Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 61: Methods in Particle Physics III (Tracking)
T 61.7: Vortrag
Mittwoch, 2. April 2025, 17:45–18:00, VG 4.101
Tracking efficiency studies for LHCb in Run 3 — •Rowina Caspary1, Michel de Cian1, Peilian Li2, and Maurice Morgenthaler1 — 1Physikalisches Institut, Heidelberg University — 2University of Chinese Academy of Sciences (UCAS)
The LHCb experiment is dedicated but not limited to the precision measurement of particles containing b- and c-quarks. It has been collecting data with an upgraded detector and a novel software-only trigger framework since 2022 at an instantaneous luminosity up to 2×1033cm−1s−1at √s=13.6 TeV.
The correct evaluation of the track reconstruction efficiency is essential for many high-precision measurements. A tag-and-probe method is developed to estimate the track reconstruction efficiency of each tracker using muonic tracks from J/ψ→µµ decays, where hits from other detector systems are used to reconstruct the probe tracks. Discrepancies of the measured track reconstruction efficiency between simulation and data are evaluated, examined and corrected deliberately, taking into account various effects due to misalignment and inefficiency of the sub-detectors. An agreement between simulation and data at the sub-percent level is achieved over almost the entire phase space and for all tracking sub detectors, which illustrates the excellent understanding of the upgraded LHCb detector and its reconstruction sequences. This talk presents the results of the tracking efficiency methods in 2024 data and according systematic uncertainties.
Keywords: LHCb; tracking; calibration; efficiency; reconstruction