A4 Article in conference proceedings
Probing nuclear PDFs with dijets in ultra-peripheral Pb+Pb collisions (2019)
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
JYU authors or editors
Publication details
All authors or editors: Helenius, I.
Parent publication: Hard Probes 2018 : International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions
Parent publication editors: d'Enterria, David; Morsch, Andreas; Crochet, Philippe
Conference:
- International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions
Place and date of conference: Aix-les-Bains, France, 1.-5.10.2018
Journal or series: POS Proceedings of Science
eISSN: 1824-8039
Publication year: 2019
Number in series: 345
Article number: 118
Publisher: Sissa Medialab srl
Publication country: Italy
Publication language: English
DOI: https://doi.org/10.22323/1.345.0118
Publication open access: Openly available
Publication channel open access: Open Access channel
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/65917
Publication is parallel published: https://arxiv.org/abs/1811.10931
Abstract
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.
Keywords: particle physics; nuclear physics
Contributing organizations
Related projects
- Applications of perturbative Quantum Chromo Dynamics in high-energy nuclear collisions
- Paukkunen, Hannu
- Academy of Finland
Ministry reporting: Yes
Reporting Year: 2019
JUFO rating: 0