A paper by another team at Gran Sasso, ICARUS, contradicts the OPERA neutrino results by measuring the energy spectrum of the supposedly speeding neutrinos and finds that they could not have traveled faster than light.
[T]he ICARUS scientists say, the neutrino beam as tested in their equipment registered an energy spectrum fully corresponding with what it should be for particles travelling at the speed of light and no more.
Physicist Tomasso Dorigo, who works at CERN, the European Organisation for Nuclear Research, and the US Fermilab near Chicago, said in a post on the website Scientific Blogging that the ICARUS paper was “very simple and definitive.”
It says, he wrote, “that the difference between the speed of neutrinos and the speed of light cannot be as large as that seen by OPERA, and is certainly smaller than that by three orders of magnitude, and compatible with zero.”
So something else is causing the differential, otherwise those neutrinos would have been far more energetic. What do you figure it is? I’m still liking the idea of the neutrinos being emitted some distance (e.g. 18m away) from the source. That, or some niggling little miscalibration that nobody’s managed to hit upon yet. A few ideas for testing this again, off the top of my head — build a detector halfway between the start and endpoints and see if the 60ns difference is halved — if not, then it’s a measurement problem, or my new pet hypothesis. Or maybe try some other particles at known speeds and see if the detector gets them too early. Or see if we can produce neutrinos using higher-energy methods and see if the speed differential stays the same. We should definitely find some way to measure where the neutrinos are being emitted from, too.
Perhaps my physics-knowledgeable readers might have some commentary on my suggestions, and how utterly dumb they are for some reason that I in my lay status am completely unaware?
Hat tip to reader Bruce Gorton.