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T: Fachverband Teilchenphysik

T 31: Scintillator Detectors I

T 31.3: Talk

Tuesday, March 17, 2026, 16:45–17:00, KH 01.014

Results from the November 2025 Test Beam measurements of SHiP’s Surrounding Background Tagger prototypes — •Hannes Braune for the SHiP-SBT collaboration — Humboldt-Universität zu Berlin

The SHiP (Search for Hidden Particles) experiment, scheduled to start operation in 2032 at the CERN SPS Beam Dump Facility, aims to search for as-yet undiscovered feebly interacting long-lived particles. A large O(50 m) long decay volume filled with helium together with a spectrometer allows the reconstruction of their decay products. The decay volume is surrounded by the Surrounding Background Tagger (SBT) to tag muons entering from outside and muon or neutrino inelastic interactions in helium. The SBT consists of O(900) cells forming a continuous 20 cm thick layer of LAB+PPO liquid scintillator around the entire volume, and is read out with wavelength-shifting optical modules (WOMs) coupled to SiPM arrays. In November 2025, the long-term performance as well as different cell sizes and WOM configurations were tested in dedicated test beam measurements at the CERN PS.

Keywords: SHiP; Surrounding Background Tagger; performance studies