Experiments have found that subatomic particles known as muons do not behave as predicted by current subatomic physics theory. This may indicate an unknown force acting on the muons.
All the forces we encounter every day can be reduced to four categories: gravity, electromagnetism, the strong force and the weak force. These four fundamental forces determine the interaction of all objects and particles in the universe.
The experiments were carried out in the Fermilab particle accelerator, where muons were accelerated at nearly the speed of light through a 15-meter-diameter ring.
The researchers found that muons may behave differently than current theory predicts due to a new force in nature.
While the evidence is strong, the Fermilab team isn’t sure yet. But if its results are confirmed, this discovery could be one of the greatest scientific breakthroughs of the last 100 years, because the fifth force and its associated particles are not part of the Standard Model.
Source: Ferra

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