Evidence for the decay X(3872) →ψ(2S)γ

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2014_nuclearphysicsb_lhcbcollab_evidence.pdf (421.94 KB)
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URI: http://hdl.handle.net/10347/21717
ISSN: 0550-3213
E-ISSN: 1873-1562
DOI: 10.1016/j.nuclphysb.2014.06.011

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2014

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Elsevier
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Evidence for the decay mode X(3872) →ψ(2S)γin B+→X(3872)K+decays is found with a sig-nificance of 4.4 standard deviations. The analysis is based on adata sample of proton–proton collisions, corresponding to an integrated luminosity of3fb−1, collected with the LHCb detector, at centre-of-mass energies of 7and8TeV. The ratio of the branching fraction of the X(3872) →ψ(2S)γdecay 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 apureD¯ D∗molecular interpretation of the X(3872)state.

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Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Albrecht, J., ... & Cartelle, P. A. (2014). Evidence for the decay X (3872)→ ψ (2S) γ. Nuclear Physics B, 886, 665-680

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©2014 CERN for the benefit of the LHCb Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/). Funded by SCOAP3

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