On extraction of twist-two Compton form factors from DVCS observables through harmonic analysis

Shiells, Kyle; Guo, Yuxun; Ji, Xiangdong

doi:10.1007/jhep08(2022)048

On extraction of twist-two Compton form factors from DVCS observables through harmonic analysis

Journal Article · Wed Aug 03 00:00:00 EDT 2022 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep08(2022)048· OSTI ID:1976505

Shiells, Kyle ^[1]; Guo, Yuxun ^[2]; Ji, Xiangdong ^[3]

Center for Nuclear Femtography, Washington DC (United States); Univ. of Maryland, College Park, MD (United States)
University of Maryland, College Park, MD (United States)
Center for Nuclear Femtography, Washington DC (United States); University of Maryland, College Park, MD (United States)

We investigate the exercise of locally extracting the real and imaginary parts of the four twist-2 Compton form factors (CFFs) {$$\mathcal{H,E,\tilde H,\tilde E}$$} which arise in the deeply virtual Compton scattering (DVCS) process e + p → e + p + y. Neglecting dynamical higher-twist contributions, we find that there are a sufficient number of DVCS observables and degrees of freedom to extract all 8 leading quantities model-independently, exploiting the azimuthal dependence of the absolute cross sections across all possible beam and target polarizations at a common kinematical point in {Q, t,x_b, y}. As an example, for typical JLab lab-frame kinematics, we simplify the reduced DVCS observables to their dominant terms, providing a sufficient number of equations for local determination of the twist-2 CFFs. We demonstrate the feasibility using harmonic fitting to both cross sections and beam spin asymmetries with both real and pseudo-data.

View Accepted Manuscript (DOE)

Research Organization:: University of Maryland, College Park, MD (United States)

Sponsoring Organization:: Southeastern Universities Research Association; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0020682

OSTI ID:: 1976505

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 8 Vol. 2022; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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