# Ultra-peripheral-collision studies in the fixed-target mode with the proton and lead LHC beams **Authors:** N. Yamanaka, C. Hadjidakis, D. Kikola, J.P. Lansberg, L. Massacrier,, M.G. Echevarria, A. Kusina, I. Schienbein, J. Seixas, H.S. Shao, A. Signori,, B. Trzeciak, S.J. Brodsky, G. Cavoto, C. Da Silva, F. Donato, E.G. Ferreiro,, I. Hrivnacova, A. Klein, A. Kurepin, C. Lorce, F. Lyonnet, Y. Makdisi, S., Porteboeuf, C. Quintans, A. Rakotozafindrabe, P. Robbe, W. Scandale, N., Topilskaya, A. Uras, J. Wagner, Z. Yang, A. Zelenski arXiv: 1902.06642 · 2019-02-19 ## TL;DR This paper explores the potential of fixed-target ultra-peripheral collisions at the LHC to measure gluon distributions, focusing on exclusive J/psi photoproduction with polarized targets. ## Contribution It proposes a novel approach to study gluon generalized parton distributions using fixed-target ultra-peripheral collisions at the LHC. ## Key findings - Feasibility of measuring E_g(x,xi,t) in exclusive J/psi production - Potential to access gluon GPDs with polarized hydrogen targets - Insights into gluon structure in protons and nuclei ## Abstract We address the physics case related to the studies of ultra-peripheral pH, pPb, PbH, and PbPb collisions in the fixed-target mode at the LHC. In particular, we discuss how one can measure the gluon generalized parton distribution E_g(x,xi,t) in exclusive J/psi photoproduction with a transversely polarized hydrogen target. ## Full text _Full body text omitted from this summary view._ Fetch the complete paper as Markdown: https://tomesphere.com/paper/1902.06642/full.md ## Figures 9 figures with captions in the complete paper: https://tomesphere.com/paper/1902.06642/full.md ## References 20 references — full list in the complete paper: https://tomesphere.com/paper/1902.06642/full.md --- Source: https://tomesphere.com/paper/1902.06642