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Dr. Shawn Westerdale
Princeton University

Abstract

Dark matter comprises 27% of the energy density of the universe -- about 5 times more than baryonic matter. Despite this abundance, its nature remains a complete mystery. While several theories predict different dark matter candidates, no experimental evidence to date can confirm any of them. Many experimental efforts are currently underway, aiming to directly detect some of the most promising candidates — a challenge akin to finding a needle in a haystack. To accomplish this, large detectors can be built deep underground, where backgrounds are greatly reduced. In this colloquium, I will review techniques used to search for dark matter, focusing on the DarkSide-50 and DEAP-3600 liquid argon-based detectors. I will discuss significant advances that have been made in reducing backgrounds for these dark matter searches and in improving liquid argon detector technology, paving the way for a future set of detectors to probe low- and high-mass candidates. 

Dr. Westerdale is a candidate for the tenure-track faculty position in Particle Astrophysics.  Faculty are encouraged to meet with Dr. Westerdale during his 2 days of visits.  Students and postdocs are welcome to join for a catered lunch immediately following the colloquium in Stirling 201.