PetTastic wrote:To me, their GPS accuracy looks ok.
The particles arrived 60ns early that is about 18 metres at he speed of light.
Also from the video and reading their papers / presentations the clock setup looks good as well.
Google calc "60 nanoseconds * the speed of light = 17.9875475"
Those weird faster-than-light neutrinos that CERN thought they saw last month may have just gotten slowed down to a speed that'll keep them from completely destroying physics as we know it. In an ironic twist, the very theory that these neutrinos would have disproved may explain exactly what happened...
Researchers at the University of Groningen in the Netherlands went and crunched the numbers on how much relativity should have effected the experiment, and found that the correct compensation should be about 32 additional nanoseconds on each end, which neatly takes care of the 60 nanosecond speed boost that the neutrinos originally seemed to have. This all has to be peer-reviewed and confirmed, of course, but at least for now, it seems like the theory of relativity is not only safe, but confirmed once again.
The neutrinos showed up 60 nanoseconds (60 billionths of a second) earlier than light would have over the same distance.
However, the time measurement is not direct; the researchers cannot know how long it took an individual neutrino to travel from Switzerland to Italy.
Cern's director of research (Sergio Bertolucci) says the new experimental design will be more efficient.
Instead, the measurement must be performed statistically: the scientists superimpose the neutrinos' "arrival times" on the protons' "departure times", over and over again and taking an average.
But some physicists say that any wrong assumptions made when relating these data sets could produce a misleading result.
M Paul Lloyd wrote:I think that's pretty much what Ezbloke is driving at Mr.S, the idea that the motion of the Earth, as it rotates around its own axis, the Sun and the galactic centre may have combined to throw the calculations out of kilter.
But even so this would not solve the problem completely because relativity should kick in and impose a blanket limit, so that to any observer the object (neutrino) should not appear to exceed it maximum velocity.
So if the hypothetical train were travelling at light speed and you threw that ball along the corridor in the direction that train was travelling it would be forced to stand still relative to the train and if you threw it in the opposite direction its apparent velocity should still not exceed that of light.
Neutrino experiment repeat at Cern finds same result
By Jason Palmer Science and technology reporter, BBC News
The team which found that neutrinos may travel faster than light has carried out an improved version of their experiment - and confirmed the result.
If confirmed by other experiments, the find could undermine one of the basic principles of modern physics.
Critics of the first report in September had said that the long bunches of neutrinos (tiny particles) used could introduce an error into the test.
The new work used much shorter bunches.
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