Searches for long-lived particles with the ANUBIS experiment

Abstract: In recent years, there has been growing interest in the search for long-lived particles (LLPs), as predicted by various extensions of the Standard Model (SM). The AN Underground Belayed In-Shaft search experiment (ANUBIS) was proposed to search for such particles by instrumenting CERN's ATLAS underground cavern with tracking detectors. This report provides an overview of the current efforts to realize the ANUBIS project focusing on the latest optimized detector geometry and the installation of proANUBIS -- a prototype or proof-of-concept demonstrator. The latter aims to offer insights into anticipated backgrounds for the ANUBIS experiment and demonstrate the feasibility of such a project. The ongoing efforts are needed to contribute to the continuous optimization and development of the ANUBIS project.