Constraining the Energy Momentum Tensor through DVCS Dispersion Relation beyond Leading Power
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866911484137701376 |
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| author | Martínez-Fernández, Víctor Binosi, Daniele Mezrag, Cédric Yao, Zhao-Qian |
| author_facet | Martínez-Fernández, Víctor Binosi, Daniele Mezrag, Cédric Yao, Zhao-Qian |
| contents | In this letter, we analyse and interpret the kinematic power corrections to deeply virtual Compton scattering dispersion relation. We show that the kinematic corrections at twist-4 can be connected to other form factors of the Energy-Momentum Tensor beyond the pressure distribution involved at leading-power, namely the ones related to Momentum and total Angular Momentum distributions. In the nucleon case, these corrections are not negligible at presently accessible virtualities. The DVCS subtraction constant becomes an experimental constraint on momentum distributions, pressure forces distributions, and total angular momentum distributions. Finally, we use continuum and lattice-QCD results to predict the expected size of the DVCS subtraction constant, and conclude that momentum distributions are responsible of roughly one-third of the experimental signal at $Q^2 = 2\textrm{GeV}^2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_06669 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Constraining the Energy Momentum Tensor through DVCS Dispersion Relation beyond Leading Power Martínez-Fernández, Víctor Binosi, Daniele Mezrag, Cédric Yao, Zhao-Qian High Energy Physics - Phenomenology Nuclear Theory In this letter, we analyse and interpret the kinematic power corrections to deeply virtual Compton scattering dispersion relation. We show that the kinematic corrections at twist-4 can be connected to other form factors of the Energy-Momentum Tensor beyond the pressure distribution involved at leading-power, namely the ones related to Momentum and total Angular Momentum distributions. In the nucleon case, these corrections are not negligible at presently accessible virtualities. The DVCS subtraction constant becomes an experimental constraint on momentum distributions, pressure forces distributions, and total angular momentum distributions. Finally, we use continuum and lattice-QCD results to predict the expected size of the DVCS subtraction constant, and conclude that momentum distributions are responsible of roughly one-third of the experimental signal at $Q^2 = 2\textrm{GeV}^2$. |
| title | Constraining the Energy Momentum Tensor through DVCS Dispersion Relation beyond Leading Power |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2509.06669 |