Measurement of the η′-meson mass using J/ ψ→γη′

Journal article

We measure the mass of the η′ meson using ψ(2S) →π+π-J/ψ, J/ψ→γη′ events acquired with the CLEO-c detector operating at the CESR e+e- collider. Using three decay modes, η′→ρ0γ, η′→π+π-η with η→γγ, and η′→π+π-η with η→π+π-π0, we find Mη′=957.793±0.054±0. 036MeV, in which the uncertainties are statistical and systematic, respectively. This result is consistent with but substantially more precise than the current world average. © 2008 The American Physical Society.

Authors: Libby, J; Martin, L; Powell, A; Wilkinson, G; Ecklund, K

• Journal: Physical Review Letters
• Volume: 101
• Issue: 18
• Publication date: 2008-10-30
• DOI: 10.1103/PhysRevLett.101.182002
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English