Einstein was right, neutrino researchers admit

TOKYO — Scientists on Friday said that an experiment which challenged Einstein’s theory on the speed of light had been flawed and that sub-atomic particles—like everything else—are indeed bound by the universe’s speed limit.

Researchers working at the European Centre for Nuclear Research (CERN) caused a storm last year when they published experimental results showing that neutrinos could out-pace light by some six kilometers (3.7 miles) per second.


The neutrinos were timed on the journey from CERN’s giant underground lab near Geneva to the Gran Sasso Laboratory in Italy, after travelling 732 kilometers (454 miles) through the Earth’s crust.

To do the trip, the neutrinos should have taken 0.0024 seconds. Instead, the particles were recorded as hitting the detectors in Italy 0.00000006 seconds sooner than expected, the preliminary experiment had shown.


The findings threatened to upend modern physics and smash a hole in Albert Einstein’s 1905 theory of special relativity, which described the velocity of light as the maximum speed in the cosmos.

But CERN now says that the earlier results were wrong and faulty kit was to blame.

“Although this result isn’t as exciting as some would have liked, it is what we all expected deep down,” said the centre’s research director Sergio Bertolucci.

The initial findings had been greeted with a combination of excitement and scepticism, even from those involved in the experiment, urging other physicists to carry out their own checks.

“If this result at CERN is proved to be right, and particles are found to travel faster than the speed of light, then I am prepared to eat my shorts, live on TV,” Jim Al-Khalili, a professor of theoretical physics at Britain’s University of Surrey, declared at the time.

© 2012 AFP