Amplitude-level NLO predictions for exclusive J/ψ+γ production in ultraperipheral collisions
Abstract
Exclusive γγ→ J/ψ+γ production is studied in the color-singlet channel at leading order in the heavy-quark velocity. The conventional next-to-leading-order (NLO) result B+V, comprising Born production and its interference with the renormalized one-loop amplitude, is compared with B+V+Q, where Q retains the complete one-loop square. At photon-photon energies W=80 GeV and 160 GeV, the conventional spectrum becomes negative over finite high-pT intervals already at renormalization scale μR=W, whereas the complete square remains non-negative. In contrast, the total partonic cross section exceeds Born at the larger energies in the energy scan, owing to positive virtual contributions from other scattering directions. For p-p collisions at 14 TeV and Pb-Pb collisions at √(sNN)=5.52 TeV, Q raises the central integrated ultraperipheral rates by 11.6%--18.4%. Their absolute scale widths over μR={W/2,W,2W} decrease by 36%--67%. Retaining the complete one-loop square changes both the predicted integrated rates and the shapes of the differential distributions.
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BibTeX
@misc{zhan2026amplitudelevel,
title = {{Amplitude-level NLO predictions for exclusive $J/ψ+γ$ production in ultraperipheral collisions}},
author = {Xi-Jie Zhan and Tai-Fu Feng and Xing-Gang Wu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.04293},
eprint = {2610.04293},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.04293},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Amplitude-level NLO predictions for exclusive J/ψ+γ production in ultraperipheral collisions
AU - Xi-Jie Zhan
AU - Tai-Fu Feng
AU - Xing-Gang Wu
PY - 2026
DA - 2026/10/03
PB - arXiv
DO - 10.48550/arxiv.2610.04293
UR - https://arxiv.org/abs/2610.04293
AB - Exclusive γγ→ J/ψ+γ production is studied in the color-singlet channel at leading order in the heavy-quark velocity. The conventional next-to-leading-order (NLO) result B+V, comprising Born production and its interference with the renormalized one-loop amplitude, is compared with B+V+Q, where Q retains the complete one-loop square. At photon-photon energies W=80 GeV and 160 GeV, the conventional spectrum becomes negative over finite high-p_T intervals already at renormalization scale μ_R=W, whereas the complete square remains non-negative. In contrast, the total partonic cross section exceeds Born at the larger energies in the energy scan, owing to positive virtual contributions from other scattering directions. For p-p collisions at 14 TeV and Pb-Pb collisions at √(s_NN)=5.52 TeV, Q raises the central integrated ultraperipheral rates by 11.6%--18.4%. Their absolute scale widths over μ_R={W/2,W,2W} decrease by 36%--67%. Retaining the complete one-loop square changes both the predicted integrated rates and the shapes of the differential distributions.
ER -