| Issue |
EPJ Web Conf.
Volume 296, 2024
30th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (Quark Matter 2023)
|
|
|---|---|---|
| Article Number | 17004 | |
| Number of page(s) | 4 | |
| Section | UPC | |
| DOI | https://doi.org/10.1051/epjconf/202429617004 | |
| Published online | 26 June 2024 | |
https://doi.org/10.1051/epjconf/202429617004
Illuminating the impact-parameter dependence of UPC dijet photoproduction
1 University of Jyväskylä, Department of Physics, P.O. Box 35, 40014 University of Jyväskylä, Finland
2 Helsinki Institute of Physics, P.O. Box 64, 00014 University of Helsinki, Finland
* Speaker, e-mail: petja.k.m.paakkinen@jyu.fi
Published online: 26 June 2024
We present new NLO pQCD predictions for photoproduction of dijets in ultraperipheral PbPb collisions at 5.02 TeV with a realistic photon flux and up-to-date nuclear PDFs. Our calculation of the impact parameter dependence of the photon flux includes the effects of the nuclear form factor in the photon-emitting nucleus and the spatial dependence of nuclear PDFs of the target nucleus, which are estimated using theWood-Saxon nuclear density profile. We show that a significant portion of the measured dijets at large zγ originate from events with impact parameters of the order of a few nuclear radii, and that the cross section predictions therefore become sensitive to the modelling of the nuclear geometry and photon flux close to the source nucleus.
© The Authors, published by EDP Sciences, 2024
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