Speaker
Description
The Large Hadron Collider (LHC) may be producing a significant number of neutral Long-Lived Particles (LLPs) with masses above a GeV, yet these elusive particles could be escaping detection by the main experiments. To bridge this gap, we propose the MATHUSLA detector (MAssive Timing Hodoscope for Ultra-Stable neutraL pArticles), a dedicated surface-based experiment positioned above CMS, designed to operate during the High-Luminosity LHC era. MATHUSLA consists of multiple layers of plastic scintillators with wavelength-shifting fibers coupled to silicon photomultipliers, surrounding a large, air-filled decay volume. The Conceptual Design Report (CDR) of a 40-meter MATHUSLA detector (MATHUSLA40) has been published on arxiv in March 2025. We will present the design of MATHUSLA40, as well as background studies of rare Standard Model processes and provide measurements of the "demonstrator modules" at the University of Victoria and the University of Toronto.
