Conveners
Parallel 31: UPC
- Minjung Kim (University of California Berkeley (US))
The study of heavy-quark photoproduction in ultraperipheral collisions (UPC) of heavy ions provides a new tool to characterize the production mechanisms of heavy-quarks with high experimental and theoretical control, and constrain the properties of nuclear matter in a wide region of the ($x$, $Q^2$) with perturbatively-produced hard probes. In this talk, we will present the first measurement...
In ultra-relativistic heavy-ion collisions, copious rates of γγ processes are expected through the interaction of the large electromagnetic fields of the nu- clei, which enables the production of particles such as leptons, virtual axion-like particle, magnetic monopoles, or can lead to light-by-light scattering via loop diagrams, and even higher-order processes where additional photons are ex-...
In heavy ion ultraperipheral collisions (UPCs), the production of $\rm{J}/\psi$ through photon-nuclear interactions is of particular interest, as its cross section is highly sensitive to the properties of gluons within heavy nuclei. Photons can interact with the nucleus coherently (involving the entire nucleus) or incoherently (with individual nucleons). While coherent interactions probe the...
Photonuclear interactions in ultraperipheral heavy-ion collisions can be used to improve our understanding of gluonic nuclear structure In particular, coherent photoproduction of vector mesons are processes sensitive to the gluon distribution of the target nucleus, especially at small values of the parton momentum fraction x, where the onset of gluon saturation effects is expected. A...
In relativistic heavy ion collisions, the charged ions produce an intense flux of equivalent photons. Thus, photon-induced processes are the dominant inter- action mechanism when the colliding nuclei have a transverse separation larger than the nuclear diameter. In these ultra-peripheral collisions (UPCs), the pho- ton provides a clean, energetic probe of the partonic structure of the nucleus,...
