Science News · Wetenschap

Dark matter hunters may have finally spotted a hint of the particles

The LUX-ZEPLIN (LZ) detector may have detected a single particle interaction consistent with dark matter, according to a new analysis. While this single event is intriguing, researchers emphasize that it is not conclusive and more data is needed to confirm its origin.

The LZ detector, located in South Dakota, searches for weakly interacting massive particles (WIMPs) by looking for collisions with atomic nuclei in a liquid xenon tank. A collision would cause the nucleus to recoil, producing light and electrons that the detector's sensors can register. The recent analysis focused on a specific type of dark matter interaction that would cause a high-energy recoil.

After analyzing 220 days of data, LZ found one event that matches the expected signature for this hypothesized dark matter. This event has a statistical significance of 2.6 sigma, falling short of the 3 sigma typically required for evidence and 5 sigma for detection in physics. Theoretical physicists find the event interesting but caution that it is too early to draw firm conclusions.

This potential signal is notable because it occurred in June, aligning with the expectation that dark matter interactions might be more energetic in the summer when Earth is moving directly into the galaxy's dark matter stream. While the event doesn't fit the simplest dark matter models, it is considered plausible by some theorists.

Dark matter experiments have a history of producing promising signals that later prove to be false alarms. However, the LZ analysis demonstrates the capability of these advanced detectors to explore a wider range of dark matter scenarios. The LZ experiment has collected significantly more data, and if this event is indeed a dark matter signal, further observations may reveal additional events.

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