As usual, the interpretation is still unclear, but I think it is an interesting effect.(adsbygoogle = window.adsbygoogle || []).push({});

LHCb studied the angular distributions in the decay ##B^0 \to K* \mu \mu## and presented the result at EPS2013. In one variable (called P'_{5}) in two bins, a large deviation was found (3.7 sigma in one bin).

As many variables and bins were studied, the probability of a random fluctuation is larger than this significance suggests - LHCb gives the total probability as .5% (2.8 sigma).

The analysis was based on 2011 data only, 2012 data will increase the statistics by more than a factor of 3.

LHCb talk

Theory interpretation (based on LHCb results)

phys.org news

My guess: theory error (as with ##\Delta A_{CP}##), or maybe a statistical fluctuation, or some measurement error. With the full LHCb dataset (and CMS, if they can measure it as well), the measurement will become much cleaner.

New physics would be the most amazing explanation, of course.

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# Deviation from Standard Model observed at LHCb (B->K* mu mu)

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