0619756 - FZÚ 2026 RIV US eng J - Journal Article
Aad, G. - Aakvaag, E. - Abbott, B. - Chudoba, Jiří - Federičová, Pavla - Hejbal, Jiří - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Nechanský, Filip - Němeček, Stanislav - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2895 authors
Measurement of photonuclear jet production in ultraperipheral Pb+Pb collisions at √s_NN=5.02  TeV with the ATLAS detector.
Physical Review D. Roč. 111, č. 5 (2025), č. článku 052006. ISSN 2470-0010. E-ISSN 2470-0029
R&D Projects: GA MŠMT(CZ) EH22_008/0004632
Research Infrastructure: CERN-CZ III - 90240
Institutional support: RVO:68378271
Keywords : LHC * ATLAS * CERN * photons
OECD category: Particles and field physics
Impact factor: 4.6, year: 2023 ; AIS: 1.057, rok: 2023
Method of publishing: Open access
DOI: https://doi.org/10.1103/PhysRevD.111.052006

In ultrarelativistic heavy ion collisions at the LHC, each nucleus acts a sources of high-energy real photons that can scatter off the opposing nucleus in ultraperipheral photonuclear (γ+A) collisions. Hard scattering processes initiated by the photons in such collisions provide a novel method for probing nuclear parton distributions in a kinematic region not easily accessible to other measurements. ATLAS has measured production of dijet and multijet final states in ultraperipheral Pb+Pb collisions at √sNN=5.02  TeV using a dataset recorded in 2018 with an integrated luminosity of 1.72  nb-1. Photonuclear final states are selected by requiring a rapidity gap in the photon direction, this selects events where one of the outgoing nuclei remains intact. Jets are reconstructed using the anti-kt algorithm with radius parameter, R=0.4. Triple-differential cross sections, unfolded for detector response, are measured and presented using two sets of kinematic variables. The first set consists of the total transverse momentum (HT), rapidity, and mass of the jet system. The second set uses HT and particle-level nuclear and photon parton momentum fractions, xA and zγ, respectively.
Permanent Link: https://hdl.handle.net/11104/0366400