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

Abstract:
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.

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Authors


Wilkinson, G More by this author
Ecklund, KM More by this author
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Journal:
Physical Review Letters
Volume:
101
Issue:
18
Publication date:
2008-10-30
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
URN:
uuid:9fb2744e-d3c1-4e05-b457-575570e56ed4
Source identifiers:
161038
Local pid:
pubs:161038
Language:
English

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