Scepticism over faster-than-light particle
Geneva - The heads of three major physics labs said they're sceptical a subatomic particle travelled faster than the speed of light.
The three lab directors spoke two weeks after European scientists said they clocked a neutrino going faster than the 299 792.458km/s - thought to be nature's speed limit under Einstein's 1905 special theory of relativity.
The European Organisation for Nuclear Research, or Cern, on the Swiss-French border, provided the particle accelerator that sent neutrinos on their 730km trip underground from Geneva to Italy.
There's a good chance the research won't hold up, said Rolf Heuer of Cern, Pier Oddone of Fermi National Accelerator Laboratory, or Fermilab, in the US, and Atsuto Suzuki of High Energy Accelerator Research Organisation, or KEK, in Japan.
"I'm a complete sceptic," Oddone said.
Suzuki said he also is "expecting" it to turn out to be untrue, while Heuer agreed "one has to be very, very sceptical" until someone else can confirm the findings.
Cern reported that a neutrino beam fired from a particle accelerator near Geneva to a lab in Italy travelled 60 nanoseconds faster than the speed of light. The margin of error was 10 nanoseconds, each of which is equal to one-billionth of a second.
France's National Institute for Nuclear and Particle Physics Research collaborated with Italy's Gran Sasso National Laboratory on the neutrino experiment at Cern.
The lab directors said there were four possibilities for trying to do that in the US, Japan, Italy and the world's biggest physics lab on the Swiss-French border.
Oddone said Fermilab hoped to accomplish it by next May.
If the work can be replicated, they said, scientists would have to fundamentally alter their explanations of how the universe operates.
That's because much of our understanding is based on Einstein's theory that energy equals mass times the speed of light squared. Already, they agreed, the world seems to be moving beyond it in ways once thought unimaginable.
"Well, who tells you we are only living in three space dimensions? Maybe our imagination is not good enough," said Heuer. "If we find an extra dimension, or a number of extra dimensions, that could bring us much further beyond Einstein.
Oddone said that "in some sense we have moved already beyond Einstein" in our understanding of the universe.
"It's still Einstein's dream of getting to a unified picture of nature," Oddone said. "We really don't know what's out there. And that's why it's so exciting."