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Monday, April 14, 2014

Discovery of 4 Quark Hadron

The Daily Mail reports on the discovery of an exotic hadron particle. The particle was first detected in 2007, but only just now confirmed by scientists at the Large Hadron Collider. From the article:

The finding confirms the discovery of a so-called ‘exotic hadron.’
 
This classification remained virtually unchallenged until 2007, when an international team of 400 physicists and engineers, known as the Belle Collaboration, discovered an exotic particle called Z(4430), which appeared to have two quarks and two anti-quarks. 
The discovery of a particle made essentially of four quarks does not fit with our current model of physics. 
Until now the discovery of Z(4430) in 2007 was highly controversial, with physicists divided on whether it could exist or not. 
The recent confirmation of the particle using the LHCb proves beyond any reasonable doubt that it exists. 
‘We've confirmed the unambiguous observation of a very exotic state—something that looks like a particle composed of two quarks and two anti-quarks,’ says Tomasz Skwarnicki, a specialist in experimental high-energy physics and one of the lead authors on the new paper detailing the discovery. 
‘The discovery certainly doesn't fit the traditional quark model. 
‘It may give us a new way of looking at strong-interaction physics.’

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