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Evidence for the decay X(3872)→ψ(2S)γ
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LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte and Whitehead, M. (Mark)). (2014) Evidence for the decay X(3872)→ψ(2S)γ. Nuclear Physics B - Proceedings Supplements, Volume 886 . pp. 665-680. doi:10.1016/j.nuclphysb.2014.06.011
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Official URL: http://dx.doi.org/10.1016/j.nuclphysb.2014.06.011
Abstract
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 be
where the first uncertainty is statistical and the second is systematic. The measured value does not support a pure molecular interpretation of the X(3872) state.
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