| ATLAS Note | |
| Report number | ATL-PHYS-PROC-2024-037 |
| Title | Recent results from ultra-peripheral lead-lead collisions with ATLAS |
| Author(s) | Maj, Klaudia (AGH University of Krakow (PL)) |
| Corporate Author(s) | The ATLAS collaboration |
| Collaboration | ATLAS Collaboration |
| Publication | 2024 |
| Imprint | 20 May 2024 |
| Number of pages | mult. |
| In: | 13th International "Hiroshima" Symposium on the Development and Application of Semiconductor Tracking Detectors, Vancouver, Canada, 3 - 8 Dec 2023 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LHC ; ATLAS |
| Free keywords | ultra-peripheral collisions ; photon-induced processes ; exclusive dilepton production ; anomalous magnetic moment ; photonuclear dijet production ; charged hadron ; QGP ; HEAVYIONS |
| Abstract | Relativistic heavy-ion beams at the LHC are accompanied by a large flux of equivalent photons, leading to multiple photon-induced processes.\ This report presents a series of measurements of such processes performed by the ATLAS Collaboration. Measurements of exclusive dilepton production (electron, muon, and tau pairs) are discussed.\ These processes provide strong constraints on the nuclear photon flux and its dependence on the impact parameter and photon energy.\ In particular, measurements of the cross-sections in the presence of forward neutrons provide an additional experimental handle on the impact parameter range sampled in the observed events.\ Furthermore, the tau-pair production measurements can constrain the tau lepton's anomalous magnetic dipole moment. High statistics measurements of light-by-light scattering shown in this talk provide a precise and unique opportunity to investigate extensions of the Standard Model, such as the presence of axion-like particles.\ The measurement of charged hadron in photonuclear collisions using 5.02 TeV Pb+Pb data collected in 2018 by ATLAS is also discussed. The charged hadron particle yields are presented as a function of pseudorapidity and transverse momentum in different categories of event multiplicity. Measurement of jet production in UPCs performed with the ATLAS detector using high-statistics 2018 Pb+Pb data is presented. |
Record created 2024-05-20, last modified 2024-05-21