Probing nuclear PDFs with dijets in ultra-peripheral Pb+Pb collisions
Helenius, I. (2019). Probing nuclear PDFs with dijets in ultra-peripheral Pb+Pb collisions. In D. d'Enterria, A. Morsch, & P. Crochet (Eds.), Hard Probes 2018 : International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (Article 118). Sissa Medialab srl. POS Proceedings of Science, 345. https://doi.org/10.22323/1.345.0118
Published inPOS Proceedings of Science
© The Authors 2019
In this talk we apply the photoproduction framework recently implemented into the PYTHIA 8 Monte Carlo event generator to study the potential of photo-nuclear dijets in ultra-peripheral Pb+Pb collisions at the LHC to further constrain the nuclear PDFs. These events can be described as γA collisions where the relevant part of the flux of quasi-real photons from heavy-ions is obtained by using the equivalent photon approximation and cutting out impact-parameter values which would lead to hadronic interactions between the beam particles. In particular, we quantify the small-x reach with different jet kinematics and show how well the values of x derived from reconstructed jet momenta are correlated with the actual values of partonic momentum fractions probed in these measurements. Also the contributions from direct and resolved photons are separately presented. To demonstrate the potential, we compare the expected experimental uncertainties to the current nuclear-PDF errors and discuss other theoretical uncertainties including the uncertainty arising from poorly-constrained photon PDFs. We find that such a measurement would potentially provide a considerable reduction of the nuclear PDF uncertainties in a region 10−4 ≲ x ≲ 10−2. ...
PublisherSissa Medialab srl
ConferenceInternational Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions
Is part of publicationHard Probes 2018 : International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions
Publication in research information system
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Related funder(s)Academy of Finland
Funding program(s)Research post as Academy Research Fellow, AoF
Additional information about fundingThe work has been supported by the Carl Zeiss Foundation and the Academy of Finland, Project 308301.
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