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How Many Neutrinos Does It Take to Screw Up Einstein?


Results from a second experiment uphold the observation that neutrinos are moving faster than the speed of light. The OPERA collaboration, which first reported the superluminal neutrinos in September, has rerun the experiment and detected 20 new neutrinos breaking Einstein’s theoretical limit.

The findings are heartening to anyone hoping to see a major physics revolution in their lifetime. But scientists, as ever, are being cautious, and it will take an independent replication of the results by another team to even begin convincing many of them.

“This eliminates one major class of systematic errors, and it’s impressive for the OPERA team to have mounted in a short period of time,” said physicist Robert Plunkett of Fermilab National Laboratory in Batavia, Illinois. “However, it doesn’t mean that there isn’t an error somewhere else in their system.”

Neutrinos are subatomic particles with hardly any mass that are able to fly through most matter as if it weren’t there. Despite their negligible mass, if they were somehow able to exceed the speed-of-light limit set by Einstein’s theory of special relativity, it would present a major head-scratcher to modern physicists.

The OPERA team’s detector at Gran Sasso National Laboratory in Italy had previously detected neutrinos produced in bunches at CERN arriving 60 nanoseconds earlier than light speed would allow. The tricky part is that these bunches took a good length of time to produce — much longer than 60 nanoseconds — so the researchers had to be careful with their analysis. If they thought a neutrino was coming from the start of the bunch when it was actually coming from the end, then that neutrino would not actually be moving faster than light.


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