Credit and more details: http://arxiv.org/pdf/1211.1230v1.pdf

 

LHC team observes first instance of D-mesons oscillating between matter and antimatter

March 4, 2013 by Bob Yirka

(Phys.org) —Researchers working at the Large Hadron Collider (LHC) have observed for the first time evidence of D-mesons oscillating between matter and antimatter. They describe their work, observations and the degree of certainty they’ve given their findings in their paper they’ve uploaded to the preprint server arXiv, which has subsequently been accepted for publication in Physical Review Letters.

Put simply, antimatter is identical to matter except that it exists with an opposite electrical charge. In this new research, the team was studying mesons—a group that along with other particles are made up of quarks. Mesons are made up of just two quarks, one matter, the other antimatter. Research over the years has led to theories that the quarks that exist as part of mesons, can oscillate between matter and antimatter. More recently, three (K-mesons and two types of B-mesons) out of the four known types of mesons had been shown to do just that, leaving just the D-meson. Now, with this new effort, researches at the LHC say their experiments have shown such oscillations exist for them as well. And so strong are the results that the team has given them a five sigma level of certainty.

Read more: LHC team observes first instance of D-mesons oscillating between matter and antimatter — phys.org.

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