Abstract
The first observation of the decay is presented with a data sample corresponding to an integrated luminosity of of collisions at a center-of-mass energy of 7 TeV collected with the LHCb detector. The branching fraction is measured to be , where the first uncertainty is statistical and the second is systematic. An amplitude analysis of the final state in the decay is performed to separate resonant and nonresonant contributions in the spectrum. Evidence of the resonance is reported with statistical significance of 3.9 standard deviations. The corresponding product branching fraction is measured to be , yielding an upper limit of at 90% confidence level. No evidence of the resonant decay is found, and an upper limit on its branching fraction is set to be at 90% confidence level.
9 More- Received 27 August 2013
DOI:https://doi.org/10.1103/PhysRevD.88.072005
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© 2013 CERN, for the LHCb collaboration