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
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
