New Physics at LHC? An Anomaly in CP Violation

Here in the Era of 3-Sigma Results, we tend to get excited about hints of new physics that eventually end up going away. That's okay -- excitement is cheap, and eventually one of these results is going to stick and end up changing physics in a dramatic way. Remember that "3 sigma" is the minimum standard required for physicists to take a new result at all seriously; if you want to get really excited, you should wait for 5 sigma significance. What we have here is a 3.5 sigma result, indicating CP violation in the decay of D mesons. Not quite as exciting as superluminal neutrinos, but if it holds up it's big stuff. You can read about it at Résonaances or Quantum Diaries, or look at the talk recently given at the Hadronic Collider Physics Symposium 2011 in Paris. Here's my attempt an an explanation. The latest hint of ...