After a more careful reading of the paper, the listening to a seminar on the result, and some discussions, I can share with you a few more details on the Opera measurement.

UPDATE: some technical considerations on the measurement are available in a followup post I wrote after attending a seminar on the new result today. In particular, one startling consideration emerges - if the reading of the 20 MHz Opera clock were off by just one tick, the result would be compatible with v=c.

UPDATE: you can download the new Opera paper at this link. You will need to use the username and password "neuvel".

It's been a while since my last "guess the plot" posting. The simple explanation is that I did not happen to run into any fancy graph in the last month or so. Now, today I have one for you to guess, but I must add that I believe it is rather easy to understand what it represents. Less obvious is to completely understand the math behind it, and the implications of the construction.

Today I wish to briefly discuss a recent important measurement produced by the LHCb collaboration, a measurement of CP violation in the decay of charmed mesons. Before I do, I think I need to explain some details of the LHCb experimental arrangement, because it is different from what most readers here are familiar with.

And, update: rather than putting it at the end, I prefer to link Resonaances' post on the same subject here this time - he wrote about the matter yesterday and did a much better job than I do below. Sorry for noticing it after posting mine!

Some pedestrian kinematics