Abstract
The first observation of the decay is reported. The study is based on a sample of proton-proton collisions corresponding to of integrated luminosity collected with the LHCb detector. The significance of the signal is 6.4 standard deviations. The branching fraction is measured to be , where the third uncertainty comes from the branching fraction that is used as a normalization. In addition, the charge asymmetries of and , which are control channels, are measured to be and , respectively. All results are consistent with theoretical expectations.
- Received 27 March 2015
DOI:https://doi.org/10.1103/PhysRevLett.115.051801
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© 2015 CERN, for the LHCb Collaboration