Jiansen Lu
New Progress in Particle Physics
November 20th 2011 18:59
In last week (November 13-18, 2011), two exciting news in particle physics are announced. One is D-meson CP vilation, another is confirmation of faster than light neutrino.
On Monday HCP meeting in Paris, LHCb physicist Matthew Charles showed that D-meson decays slightly differently from their antiparticles with 3.5 sigma
significance. The result contradicts the Standard Model in physics, who suggests that the D-meson decays almost the same as its antiparticles. The result may hint some interesting new physics in front of us.
Light is no more fastest
After the first announcement of evidently faster-than-light neutrinos, there are a lot of critics about experimental error of the data for long bunches of neutrinos. Opera team improved their experiment results using much shorter bunches. They confirmed the same result. The foundation stone of physics that nothing can exceed the speed of light in a vacuum is challenged.
Video: Was Einstein Wrong? Faster Than Light Neutrinos
Now, instead of firing long blobs of neutrinos in the first experiment, CERN have been firing short pulses, just three billionths of second long. They come up with the same answer - the neutrinos appear to be traveling a bit faster than the speed of light.
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