Scientists have found neutrinos that seem to be traveling faster than the speed of light, which, according to the laws of physics since Einstein, is supposed to be impossible:
Puzzling results from Cern, home of the LHC, have confounded physicists – because it appears subatomic particles have exceeded the speed of light.
Neutrinos sent through the ground from Cern toward the Gran Sasso laboratory 732km away seemed to show up a tiny fraction of a second early.
The result – which threatens to upend a century of physics – will be put online for scrutiny by other scientists.
In the meantime, the group says it is being very cautious about its claims.
“We tried to find all possible explanations for this,” said report author Antonio Ereditato of the Opera collaboration.
“We wanted to find a mistake – trivial mistakes, more complicated mistakes, or nasty effects – and we didn’t,” he told BBC News.
“When you don’t find anything, then you say ‘Well, now I’m forced to go out and ask the community to scrutinise this.’”
The speed of light is the Universe’s ultimate speed limit, and much of modern physics – as laid out in part by Albert Einstein in his special theory of relativity – depends on the idea that nothing can exceed it.
Thousands of experiments have been undertaken to measure it ever more precisely, and no result has ever spotted a particle breaking the limit.
But Dr Ereditato and his colleagues have been carrying out an experiment for the last three years that seems to suggest neutrinos have done just that.
Neutrinos come in a number of types, and have recently been seen to switch spontaneously from one type to another.
The team prepares a beam of just one type, muon neutrinos, sending them from Cern to an underground laboratory at Gran Sasso in Italy to see how many show up as a different type, tau neutrinos.
In the course of doing the experiments, the researchers noticed that the particles showed up a few billionths of a second sooner than light would over the same distance.
The team measured the travel times of neutrino bunches some 15,000 times, and have reached a level of statistical significance that in scientific circles would count as a formal discovery.
But the group understands that what are known as “systematic errors” could easily make an erroneous result look like a breaking of the ultimate speed limit, and that has motivated them to publish their measurements.
“My dream would be that another, independent experiment finds the same thing – then I would be relieved,” Dr Ereditato said.
But for now, he explained, “we are not claiming things, we want just to be helped by the community in understanding our crazy result – because it is crazy”.
“And of course the consequences can be very serious.”
I know exactly what our readers Webmonk and tODD will say: The journalists have it all wrong and this is not that big a deal. Surely a mistake, something that has another explanation. (I know: Maybe the neutrinos have just jumped into the future.) Fine, fine. I hope they will give us their explanation. I hope they and other of you science types will allow for a mental experiment and instruct us about what difference this would make if it were, in fact, true that some things can go faster than light.