PICO reports first possible dark matter detection this month

Earlier this month, researchers at a conference in Japan reported a potential detection of dark matter, a substance comprising nearly 85% of all matter in the universe, a finding made possible by materials pushed to physical extremes. The possible signal originated from flashes of light recorded deep underground in a vat of ultrapure liquid xenon, an event the research team has yet to explain through conventional means. “I’m a chemist working amongst a bunch of physicists,” says Isaac Arnquist, a chemist at Pacific Northwest National Laboratory, “I could never have imagined that my studies in chemistry would result in me being a vital member of physics collaborations searching for dark matter.” While a single observation isn’t conclusive, this finding represents a potential first direct proof of dark matter’s existence, after decades of indirect evidence. The LUX-ZEPLIN (LZ) detector registered a single particle interaction earlier this month that researchers believe may have been generated by dark matter, prompting intense scrutiny of the data and the detector’s ultra-pure components. This potential signal, recorded deep within the Sanford Underground Research Facility in Lead, South Dakota, has survived initial checks designed to eliminate background noise and known particle interactions. While definitive confirmation remains elusive,…