BSM physics using photon-photon fusion processes in UPC in Pb+Pb collisions with the ATLAS detector

Author:

Klaudia Maj

Keyword:

High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex)

journal:

ATL-PHYS-PROC-2023-037

date:

2023-07-13 16:00:00

Abstract

Relativistic heavy-ion beams at the LHC are accompanied by a large flux of equivalent photons, leading to multiple photon-induced processes. This proceeding presents searches for physics beyond the Standard Model enabled by photon-photon processes in both di-tau and diphoton final states. The tau-pair production measurements can constrain the tau lepton's anomalous magnetic dipole moment (g-2), and a recent ATLAS measurement using muonic decays of tau leptons in association with electrons and tracks provides one of the most stringent limits available to date. Similarly, light-by-light scattering proceeds via loop diagrams, which can contain particles not yet directly observed. Thus, high statistics measurements of light-by-light scattering provide a precise and unique opportunity to investigate extensions of the Standard Model, such as the presence of axion-like particles.

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