Additional proof of an unknown particle from a Hungarian lab provides a new impetus to NA64 searches. Recent evidence of an unknown particle that would carry the fifth power of nature provides the NA64 collaboration at CERN, a brand new incentive to proceed searches.
In 2015, a workforce of scientists spotted a sudden glitch, or “anomaly,” in a nuclear transition that could be defined by the manufacturing of an unknown particle. A couple of years later, theorists suggested that the brand new particle might be proof of a brand new elementary power of nature, along with electromagnetism, gravity, and the robust and weak forces. The findings caught worldwide consideration and prompted, amongst different research, a direct search for the particle by the NA64 collaboration at CERN.
A new paper (pdf) from the identical staff, led by Attila Krasznahorkay on the Atomki institute in Hungary, now reviews one other anomaly, in an equal nuclear transition, the identical hypothetical particle also defines that.
The primary anomaly noticed by Krasznahorkay’s group was seen in a transition of beryllium-eight nuclei. This transition emits a high-energy digital photon that transforms into an electron and its antimatter counterpart, a positron. Inspecting the variety of electron-positron pairs at completely different angles of separation, the researchers discovered a sudden surplus of couples at a separation angle of about 140º. In distinction, the idea predicts that the variety of pairs decreases with rising separation angle, with no excess at a selected edge. Krasznahorkay and colleagues reasoned that the surplus might be interpreted by the manufacturing of a brand new particle with a mass of about 17 million electronvolts (MeV), the “X17” particle, which might remodel into an electron-positron pair.
The most recent anomaly reported by Krasznahorkay’s group, in a paper (pdf) that has but to be peer-reviewed, can be within the type of an extra of electron-positron pairs, however, this time the surplus is from a transition of helium-4 nuclei.