeply Virtual Compton Scattering at HERMES
• 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
• Generalized Parton Distributions and Deeply Virtual Compton Scattering

Cited by in corpus (19)

• GPD phenomenology and DVCS fitting - Entering the high-precision era
• Parton distributions and lattice QCD calculations: toward 3D structure
• Gravitational form factors and mechanical properties of proton in a light-front quark-diquark model
• A Glimpse of Gluons through Deeply Virtual Compton Scattering on the Proton
• Border and skewness functions from a leading order fit to DVCS data
• Transverse Extension of Partons in the Proton probed by Deeply Virtual Compton Scattering
• Generalized parton distributions through universal moment parameterization: non-zero skewness case
• Chiral theory of nucleons and pions in the presence of an external gravitational field
• Deeply virtual Compton scattering cross section at high Bjorken $x_B$
• Gravitational form factors of $\rho$ meson with a light-cone constituent quark model
• Quadrupole pressure and shear forces inside baryons in the large $N_c$ limit
• Exclusive neutrino-production of a charmed meson
• A bound on the nucleon Druck-term from chiral EFT in curved space-time and mechanical stability conditions
• NLO corrections to the deeply virtual meson production revisited: impact on the extraction of generalized parton distributions
• Exploring Baryon Resonances with Transition Generalized Parton Distributions: Status and Perspectives
• Matching generalised transverse-momentum-dependent distributions onto generalised parton distributions at one loop
• Medium modification of the nucleon mechanical properties: Abel tomography case
• Study of deeply virtual Compton scattering at the future Electron-Ion Collider
• Systematic description of hadron's response to non-local QCD probes: Froissart-Gribov projections in analysis of deeply virtual Compton scattering