Scientists have obtained an important hint in the search for dark matter—one of the greatest mysteries of the Universe. A specialized detector installed in a laboratory located about a mile underground in the United States registered a mysterious particle. Although this particle may be related to dark matter, scientists do not consider it a definitive discovery yet.
This signal was recorded by the LZ detector. Over two years, approximately 250 scientists and engineers analyzed the data collected. These researchers represent 39 institutions from six different countries. During the analysis, a particle was found that collided with an atom. Scientists hypothesize that this could be a WIMP (Weakly Interacting Massive Particle), which is considered a likely candidate for dark matter.
This detector is situated in the Sanford Underground Research Facility in South Dakota, USA. The laboratory is located about a mile beneath the Earth's surface. Placing the detector at such a depth reduces the influence of other particles coming from above, allowing scientists to capture extremely weak signals.
The LZ detector is designed to register interactions of extremely small particles. Simply put, it attempts to record a tiny signal that occurs when a dark matter particle collides with an atom.
It is premature to claim a discovery at this time. Scientists have only recorded one incident that might be related to dark matter. One case is not enough to prove that it is specifically dark matter. This signal received a rating of 2.6 sigma, which helps understand the reliability of the result.
A level of 5 Sigma is usually required for recognizing a major scientific discovery. Therefore, the signal obtained requires further confirmation. Professor Rick Gatskel of Brown University also noted that the team is not claiming a discovery of dark matter; according to him, they have seen something interesting, but further research is needed for a complete understanding.
Dark matter is matter that cannot be seen directly. It does not emit or reflect light in the usual way, making direct observation extremely difficult. Nevertheless, scientists believe that dark matter exists because its gravity affects other objects. According to scientists' estimates, dark matter may constitute about 85 percent of all matter in the Universe. Despite this enormous volume, scientists have so far failed to catch a single dark matter particle, making this recent signal highly significant.
Scientists also conducted checks to rule out the possibility that the signal could have arisen for some other reason. According to Professor Henning Fletcher of the University of Bristol, the team spent a lot of time searching for alternative explanations. So far, they have not found a cause that could fully explain this anomaly.
Scientists will now continue to study additional data coming from the LZ detector. If similar multiple signals appear in the future, and their statistical indicators reach the 5 sigma level, this could strengthen the claim of a dark matter discovery. At present, scientists have discovered not dark matter itself, but only its potential trace, and only further research will determine whether it was truly dark matter or an event related to another particle.