Physicists may have detected the first direct evidence of dark matter

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For decades, physicists have been chasing a ghost. Dark matter, an invisible substance thought to make up most of the universe’s mass, has revealed itself only through its gravitational pull on galaxies and cosmic structures. But what it actually is remains one of science’s greatest mysteries.

What has now been observed by the LUX-ZEPLIN (LZ) experiment, located deep within the Black Hills of South Dakota, in a vault of rock nearly a mile underground: a single particle interaction that doesn’t fit neatly into the catalog of known backgrounds. It’s not proof of dark matter, but it’s the most compelling hint yet from this state-of-the-art detector.

LZ is intended for detecting the very faint signals of WIMPs (Weakly Interacting Massive Particles), which are one of the main candidates for dark matter. The detector holds 10 tonnes of ultrapure liquid xenon, waiting for the rare moment when a WIMP might collide with a xenon nucleus and produce a tiny flash of light.

To shield against cosmic rays and other noise, the experiment sits under a mile of rock at the Sanford Underground Research Facility (SURF). Layers of water tanks, outer detectors, and sophisticated computational filters further strip away false signals. Outlier events are expected, but usually, they can be explained. This one is different.

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