The Belle II international collaboration has published its first results in a paper selected as an Editors’ Suggestion in Physical Review Letters. The paper reports the first search for a new type of elementary particle that may act as a “portal” between ordinary matter and dark matter, which is understood to make up some 85% of the matter in the universe. Cosmological observations in recent years provide strong evidence that only 15% of the mass of the matter of the universe is known to us, while the remaining 85% is composed of some still undetected and mysterious particles known as dark matter. A great deal of effort in the international particle physics community, including the Belle II experiment, is now focused on finding evidence of dark matter particles.
The Belle II experiment, which operates at the SuperKEKB electron-positron collider in Tsukuba, Japan, searched for a hypothetical new particle called the Z’ that may act as a “portal” between ordinary matter and dark matter. Belle II data collected in 2018 shows no evidence of the Z’, setting new limits on the properties of such a particle.
Plan A: Vidyo