Scientists Detect First Potential Signal of Dark Matter

A detector containing 10 tonnes of ultra-pure liquid xenon has recorded a single unusual event in the region where scientists would expect a dark matter signal. The result may offer the first potential clue of its kind, but researchers stress that it is not yet a discovery.

The detector operates deep underground, where the surrounding rock helps shield it from interference. Scientists analyzed 220 days of data collected between March 2023 and April 2024 and found one event that stood out from known background sources.

The event had a statistical significance of 2.6 sigma, meaning the probability of a random coincidence was about 0.5 percent. It could correspond to a WIMP, a proposed dark matter particle with a mass of at least 200 gigaelectronvolts, or more than 200 times the mass of a proton.

Particle physicists require a five-sigma significance level before claiming an official discovery. A single event could still result from a rare background process that scientists have not explained. More observations will provide the test: a real signal should grow stronger as researchers collect additional data, while a statistical fluctuation should disappear.

Dark matter accounts for about 85 percent of all matter in the Universe, yet it has never been directly detected. It does not emit light and has so far revealed itself only through its gravitational effects. “For now, the decades-long hunt for dark matter continues, and its outcome could determine our understanding of what the Universe is actually made of,” the outlet noted.

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For now, the decades-long hunt for dark matter continues, and its outcome could determine our understanding of what the Universe is actually made of.