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T: Fachverband Teilchenphysik

T 31: Scintillator Detectors I

T 31.5: Talk

Tuesday, March 17, 2026, 17:15–17:30, KH 01.014

Data-based studies on the single hit efficiencies of the LHCb Scintillating Fibre Tracker — Blake Leverington, Ulrich Uwer, •Tom Wolf, Chishuai Wang, Miguel Ruiz Diaz, Giulia Tuci, Sebastian Bachmann, Xiaoxue Han, and Ya Zhao — Physikalisches Institut Universität Heidelberg

During 2019-2022 the LHCb detector was upgraded to allow operation at higher luminosity and full-detector read-out at 40 MHz. As core part of this upgrade, the Scintillating Fibre Tracker (SciFi) has been installed as the new main tracker. To detect charged tracks it makes use of 12 layers, constructed from 250 µm diameter scintillating fibres that are readout by silicon photomultipliers.

A principle performance parameter for the SciFi is the single hit efficiency, its ability to detect a hit when a particle track passes through one of its layers. To measure this value from data, charged particle tracks are reconstructed while excluding the layer under study, in which matching hits are then searched for. The efficiency is studied over the entire detector area, as well as over time and as a function of occupancy, to gauge the impact of the ionising radiation and luminosity delivered during Run 3 of the LHC.

Keywords: LHCb; Scintilating Fibres; SiPMs; Single hit efficiency; Tracking detector