Evidence for the decay X(3872) →ψ(2S)γ
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Publication date
2014-09Abstract
Evidence for the decay mode X(3872) →ψ(2S)γ in B+→X(3872)K+decays is found with a sig-nificance 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 7and 8 TeV. The ratio of the branching fraction of the X(3872) →ψ(2S)γ decay to that of the X(3872) →J/ψγdecay is measured to be B(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 D ̄D∗molecular interpretation of the X(3872) state.
Document Type
Article
Published version
Language
English
Subject (CDU)
539 - Physical nature of matter
Keywords
Pages
16 p.
Publisher
Elsevier
Is part of
Nuclear Physics B, 2014, Vol. 886
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© CERN
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by/4.0/