A few weeks ago, I noted that physicists Andrew Cohen and Sheldon Glashow had submitted a paper suggesting the the OPERA results probably did not indicate neutrinos travelling faster than the speed of light. That’s because the OPERA detector did not show any signs that the neutrinos had lost substantial amounts of energy, which would be the expectation if they were truly superluminal, because the speeds would cause them to radiate electron-positron pairs.
Now, scientists at the ICARUS Detector, which is also located in Italy and also receives neutrinos from CERN, have submitted a paper confirming that the neutrinos detected there also do not exhibit the radiation expected at faster-than-light velocities. However, while the Cohen/Glashow paper was based primarily on a mathematical calculation of the energies, the scientists at ICARUS confirmed that there was no energy loss. Moreover, the ICARUS detector is capable of detecting the electron-positron decay pairs that should result from faster-than-light neutrinos, and found no sign of them.
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