Measurements of arrival times of photons and neutrinos from supernova SNa in provided a much better agreement with the speed of light, but those neutrinos were of a much lower energy. The possibility remains that velocity depends on energy. Undoubtedly, many more possible explanations will arise if all conventional sources of error are excluded. The much more likely scenario is that the analysis has overlooked some seemingly insignificant but critical aspect, and that re-analysis will led to a very good agreement with the speed of light.
Portsmouth Climate Festival — Portsmouth, Portsmouth. Edition: Available editions United Kingdom. Become an author Sign up as a reader Sign in. OPERA defended its announcement, saying that it could find no flaw in its measurement. Now another experiment located just a few metres from OPERA has clocked neutrinos travelling at roughly the speed of light, and no faster.
The neutrinos were packed into pulses just 3 nanoseconds long. That meant that the timing could be measured far more accurately than the original OPERA measurement, which used microsecond pulses. Neutrinos measured by the experiment arrived within just 4 nanoseconds of the time that light travelling through a vacuum would take to cover the distance, well within the experimental margin of error. The findings are yet another blow to OPERA, which was already under intense scrutiny from the wider experimental community.
Almost as soon as the announcement was made, physicists began trying to poke holes in the OPERA analysis, and on 23 February researchers from within the OPERA team announced that they had uncovered possible timing problems with their original measurements see ' Timing glitches dog neutrino claim '.
Those problems could have led to the nanosecond discrepancy. The team continues to search for possible sources of error, he says. For some, the new measurements settle the matter once and for all. But as it stands, he suspects he will be toasting Einstein. An earlier version of this story incorrectly stated that the neutrino pulses sent in late October and early November last year were approximately 4 nanoseconds long, rather than 3 nanoseconds.
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