2025/04/21 by Yang, Hao, Chen, Zi-Qiang, Long, Bingwei
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2504.14850
We study the exclusive double charmonium (J/ψ- J/ψ and ηc - ηc) production through photon-photon fusion via ultraperipheral collision (UPC) at the HL-LHC and FCC with next-to-leading order (NLO) QCD predictions in the framework of non-relativistic QCD (NRQCD). Numerical results indicate that the NLO corrections for J/ψ pair are large and negative, while positive for ηc pair. The total cross section of J/ψ- J/ψ (ηc - ηc) in Pb-Pb UPC is 28.0 (65.1) nb at nucleon-nucleon c.m. energy √sNN = 5.52 TeV. Due to the backgrounds from various QCD interactions at UPC are highly suppressed and the event topologies for charmonium pair are easy to tag, the phenomenological studies at the LHC and FCC are feasible. The detailed transverse momentum pT, diphoton invariant mass mγγ and the rapidity difference Δy distributions are given. The production for X(6900) is also discussed.