![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhKMPvx-CvVhqk7Y3CHwugf37p2XDRtdrsckitfsfgjeUzi5Z1_vIBt7G9FRLXNfSN8GVEU8Y00RMYXsrAze-3HITzau3Fl41_fyLIyzcgNLC0aPglcXCzt1ZBn-763bh-zflu8i4Z9pUc/s500/20130809-P5prime.png)
According to Joaquim Matias from Universitat Autonoma de Barcelona and colleagues the deviation in $P_5'$ and small discrepancies in the other angular observables for this decay, follow a pattern. In a recent paper the authors claim that a global analysis of the LHCb data, together with previous measurements, show a deviation of $4.5 \sigma$ with respect to Standard Model expectations, which can be explained with the same mechanism. This demands further investigation, in particular to re-evaluate all the sources of theoretical uncertainty, and to understand the effects of correlations between the experimental measurements.(via LHCb)
The image shows the distribution of the $P_5'$ observable as a function of the $\mu^+ \mu^-$ invariant mass squared $q^2$. The black data points are compared with the Standard Model prediction.
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