Proceedings

Luminosity is a fundamental parameter in any particle collider, linking measured event rates to cross sections of physics processes. In this contribution, the key ingredients of the ATLAS luminosity determination are outlined, with a focus on measurements performed with the Inner Detector in Run 3 of the LHC. [...]

Many theories beyond the Standard Model predict new phenomena giving rise to multijet final states. These jets can originate from the decay of heavy resonances into Standard Model quarks or gluons, or from more complex decay chains involving dark-sector particles. [...]

Synchrotron radiation sources play a vital role in the study of cultural and natural heritage, enabling non-destructive analysis of archaeological artifacts, historical objects, artworks, and human remains. The SESAME synchrotron radiation facility in Jordan fosters scientific collaboration among Middle Eastern and international researchers and provides advanced analytical capabilities in a region rich in cultural heritage. [...]

FLASH, the world’s first XUV and soft X-ray freeelectron laser is a user facility since 2005 and operates two SASE beamlines in parallel: FLASH1 and FLASH2, since 2014. In the FLASH2 main undulator beamline radiation down to 3.2 nm wavelength in the fundamental has been demonstrated. [...]

We present a detailed study of the precision calculations of higher-order contributions to effective potential with the application of three-dimensional effective field theories (3D EFTs). Our work focuses on the thermodynamic quantification and description of electroweak phase transitions in the early Universe for the complex singlet extended Standard Model (cxSM). [...]

Relativistic heavy-ion beams at the LHC are accompanied by a large flux of equivalentphotons, leading to photon-induced processes. Measurements of photon-induced production of taulepton pairs can be used to constrain the tau lepton’s anomalous magnetic dipole moment (g-2).A recent ATLAS measurement using muonic decays of tau leptons in association with electrons andtracks is presented. [...]

Semileptonic 𝐵-meson decays involving the quark transition 𝑏 → 𝑐𝑙𝜈 provide excellent sensi-tivity to probe potential lepton-flavour universality violation. This work introduces two recentmeasurements related to tests of light-lepton flavour universality using a data sample collected atthe Υ(4𝑆) resonance on the Belle II experiment corresponding to an integrated luminosity of 189fb−1. [...]