Last Nail in the Coffin for Superluminal Neutrinos

The ICARUS Experiment, operating at the same Gran Sasso location as the OPERA Experiment, has conducted its own measurement of the speed of neutrinos from CERN, and the results are consistent with the neutrino velocity between constrained by the speed of light. (Since neutrinos are known to have a slight mass, they would actually travel slightly below lightspeed, but the difference is small enough to be buried in the noise of the results.)

Read it and weep:

From the ICARUS paper.

It doesn’t end there. Other teams, including BOREXINO, LVD, and OPERA (now that they have identified possible sources of systemic error) will also be performing measurements. But it is looking like the “Ghost of OPERA” doesn’t have a ghost of a chance. So long ftl neutrinos.

My previous articles on this topic:

Update: (April 2, 2012)

The Fat Lady has sung for FTL neutrinos. Matt Strassler has posted an excellent post-mortem of the situation based upon the limited available information.

Final Update (for reals, this time): June 8, 2012

At the Neutrino 2012 conference in Kyoto, it has been announced that all four major neutrino experiments at the Gran Sasso facility (OPERA, LVD, ICARUS, and Borexino) have performed new neutrino speed measurements and have found no evidence of superluminal neutrinos. Special Relativity still stands. Matt Strassler has a brief writeup on it here. These results are consistent with neutrino speed measurements also reported at the conference by the MINOS experiment.


About Glen Mark Martin

MCSE-Messaging. Exchange Administrator at the University of Texas at Austin. Unrepentant armchair physicist.
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2 Responses to Last Nail in the Coffin for Superluminal Neutrinos

  1. Pingback: “We are completely compatible with the speed of light that we learn at school” « Slugger O'Toole

  2. Pingback: Higgs: What’s In A Name? | Whiskey…Tango…Foxtrot?

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