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Faster-than-light neutrinos: Hey, not so fast

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In “Finding puts brakes on faster-than-light neutrinos” (Nature, October 20, 2011), Eugenie Samuel Reich reports, “An independent experiment confirms that subatomic particles have wrong energy spectrum for superluminal travel.”:

On 17 October, the Imaging Cosmic and Rare Underground Signals (ICARUS) collaboration submitted a paper1 to the preprint server arXiv.org, in which it offered a rebuttal of claims2 to have clocked subatomic particles called neutrinos travelling faster than the speed of light.

Instead, it has shown that the energy spectrum of the neutrinos does not exhibit an effect predicted last month3 by Andrew Cohen and Sheldon Glashow, theoretical physicists at Boston University in Massachusetts.

If the Cohen–Glashow effect is a valid prediction, “neutrinos are not superluminal,” says Sandro Centro, a physicist at the University of Padua in Italy, deputy spokesman for ICARUS and a co-author of the latest paper.

Stay tuned. After all, it’s hard on the heels of “After big faster-than-light neutrino meet: “For the moment, there is no explanation that works”

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