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/ψ γ decay is measured to be B(X(3872) → ψ(2S) γ)/B(X(3872) → J/ψ γ) = 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 anti-D* molecular interpretation of the X(3872) state.

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. (2014). Evidence for the Decay X(3872) → ψ(2S) γ. NUCLEAR PHYSICS. B, 886(1), 665-680 [10.1016/j.nuclphysb.2014.06.011].

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

CARBONE, ANGELO;GALLI, DOMENICO;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2014

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/ψ γ decay is measured to be B(X(3872) → ψ(2S) γ)/B(X(3872) → J/ψ γ) = 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 anti-D* molecular interpretation of the X(3872) state.
2014
R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. (2014). Evidence for the Decay X(3872) → ψ(2S) γ. NUCLEAR PHYSICS. B, 886(1), 665-680 [10.1016/j.nuclphysb.2014.06.011].
R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A.A. Alves...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/320113
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