The active muon shield in the SHiP experiment

Abstract

The SHiP experiment is designed to search for very weakly interacting particles beyond the Standard Model which are produced in a 400 GeV/c proton beam dump at the CERN SPS. An essential task for the experiment is to keep the Standard Model background level to less than 0.1 event after $2\times 10^{20}$ protons on target. In the beam dump, around $10^{11}$ muons will be produced per second. The muon rate in the spectrometer has to be reduced by at least four orders of magnitude to avoid muon-induced combinatorial background. A novel active muon shield is used to magnetically deflect the muons out of the acceptance of the spectrometer. This paper describes the basic principle of such a shield, its optimization and its performance.

arXiv comment8 pages, 5 figures; added clarifications to the penalty function and emphasized that we care about neutrino interactions in the air

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• The Magnet of the Scattering and Neutrino Detector for the SHiP experiment at CERN
• Design Development for the Beam Dump Facility Target Complex at CERN
• Right-handed neutrinos: the hunt is on!
• Search for new physics with the SHiP experiment at CERN
• The SHiP experiment and the RPC technology
• Segmentation of EM showers for neutrino experiments with deep graph neural networks
• Data-Driven Predictions for Dark Photon and Millicharged Particle Production
• Global Optimisation of Black-Box Functions with Generative Models in the Wasserstein Space