Recent Progress and Next Steps for the MATHUSLA LLP Detector

TL;DR

This paper discusses recent advancements in the design and background understanding of the MATHUSLA LLP detector for HL-LHC, highlighting progress in simulation, R&D, and future plans to enhance sensitivity to long-lived particles.

Contribution

It provides updated background simulations, R&D results, and a roadmap toward completing the MATHUSLA detector design for HL-LHC.

Findings

Improved background understanding through detailed simulations

Successful R&D on scintillator detector performance

Progress toward completing the Technical Design Report

Abstract

We report on recent progress and next steps in the design of the proposed MATHUSLA Long Lived Particle (LLP) detector for the HL-LHC as part of the Snowmass 2021 process. Our understanding of backgrounds has greatly improved, aided by detailed simulation studies, and significant R&D has been performed on designing the scintillator detectors and understanding their performance. The collaboration is on track to complete a Technical Design Report, and there are many opportunities for interested new members to contribute towards the goal of designing and constructing MATHUSLA in time for HL-LHC collisions, which would increase the sensitivity to a large variety of highly motivated LLP signals by orders of magnitude.