Abstract
We present a measurement of form-factor-independent angular observables in the decay . The analysis is based on a data sample corresponding to an integrated luminosity of , collected by the LHCb experiment in collisions at a center-of-mass energy of 7 TeV. Four observables are measured in six bins of the dimuon invariant mass squared in the range . Agreement with recent theoretical predictions of the standard model is found for 23 of the 24 measurements. A local discrepancy, corresponding to 3.7 Gaussian standard deviations is observed in one bin for one of the observables. Considering the 24 measurements as independent, the probability to observe such a discrepancy, or larger, in one is 0.5%.
- Received 9 August 2013
DOI:https://doi.org/10.1103/PhysRevLett.111.191801
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© 2013 CERN, for the LHCb collaboration