2 New Subatomic Particles Found By CERN Scientists – 20 November 2014

RT logoCERN’s Large Hadron Collider scientists have discovered two new subatomic particles each made from three quarks bound together by the strong force. They were predicted to exist by the Standard Model of particle physics.

Officials at the lab on the French-Swiss border known by its French acronym CERN announced the discovery in a statement Wednesday and submitted a paper reporting the finding to Physical Review Letters.

The particles are part of the baryon family and are made from three quarks bound together – one beauty (b), one strange (S), and one down (d) quark – and are within the so-called “Standard Model” theory, which explains the building blocks of matter.

The particles are known as Xi_b’- and Xi_b*- and although scientists had predicted their existence they had never actually been seen before. A related particle called Xi_b*0 was found in 2012.

“Nature was kind and gave us two particles for the price of one. The Xi_b’- is very close in mass to the sum of its decay products: if it had been just a little lighter, we wouldn’t have seen it at all using the decay signature that we were looking for,” said Matthew Charles, of the LPNHE laboratory at Paris VI University, a CERN collaborator.

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