Friday, December 2, 2011

Doubt Cast On Another Excess CP Violation In D Mesons

It is starting to look like a high sigma CP violation (relative to the Standard Model expectation) in the decay of mesons with charm quarks in them, call D mesons, at LHC is really a product of an insufficiently accurate QCD calculation that doesn't include high enough order terms in an infinite series approximation and just moderately higher than expected values within the range of normal statistical variation. It could be something if the theoretical expectation calculations aren't too far off, but there is a good chance that it isn't. The literature on the QCD expectation in inconsistent and prior collider experiments show a CP violation of a similar order of magnitude in a comparable experiment that is a bit lower than the one seen in this experiment (the older experiment has a bigger margin of error also consistent with zero).

Prior coverage of the results at this blog can be found here.

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