On extraction of twist-two Compton form factors from DVCS observables through harmonic analysis
Abstract We investigate the exercise of locally extracting the real and imaginary parts of the four twist-2 Compton form factors (CFFs) H E H ~ E ~ $$ \left\{\mathcal{H},\mathcal{E},\overset{\sim }{\mathcal{H}},\overset{\sim }{\mathcal{E}}\right\} $$ which arise in the deeply virtual Compton scatter...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-08-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP08(2022)048 |
| _version_ | 1811342813588094976 |
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| author | Kyle Shiells Yuxun Guo Xiangdong Ji |
| author_facet | Kyle Shiells Yuxun Guo Xiangdong Ji |
| author_sort | Kyle Shiells |
| collection | DOAJ |
| description | Abstract We investigate the exercise of locally extracting the real and imaginary parts of the four twist-2 Compton form factors (CFFs) H E H ~ E ~ $$ \left\{\mathcal{H},\mathcal{E},\overset{\sim }{\mathcal{H}},\overset{\sim }{\mathcal{E}}\right\} $$ which arise in the deeply virtual Compton scattering (DVCS) process e + p → e + p + γ. 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. |
| first_indexed | 2024-04-13T19:17:35Z |
| format | Article |
| id | doaj.art-108ba09a620d4a9a915d0ea6c8a31d1c |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-04-13T19:17:35Z |
| publishDate | 2022-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-108ba09a620d4a9a915d0ea6c8a31d1c2022-12-22T02:33:37ZengSpringerOpenJournal of High Energy Physics1029-84792022-08-012022815410.1007/JHEP08(2022)048On extraction of twist-two Compton form factors from DVCS observables through harmonic analysisKyle Shiells0Yuxun Guo1Xiangdong Ji2Center for Nuclear FemtographyUniversity of MarylandCenter for Nuclear FemtographyAbstract We investigate the exercise of locally extracting the real and imaginary parts of the four twist-2 Compton form factors (CFFs) H E H ~ E ~ $$ \left\{\mathcal{H},\mathcal{E},\overset{\sim }{\mathcal{H}},\overset{\sim }{\mathcal{E}}\right\} $$ which arise in the deeply virtual Compton scattering (DVCS) process e + p → e + p + γ. 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.https://doi.org/10.1007/JHEP08(2022)048Parton DistributionsProperties of HadronsSpecific QCD Phenomenology |
| spellingShingle | Kyle Shiells Yuxun Guo Xiangdong Ji On extraction of twist-two Compton form factors from DVCS observables through harmonic analysis Journal of High Energy Physics Parton Distributions Properties of Hadrons Specific QCD Phenomenology |
| title | On extraction of twist-two Compton form factors from DVCS observables through harmonic analysis |
| title_full | On extraction of twist-two Compton form factors from DVCS observables through harmonic analysis |
| title_fullStr | On extraction of twist-two Compton form factors from DVCS observables through harmonic analysis |
| title_full_unstemmed | On extraction of twist-two Compton form factors from DVCS observables through harmonic analysis |
| title_short | On extraction of twist-two Compton form factors from DVCS observables through harmonic analysis |
| title_sort | on extraction of twist two compton form factors from dvcs observables through harmonic analysis |
| topic | Parton Distributions Properties of Hadrons Specific QCD Phenomenology |
| url | https://doi.org/10.1007/JHEP08(2022)048 |
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