Now my amateur hypothesis. We know the speed of light decreases in greater mass densities. That’s why there’s Cerenkov radiation. Beta particles underwater are emitted with enough energy to exceed the speed of light in that medium. With sufficient energy they would emit Cerenkov in air.
But electrons have several mechanisms to shed energy. But apart from being absorbed, I’m unaware of any other neutrino interaction.
So suppose neutrinos propagate at the speed of light in a pure vacuum? Or at least very very very close to c-speed? If I had the math, I’d calculate whether that 60 nanoseconds FTL flight corresponds to the difference in lightspeed between travelling through the intervening medium and passing through a perfect vacuum.
What do you think? Is it at least plausible enough to email a revelent expert?