29 December 2011

New sub-atomic particle discovered

The Large Hadron Collider (LHC) on the Franco-Swiss border has made its first clear observation of a new particle since opening in 2009.

Known as Chi-b (3P), it is a boson – the label given to particles that can carry the forces of nature.

The as-yet unpublished discovery is
reported on the Arxiv pre-print server.

The LHC is exploring some of the fundamental questions in “big physics” by colliding proton particles together in a huge underground facility.

Detail in the sub-atomic wreckage from these impacts is expected to yield new information about the way matter is constructed.

The Chi-b (3P) is a more excited state of Chi particles already seen in previous collision experiments, explained Prof Roger Jones, who works on the Atlas detector at the LHC.
“The new particle is made up of a ‘beauty quark’ and a ‘beauty anti-quark’, which are then bound together,” he told BBC News.

“People have thought this more excited state should exist for years but nobody has managed to see it until now.

“It’s also interesting for what it tells us about the forces that hold the quark and the anti-quark together – the strong nuclear force. And that’s the same force that holds, for instance, the atomic nucleus together with its protons and the neutrons.”

The LHC is designed to fill in gaps in the Standard Model – the current framework devised to explain the interactions of sub-atomic particles – and also to look for any new physics beyond it.
In particular, it is using the collisions to try to pin down the famous Higgs particle – another boson that physicists hypothesize can explain why matter has mass.

Discoveries such as Chi-b (3P) are an important part of this quest because they add to the wider background knowledge, says Prof Jones.

“The better we understand the strong force, the more we understand a large part of the data that we see, which is quite often the background to the more exciting things we are looking for, like the Higgs.“So, it’s helping put together that basic understanding that we have and need to do the new physics.”

Source: BBC UK

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