Abstract
Diffractive deeply virtual Compton scattering (DiDVCS) is the process $\gamma^*(- Q^2) + N \rightarrow \rho^0 + \gamma^* (Q'^2)+ N'$, where N is a nucleon or light nucleus, in the kinematical regime of large rapidity gap between the $\rho^0$ and the final photon-nucleus system, and in the generalized Bjorken regime where both photon virtualities $Q^2$ and $ Q'^2$ are large. We show that this process has the unique virtue of combining the large diffractive cross sections at high energy with the tomographic ability of deeply virtual Compton scattering to scrutinize the quark and gluon content of nucleons and light nuclei. Its study at an electron-ion collider would enlighten the internal structure of hadrons.
Highlights
Diffractive deeply virtual Compton scattering (DiDVCS) is the process γÃð−Q2ÞþN →ρ0 þγÃðQ02ÞþN0, where N is a nucleon or light nucleus, in the kinematical regime of large rapidity gap between the ρ0 and the final photon-nucleus system, and in the generalized Bjorken regime where both photon virtualities Q2 and Q02 are large. We show that this process has the unique virtue of combining the large diffractive cross sections at high energy with the tomographic ability of deeply virtual Compton scattering to scrutinize the quark and gluon content of nucleons and light nuclei
It is common wisdom that the dominant mechanism of a diffractive electroproduction process in the hard regime is the scattering of a small transverse-size (OðQ1Þ) colorless dipole on a nuclear target, where Q is the virtuality of the exchanged hard photon
The unique features of nearly forward exclusive hard scattering amplitudes in the generalized Bjorken regime allowed to construct a vast program aiming at the tomography of nucleons and light nuclei
Summary
It is common wisdom that the dominant mechanism of a diffractive electroproduction process in the hard regime is the scattering of a small transverse-size (OðQ1Þ) colorless dipole on a nuclear target, where Q is the virtuality of the exchanged hard photon. This justifies the use of perturbative QCD methods for the description of the process. The process we study here—called DiDVCS for diffractive deeply virtual Compton scattering—adds the merits of these two classes of reactions, with a large cross section at large energy and an excellent resolution of the nucleon’s interior. It is well suited for future experiments at an electron-ion collider which is under active study recently [16,17,18]
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