Speaker
Description
(ONLINE)
https://inspirehep.net/literature/1800744 https://inspirehep.net/literature/1971682 https://inspirehep.net/literature/2756727
Abstract The photons in ultra-peripheral collisions (UPCs) are highly linearly polarized and can be used as probes to test QCD phenomenology, such as nucleon structure. We studied the cos 2ϕ and cos 4ϕ modulations in diffractive vector meson and dijet production in UPCs. A theoretical description based on Fermi-scale double-slit interference was established, and the results for the cos 2ϕ asymmetry are consistent with experimental measurements from STAR and ALICE. Both the elliptic gluon Wigner distribution and final-state soft photon radiation can give rise to a cos 4ϕ azimuthal asymmetry in ρ-meson production. Additionally, we revisited diffractive dijet production in UPCs, incorporating the effects of both initial- and final-state soft gluon radiation, and obtained results that align more closely with experimental data.
