“We also know that the total effects induced by Standard Model CP violation are too small to account for the matter-dominated Universe,” Dr Campana said. More recently, experiments at the so-called B factories and the LHCb experiment at CERN have found that the B + meson also demonstrates CP violation.Īll of these CP violation phenomena can be accounted for in the Standard Model, although some interesting discrepancies demand more detailed studies. About 40 years later, experiments in Japan and the US found similar behavior in another particle, the B 0 meson. Violation of the CP symmetry was first observed at Brookhaven Laboratory in the US in the 1960s in neutral particles called kaons. “Experiments elsewhere have not been in a position to accumulate a large enough number of B 0 s decays.” The results appear in a paper submitted for publication in Physical Review Letters ( version). “The discovery of the asymmetric behavior in the B 0 s particle comes with a significance of more than 5 sigma – a result that was only possible thanks to the large amount of data provided by the LHC and to the LHCb detector’s particle identification capabilities,” explained Dr Pierluigi Campana, spokesperson of the LHCb. Now the LHCb experiment has observed a preference for matter over antimatter known as CP-violation in the decay of neutral B 0 s particles. By studying subtle differences in the behavior of particle and antiparticles, experiments at the Large Hadron Collider (LHC) are seeking to cast light on this dominance of matter over antimatter. Matter and antimatter are thought to have existed in equal amounts at the beginning of the Universe, but today the Universe appears to be composed essentially of matter. The decay into a negative K meson red track and a positive π green track is show here (LHCb experiment) The B0 and B0s meson decays into K and π mesons were studied by CERN scientists.
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