Theory news

Possible hints of New Physics found in a new joint analysis of data from LHCb and other experiments

• Global analysis of observables related to rare B decays measured in different experiments such as LHCb, Belle and preliminary results from ATLAS and CMS shows a discrepancy with the Standard Model at five standard deviations.

• Some analyzed observables are designed to test an important property of the Standard model called lepton-flavor universality. The discrepancy found in the analysis challenges this universality.

• The discrepancy between the results and the Standard Model predictions points to possible New Physics. Two possible model candidates include the existence of a new fundamental particle such as a Z' or a leptoquark.

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New experimental results on the universal lepton flavour observable Q5

At the CKM 2016 conference in MUMBAI the Belle experiment has announced the first simultaneous measurement of P5'muon and P5'e, the two components of the universal lepton flavour observable Q5 proposed in May of this year in JHEP 1610 (2016) 075.

The results show a deviation with respect to the SM predictions that is not yet statistically significant (2.6 sigma for muons and 1.1 sigma for electrons) but coherent with other measurements of the muonic channel and with other observables pointing to the same type of asymmetry between muons and electrons.

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