May 22 – 26, 2023
IJCLab, Orsay (FRANCE)
Europe/Paris timezone

Inclusive quarkonium photoproduction

May 26, 2023, 12:15 PM
Auditorium Joliot Curie (IJCLab, Orsay (FRANCE))

Auditorium Joliot Curie

IJCLab, Orsay (FRANCE)

15, Rue G. Clemenceau 91405 Orsay Cedex FRANCE


Kate Lynch (University College Dublin (IE))


We explore the possibility to use ultra-peripheral proton-lead collisions at the LHC to study inclusive $J/\psi$ photoproduction, namely when a quasi-real photon emitted by the fully stripped lead ion breaks a proton to produce the $J/\psi$. Owing to the extremely large energies of the colliding hadrons circulating in the LHC, the range of accessible $W_{\gamma p}$ largely exceed what has been and will be studied at lepton-hadron colliders like HERA and the EIC. We obtain a leading-order inclusive-photoproduction cross section of order 50 $\mu$b, which we find large enough to be measured by CMS and LHCb. In addition, we find that inclusive-photoproduction can be isolated from possible hadroproduction processes by imposing the absence of significant activity in the lead-going direction, and may be further isolated by imposing rapidity-gap based cuts on detector activity. We estimate the background-to-signal ratio to be of order 0.001 and 0.01 at CMS and LHCb, respectively. In addition, we propose a method similar to the Jacquet-Blondel Method to reconstruct $W_{\gamma p}$ and the elasticity ($z$). Reconstructing these variables will allow kinematic regions to be defined that minimise theoretical uncertainty. We find that $z$ can be reconstructed with a resolution of 0.1, 0.15, and 0.2 in LHCb Pb$p$, CMS, and LHCb $p$Pb, respectively, where Pb$p$ and $p$Pb imply opposite beam directions.

Primary author

Kate Lynch (University College Dublin (IE))

Presentation materials