Abstract
The interference between the -wave and -wave amplitudes in decays with the pairs in the region around the resonance is used to determine the variation of the difference of the strong phase between these amplitudes as a function of invariant mass. Combined with the results from our asymmetry measurement in decays, we conclude that the mass eigenstate that is almost is lighter and decays faster than the mass eigenstate that is almost . This determines the sign of the decay width difference to be positive. Our result also resolves the ambiguity in the past measurements of the violating phase to be close to zero rather than . These conclusions are in agreement with the standard model expectations.
- Received 22 February 2012
DOI:https://doi.org/10.1103/PhysRevLett.108.241801
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© 2012 CERN, for the LHCb Collaboration