Scientists from the international XENON collaboration announced that data from their XENON1T, the world’s most sensitive dark matter experiment, show a surprising excess of events. The scientists say to have observed an unexpected rate of events, the source of which is not yet fully understood. The signature of the excess is similar to what might result from a tiny residual amount of tritium (a hydrogen atom with one proton and two neutrons), but could also be a sign of something more exciting—such as the existence of a new particle known as the solar axion or the indication of previously unknown properties of neutrinos.

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Read the pre-print:Observation of Excess Events in the XENON1T Dark Matter Experimentby XENON Collaboration

Video (in Italian) from Media Inaf