Diffraction and Vector Mesons Working Group Summary

TL;DR: The physics case, the resulting detector requirements, and the evolving detector concepts for the experimental program at the Electron-Ion Collider are described, providing the basis for a world-class experimental program that aims to increase the understanding of the fundamental structure of all visible matter.

TL;DR: In this article, the authors demonstrate that the timelike deeply virtual Compton scattering (TCS) mechanism gamma q -> l+l- q dominates in some accessible kinematical regions, thus opening a new way to study generalized parton distributions (GPD) in the nucleon at small skewedness.

TL;DR: In this article, a new set of diffractive parton distribution functions is obtained through a simultaneous fit to the diffractive inclusive and dijet cross sections, which allows for a precise determination of both diffractive quark and gluon distributions in the range 0.05 < zIP < 0.9.

TL;DR: In this article, a measurement of elastic deeply virtual Compton scattering ∗p → p using e−p collision data recorded with the H1 detector at HERA is presented, which corresponds to an integrated luminosity of 145 pb−1.

TL;DR: In this article, a detailed analysis of the diffractive deep-inelastic scattering process is presented, where the cross section is measured for photon virtualities in the range $3.5 \leq Q^2 \leqs 1600 \rm GeV^2, triple differentially in $\xpom$, $Q^2$ and $\beta = x / \xpom", where x$ is the Bjorken scaling variable.