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Observation of Upsilon(2S)-->etaUpsilon(1S) and search for related transitions.

Abstract:

We report the first observation of Upsilon(2S)-->etaUpsilon(1S), with a branching fraction B=(2.1(-0.6)+0.7(stat)+/-0.3(syst)) x 10(-4) and a statistical significance 5.3sigma. Data were acquired with the CLEO III detector at the CESR e+e(-) symmetric collider. This is the first process observed involving a b-quark spin flip. For related transitions, 90% confidence limits in units of 10(-4) are B(Upsilon(2S)-->pi0Upsilon(1S)) < 1.8, B(Upsilon(3S)-->etaUpsilon(1S)) < 1.8, B(Upsi...

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Publication status:
Published

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Journal:
Physical review letters
Volume:
101
Issue:
19
Pages:
192001
Publication date:
2008-11-05
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
URN:
uuid:8cf2b58f-4c46-44af-b9cd-0fa35161eab2
Source identifiers:
7477
Local pid:
pubs:7477
Language:
English
Keywords:

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