Work

Dijet photoproduction and transverse-plane geometry in ultra-peripheral nucleus-nucleus collisions

Year: 2024

Type: conference-paper

Abstract: We present new NLO pQCD predictions for the inclusive photoproduction of dijets in ultra-peripheral (UPC) lead-lead collisions at 5.02 TeV with a realistic impact-parameter dependent effective photon flux obtained through the Woods-Saxon nuclear profile. For the first time in NLO inclusive UPC dijet predictions, we take into account also the modelling of the forward-neutron event class required in the experimental measurements. We show that since the dijet photoproduction at forward rapidities requires an energetic photon in the initial state, this biases the cross section to be dominated by events with relatively small impact parameters between the nuclei, of the order of a few nuclear radii. This leads to a sensitivity to the transverse-plane collision geometry, which we take properly into account by including effects from the finite extent of both the photon-emitting and the target nucleus. We also test the potential sensitivity to the spatial dependence of nuclear parton distribution functions in connection with this finding.

DOI: 10.22323/1.469.0167

Authors: Petja Kalle Matias Paakkinen, Kari Eskola, Vadim Guzey, Ilkka Helenius, Hannu Paukkunen

Institutions: University of Jyväskylä, Helsinki Institute of Physics, University of Helsinki

Language: English

Topic: High-Energy Particle Collisions Research

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Funders: China Scholarship Council, H2020 European Research Council

Award: Yoctosecond imaging of QCD collectivity using jet observables

OpenAlex ID: W4405848362

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