The Lowdown Hub

Key to how the universe works may have been discovered The particle breakthrough at the Large Hadron

Researchers have announced 'intriguing' results that potentially cannot be explained by the current laws of nature

The particule breakthrough at the Large Hadron Collider may help explain some of the deepest puzzles in modern physics.

The key to understanding how the universe works may have been discovered by scientists at the Large Hadron Collider, in a breakthrough hailed as the most exciting in 20 years. Particle physicists have seen signs that a mystery particle or force is interacting with other particles in a manner never witnessed before.

It may explain some of the deepest puzzles in modern physics, such as what dark matter is made from, or why there is an imbalance of matter and antimatter in the universe. Currently, scientists understand the universe using The Standard Model, a theory that describes all the known fundamental particles and the forces that they interact with. It sets out the workings of the building blocks of nature: quarks, leptons, force-carrier particles, and the Higgs boson.

But the Standard Model breaks down when it comes to explaining crucial issues such as gravity or why the expansion of the universe is accelerating.

It also cannot account for dark matter, an invisible substance that makes up 27 percent of the mass of the universe and is thought to hold galaxies together.

  • The discovery of a new force in nature is the holy grail of particle physics

To find out what is going on, scientists at the Large Hadron Collider created particles known as Beauty Quarks which existed soon after the Big Bang but which decay quickly into electrons and muons, and now no longer exist in nature.

But they discovered they are not behaving in the way they expected. Under the Standard Model, Beauty quarks should decay into particles called K+mesons which have either two muons or two electrons.

Scientists found that for every 100 mesons with electrons, there were just 85 with muons, something that cannot happen under the Standard Model.

It suggests never-before-seen particles or forces are tipping the scales away from muons.

  • A graphic by Imperial College London showing a very rare decay of a beauty meson involving an electron and positron

Dr. Paula Alvarez Cartelle, of the University of Cambridge, one of the team leaders, said: “This new result offers tantalizing hints of the presence of a new fundamental particle or force that interacts differently with these different types of particles.

“The more data we have, the stronger this result has become. This measurement is the most significant in a series of results from the past decade that all seem to line up – and could all point towards a common explanation.

“The results have not changed, but their uncertainties have shrunk, increasing our ability to see possible differences with the Standard Model.”

Scientists say the latest result offers the first evidence that there could be something wrong with our current understanding of particle physics.

But there are still concerns it may be a fluke, and the Bristol University particle physics group is currently trying to confirm the results.

Dr. Konstantinos Petridis of the University of Bristol’s School of Physics, one of the physicists behind the measurement, said: “This has been a seven-year saga. Over this period, we have been seeing clues of a new unexplained process at work, but the effects were too subtle to draw any conclusions.

“We are very excited about this result but remain cautious as well.

“The discovery of a new force in nature is the holy grail of particle physics. Our current understanding of the constituents of the universe falls remarkably short – we do not know what 95 percent of the Universe is made of or why there is such a large imbalance between matter and anti-matter.”

The experiment is expected to start collecting new data next year, following an upgrade to the detector.

The result was announced today at the Moriond Electroweak Physics conference and published as a preprint.