Evidence for the decay X(3872) -> psi(2S)gamma
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Publication date
September 2014
DOI Publisher
Elsevier BV Journal
Nuclear Physics BAbstract
Evidence for the decay mode X(3872)→ψ(2S)γ in B +→X(3872)K + decays is found with a significance of 4.4 standard deviations. The analysis is based on a data sample of proton-proton collisions, corresponding to an integrated luminosity of 3 fb-1, collected with the LHCb detector, at centre-of-mass energies of 7 and 8 TeV. The ratio of the branching fraction of the X(3872)→ψ(2S)γ decay to that of the X(3872)→J/ψγ decay is measured to beB(X(3872)→ψ(2S)γ)B(X(3872)→J/ψγ)=2.46±0.64±0.29, where the first uncertainty is statistical and the second is systematic. The measured value does not support a pure DD-* molecular interpretation of the X(3872) state. © 2014 CERN for the benefit of the LHCb Collaboration
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