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Observation of η′ decays to π+π-π0 and π+π-e+e-

Abstract:

Using ψ(2S)→π+π-J/ψ, J/ψ→γη′ events acquired with the CLEO-c detector at the CESR e+e- collider, we make the first observations of the decays η′→π+π-π0 and η′→π+π-e+e-, measuring absolute branching fractions (37-9+11±4)×10-4 and (25-9+12±5)×10-4, respectively. For η′→π+π-π0, this result probes the mechanism of isospin violation and the roles of π0/η/η′-mixing and final state rescattering in strong decays. We also set upper limits on branching fractions for η′ decays to π+π-μ+μ-, 2(π+π-), π+π-...

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Journal:
Physical Review Letters More from this journal
Volume:
102
Issue:
6
Publication date:
2009-02-11
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
Language:
English
Pubs id:
pubs:161143
UUID:
uuid:f529c278-a32d-4c07-b6a7-78cdd370b65e
Local pid:
pubs:161143
Source identifiers:
161143
Deposit date:
2013-11-16

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