The latest OPERA results are in and they are very interesting. They used extremely tight bunches of protons this time, with a pulse width of only a few nanoseconds:
These bunches allowed the team to correlate individual neutrino events with the bunches that originated them. This is what they saw:
Numerically, the result is 62.1 ± 3.7 ns, consistent with their previously claimed result.
In my view, there are four possible categories of things that could have gone wrong with the OPERA experiment:
- Incorrectly synchronized clocks;
- Incorrectly measured distance;
- Unaccounted-for delays in the apparatus;
Because this new result does not rely on the statistical averaging of a large number of events, item 4 is basically out. One down, three to go.