SAIP2025

Analysis of Long-Term Stability Uncertainty in Luminosity Measurements Using the Tile Calorimeter of the ATLAS Detector for Run 3 Proton-Proton Collisions at $\sqrt{s} = 13.6$ TeV in 2023

8 Jul 2025, 10:50

20m

Solomon Mahlangu House (University of the Witwatersrand, Johannesburg)

Oral Presentation Track B - Nuclear, Particle and Radiation Physics Nuclear, Particle and Radiation Physics-2

Speaker

Phuti Rapheeha (University of the Witwatersrand)

Description

Precision luminosity measurements are crucial for determining the fundamental properties of physics processes at the Large Hadron Collider (LHC). In the ATLAS experiment, luminosity uncertainties often represent one of the leading sources of systematic uncertainty in cross-section measurements, directly impacting sensitivity to new physics searches and background estimations.

Since the calibration of the primary luminometer of ATLAS, LUCID, is performed only once per data-taking year, studying the long-term stability of LUCID luminosity measurements is crucial, as it significantly contributes to the total uncertainty in the ATLAS luminosity measurement. In this study, the Tile Calorimeter is used to evaluate and monitor the long-term stability of the luminosity measurements. Results are presented for the ATLAS detector during proton-proton ($pp$) collisions at $\sqrt{s} = 13.6$ TeV in 2023. A long-term stability uncertainty of $\delta L/L = 0.1\%$ is obtained for the 27.58 fb$^{-1}$ of data delivered to ATLAS.