Scientists at Fermilab near Chicago have edged closer to potentially uncovering a fifth force of nature, a discovery that could herald a revolution in physics. The findings stem from the US muon g-2 experiment, where researchers have observed that sub-atomic particles called muons are behaving in ways not predicted by the existing Standard Model of particle physics.

The experiment involves accelerating muons around a 15-meter diameter ring at nearly the speed of light, where they circulate about 1,000 times. The observed behavior of these particles may hint at a new force of nature influencing them.

Since their first suggestion of the possibility of a fifth force in 2021, the Fermilab team has refined their measurements, reducing uncertainty by a factor of two. Dr. Brendan Casey, a senior scientist at Fermilab, said, “We’re really probing new territory. We’re determining the measurements at a better precision than it has ever been seen before.”

While the evidence is strong, conclusive proof remains elusive. The goal posts for the experimental physicists have been moved due to developments in theoretical physics. However, the researchers believe they will have the required data within two years, although a rival team at Europe’s Large Hadron Collider (LHC) is also in the race.

Dr. Mitesh Patel from Imperial College London stated that finding results inconsistent with the Standard Model would mark “one of the all-time breakthroughs in physics.” The next set of Fermilab results is eagerly anticipated as “the ultimate showdown” between theory and experiment, possibly unveiling new particles or forces.

If confirmed, the discovery of a fifth force would represent one of the most significant scientific breakthroughs in a century. Such a force and associated particles would not fit into the current Standard Model of particle physics, opening new doors to our understanding of the universe, including phenomena like dark energy and dark matter.

The complete findings are detailed in here

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