Experimental Particle and Astro-Particle Physics Seminar

Monday 19 Feb 2024, 14:00 → 16:00 Europe/Zurich

Stefanos Leontsinis (University of Zurich (CH))

Abstract: 

The precise determination of luminosity is a crucial factor for a collider at its center of mass energy. The ATLAS Collaboration recently made significant strides in luminosity measurement during the entire Run 2 of the LHC (2015-2018), achieving sub-percent precision. Detectors such as LUCID-2, the tracking detector, and the calorimeter system provide relative luminosity measures during data-taking. The absolute luminosity calibration involves an annual van der Meer (vdM) beam separation scan, mapping the beam size and proton density. This calibration is extrapolated to nominal LHC physics conditions, considering systematic effects like non-factorization and beam-beam interactions. ATLAS' luminosity detectors, sensitive to data-taking variations, are monitored for stability throughout the year. In this seminar, we will delve into these various aspects and their interplay, contributing to the latest legacy measurement of the ATLAS luminosity for the entire Run 2 dataset.

 

 

zoom room link

14:00 → 15:00 Sub-percent precision: Charting new frontiers in measuring luminosity at colliders

Speaker: Claudia Seitz (Deutsches Elektronen-Synchrotron (DE))

ATLAS_luminosity_SeminarUZH2024_clseitz.pdf