Evidence for the decay X(3872) -> psi(2S)gamma

Journal article

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.

Authors: Aaij, R; Adeva, B; Adinolfi, M; Affolder, A; Ajaltouni, Z

• Publication status: Published
• Publisher: Elsevier
• Journal: NUCLEAR PHYSICS B
• Volume: 886
• Pages: 665-680
• Publication date: 2014-09-01
• DOI: 10.1016/j.nuclphysb.2014.06.011
• ISSN: 0550-3213
• Language: English