An international team of scientists has revealed a mysterious signal detected by one of the world's most sensitive dark matter detectors, a finding that opens the door to understanding the nature of one of the universe's greatest mysteries.
Scientists have detected an unusual interaction in the LUX-ZEPLIN (LZ) experiment, a massive scientific experiment dedicated to searching for dark matter, but they cannot yet definitively pinpoint the source of this signal. The team believes one possibility is that it resulted from a dark matter particle colliding with an ordinary atom.
This finding is of great interest because, if confirmed, it could provide evidence that dark matter is composed of particles whose effects can be directly detected. However, scientists emphasize that what they have observed is not yet sufficient to declare the discovery of dark matter.
Scientists spent two years analyzing data from the LZ experiment, which involved about 250 scientists and engineers from 39 institutions in six countries.
The detector operates at a depth of approximately one mile below the surface of the earth in the US state of South Dakota, and contains about 10 tons of ultra-pure liquid xenon.
The experiment relies on searching for extremely faint flashes of light that could be produced when a dark matter particle collides with a xenon atom. The detector's placement beneath a thick layer of rock helps protect it from cosmic rays, while other instruments and sophisticated computer systems are used to filter out signals produced by ordinary matter.
Upon analyzing the data, scientists found one remarkable event that appeared in the region where they expected to find signals associated with dark matter, while known background sources were extremely low.
Scientists believe this event was caused by a particle known as the weakly interacting massive particle (WIMP), which is one of the leading candidates to explain the nature of dark matter.
Dr. Sam Eriksen, from the University of Bristol and lead author of the study, said that scientists have been trying to understand dark matter for about a century, explaining that what the team observed could represent a first step towards understanding it as particles.
However, the result is still far from the level of evidence required to declare a scientific discovery. The statistical significance of the event was 2.6 sigma, which means that the probability of a similar event occurring as a result of known background processes is about 0.5%.
Physicists usually require reaching a 5 sigma level before considering the result a confirmed discovery, so scientists are treating the current signal with caution.
Professor Rick Gaitskell of Brown University said the team was excited to see this event in the region where dark matter is expected to appear, but stressed that the existence of a single event does not allow for hasty conclusions, emphasizing that scientists do not claim to have detected dark matter, but rather found something interesting worth presenting to the scientific community.
Scientists have explored possible explanations that might link the event to a source of ordinary matter, but they have not yet found a clear explanation for it.
Dark matter is one of the greatest mysteries in cosmology. Scientists believe it makes up about 85% of all matter in the universe, but it does not interact with light in the same way as ordinary matter, and therefore cannot be seen directly with telescopes.
Ericsson presented the findings at the 2026 Astroparticle Physics Conference in Japan, and the data became available for other scientists to study and discuss. The results were also submitted to a scientific journal for publication.
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