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:

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

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Ministry reporting: Yes

Reporting Year: 2019

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