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T: Fachverband Teilchenphysik

T 26: Methods in Particle Physics II

T 26.1: Vortrag

Dienstag, 17. März 2026, 16:15–16:30, KH 00.020

Luminosity Calibration in the 2025 Oxygen Runs for the ATLAS Experiment using van der Meer Scans — •Jon Hoxha, Cigdem Issever, and Clara Elisabeth Leitgeb — Humboldt-Universität zu Berlin

The ATLAS experiment is a general-purpose detector at the Large Hadron Collider (LHC) at CERN, which conducts precise measurements for a wide range of physics phenomena. To obtain precise cross-section measurements, it is crucial to properly calibrate the luminosity detectors. ATLAS employs dedicated van der Meer (vdM) scan sessions to calibrate them, during which interaction rates are measured in certain beam conditions. Most importantly, during these scans, the beams are transversely separated in a controlled manner to understand changes in the interaction rate with separation, which is ultimately used for the luminosity calibration.

This presentation will outline the methodology, the analysis workflow, and the specific challenges for the luminosity calibration of the oxygen collision runs, which were conducted in July 2025. These runs represent the first time such collisions happened at the LHC, providing unique information into the dynamics of light-ion collisions, as well as the potential for improving of the modeling of the high energy cosmic ray air showers. Particular attention will be given to the data analysis procedure.

Keywords: Luminosity Calibration; Oxygen Collision Run; van der Meer (vdM) Scans