Observation of ψ(3770)γχc1γγJ/ψ

T. E. Coan et al. (CLEO Collaboration)
Phys. Rev. Lett. 96, 182002 – Published 10 May 2006

Abstract

From e+e collision data acquired with the CLEO detector at the Cornell Electron Storage Ring, we observe the non-DD¯ decay ψ(3770)γχc1 with a statistical significance of 6.6 standard deviations, using the two-photon cascades to J/ψ and J/ψ+. We determine σ(e+eψ(3770))×B(ψ(3770)γχc1)=(18.0±3.3±2.5)pb and branching fraction B(ψ(3770)γχc1)=(2.8±0.5±0.4)×103. We set 90% C.L. upper limits for the transition to χc2 (χc0): σ×B<5.7pb (<282pb) and B<0.9×103 (<44×103). We also determine Γ(ψ(3770)γχc1)/Γ(ψ(3770)π+πJ/ψ)=1.5±0.3±0.3 (>1.0 at 90% C.L.), which bears upon the interpretation of X(3872).

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  • Received 21 September 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.182002

©2006 American Physical Society

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Vol. 96, Iss. 18 — 12 May 2006

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