Tau.Neutrino said:
The X17 factor: a particle new to physics might solve the dark matter mystery
http://theconversation.com/the-x17-factor-a-particle-new-to-physics-might-solve-the-dark-matter-mystery-127987
A team of scientists in Hungary recently published a paper that hints at the existence of a previously unknown subatomic particle. The team first reported finding traces of the particle in 2016, and they now report more traces in a different experiment.
more…
> This anomaly could be best be explained if the nucleus emitted an unknown particle which later “split” into an electron and a positron.
There was different thread recently that looked for something similar. The B-meson decay is being looked into in LHCb for the same reason. If the B meson decayed into an unknown lighter particle that then decayed into an electron positron pair then this would explain the lack of equipartition between mu-antimu pairs and electron-positron pairs.
Now if – and only if – the two completely different types of experiments are consistent with the same mass of new particle, then I’m prepared to say that new physics has been discovered.