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The standard model of particle physics is incomplete, but experimental particle decays that occur through a ‘flavour-changing neutral current’ process, which show discrepancies to standard model predictions, may offer hints to the existence of new particles.
The mass of the axion, a particle that is central to many dark-matter theories, is calculated via the equation of state of the Universe and the temperature dependence of the so-called topological susceptibility of quantum chromodynamics.
A new measurement from the LHCb experiment at CERN's Large Hadron Collider impinges on a puzzle that has been troubling physicists for decades — namely the breaking of the symmetry between matter and antimatter.