Spiral structure and logarithmic evolution of deuteron form factors: evidence for a transitional regime in QCD
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| Format: | Preprint |
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2026
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| _version_ | 1866911664162471936 |
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| author | Krivenko-Emetov, Yaroslav D. Myroshnykova, Iryna |
| author_facet | Krivenko-Emetov, Yaroslav D. Myroshnykova, Iryna |
| contents | We present a consistent analysis of elastic electron--deuteron scattering combining perturbative quantum chromodynamics (pQCD) scaling, helicity amplitudes, and phenomenological parameterizations of deuteron form factors. Particular attention is paid to logarithmic corrections governed by anomalous dimensions of six-quark operators and to two-photon exchange (TPE).
Three classes of parameterizations corresponding to different dynamical regimes are considered: pre-asymptotic valence-quark dominance, effective higher-twist contributions, and modified logarithmic evolution.
A global fit to the world data for the structure functions $A(Q^2)$ and $B(Q^2)$, differential cross sections, and tensor polarization observables is performed using a combined strategy of global and local minimization.
The best description of the complete data set is achieved within the $f_1$ parameterization, which incorporates pre-asymptotic logarithmic behavior and correlated valence-quark dynamics. Among the considered models, $f_1$ gives the smallest value of $χ^2/\mathrm{dof}$.
The obtained results indicate that the presently accessible momentum-transfer region corresponds to a transitional regime between hadronic and quark--gluon descriptions. Helicity-conserving amplitudes dominate, whereas the asymptotic pQCD regime has not yet been fully realized. This may indicate nontrivial multiquark correlations related to hidden-color configurations in the short-distance deuteron structure.
The tensor polarization observable $t_{21}$ is especially sensitive to the asymptotic behavior of the helicity amplitudes. Future measurements at larger $Q^2$ may provide a decisive test for distinguishing between the considered dynamical scenarios. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_08225 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Spiral structure and logarithmic evolution of deuteron form factors: evidence for a transitional regime in QCD Krivenko-Emetov, Yaroslav D. Myroshnykova, Iryna High Energy Physics - Phenomenology Nuclear Theory We present a consistent analysis of elastic electron--deuteron scattering combining perturbative quantum chromodynamics (pQCD) scaling, helicity amplitudes, and phenomenological parameterizations of deuteron form factors. Particular attention is paid to logarithmic corrections governed by anomalous dimensions of six-quark operators and to two-photon exchange (TPE). Three classes of parameterizations corresponding to different dynamical regimes are considered: pre-asymptotic valence-quark dominance, effective higher-twist contributions, and modified logarithmic evolution. A global fit to the world data for the structure functions $A(Q^2)$ and $B(Q^2)$, differential cross sections, and tensor polarization observables is performed using a combined strategy of global and local minimization. The best description of the complete data set is achieved within the $f_1$ parameterization, which incorporates pre-asymptotic logarithmic behavior and correlated valence-quark dynamics. Among the considered models, $f_1$ gives the smallest value of $χ^2/\mathrm{dof}$. The obtained results indicate that the presently accessible momentum-transfer region corresponds to a transitional regime between hadronic and quark--gluon descriptions. Helicity-conserving amplitudes dominate, whereas the asymptotic pQCD regime has not yet been fully realized. This may indicate nontrivial multiquark correlations related to hidden-color configurations in the short-distance deuteron structure. The tensor polarization observable $t_{21}$ is especially sensitive to the asymptotic behavior of the helicity amplitudes. Future measurements at larger $Q^2$ may provide a decisive test for distinguishing between the considered dynamical scenarios. |
| title | Spiral structure and logarithmic evolution of deuteron form factors: evidence for a transitional regime in QCD |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2605.08225 |