Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 19: Methods in particle physics 2 (alignment, luminosity)

T 19.4: Vortrag

Montag, 4. März 2024, 16:45–17:00, Geb. 30.41: HS 1

Illuminating heavy ion collisions with tracks: Track-based measurements of the luminosity of Pb+Pb collisions with the ATLAS detector — •Kartik Deepak Bhide, Valerie Lang, and Markus Schumacher — Albert-Ludwigs-Universität Freiburg

Precisely determining the luminosity of collisions delivered by the LHC is the goal of the ATLAS luminosity program. The dedicated sub-detector LUCID is used as the reference luminometer for all types of colliding beams. In p+p collisions, several other sub-detectors and algorithms are used for calibration, cross-checks and long-term stability, both during the LHC Run 2 (2015-2018) and Run 3 (since 2022). In contrast, for heavy ion collisions, mainly luminosity algorithms based on LUCID were available during the LHC Run 2.

In this work, the potential of luminosity measurements using particle tracks reconstructed with the ATLAS Inner Detector, as a new luminometer for heavy ion collisions in the LHC Run 3 will be discussed. The performance of two track-based luminosity algorithms, namely track counting and event counting, will be presented, using Pb+Pb collision data recorded in 2023. The impact of the track selection requirements on the performance of the algorithms, and the statistical precision achieved will be shown. Comparisons to LUCID and Zero Degree Calorimeter-based luminosity will be presented.

Keywords: Luminosity; Heavy Ions; Track Counting & Event Counting; ATLAS