New Constraints on Neutrino Velocities

Abstract

The OPERA collaboration has claimed that muon neutrinos with mean energy of 17.5 GeV travel 730 km from CERN to the Gran Sasso at a speed exceeding that of light by about 7.5 km/s or 25 ppm. However, we show that such superluminal neutrinos would lose energy rapidly via the bremsstrahlung of electron-positron pairs ($\nu \to \nu +e^{-}+e^{+}$). For the claimed superluminal neutrino velocity and at the stated mean neutrino energy, we find that most of the neutrinos would have suffered several pair emissions en route, causing the beam to be depleted of higher energy neutrinos. Thus we refute the superluminal interpretation of the OPERA result. Furthermore, we appeal to Super-Kamiokande and IceCube data to establish strong new limits on the superluminal propagation of high-energy neutrinos.

5 pages

References in corpus (3)

• Measurement of the neutrino velocity with the OPERA detector in the CNGS beam
• Measurement of neutrino velocity with the MINOS detectors and NuMI neutrino beam
• Study of TeV Neutrinos with Upward Showering Muons in Super-Kamiokande

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