ANUBIS: Projected Sensitivities and Initial Results from the proANUBIS demonstrator with Run 3 LHC data

TL;DR

The paper presents the initial results and projected sensitivities of the proANUBIS demonstrator, a detector designed to search for long-lived particles related to dark matter, using Run 3 LHC data from the ATLAS cavern.

Contribution

It introduces the proANUBIS demonstrator, reports its first results, and evaluates its potential to detect exotic long-lived particles at the LHC.

Findings

First results from proANUBIS demonstrator data

Projected sensitivities for LLP detection models

Background studies for future ANUBIS detector deployment

Abstract

Despite the success of the Standard Model (SM) there remains behaviour it cannot describe, in particular the presence of non-interacting Dark Matter. Many models that describe dark matter can generically introduce exotic Long-Lived Particles (LLPs). The proposed ANUBIS experiment is designed to search for these LLPs within the ATLAS detector cavern, located approximately 20-30 m from the Interaction Point (IP). A prototype detector, proANUBIS, has taken data within the ATLAS detector cavern since 2024, corresponding to 104 $fb^{-1}$ of pp data. We report on the potential sensitivity of ANUBIS to a selection of LLP models, i.e. Higgs Portal and Heavy Neutral Leptons, as well as future planned studies. Additionally, we will show the first results of the proANUBIS demonstrator, and how it will be used to study the expected backgrounds for the ANUBIS detector.