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Study of hadronic transitions between Y states and observation of Y(4S) -> eta Y(1S) decay

Abstract:

We present a study of hadronic transitions between Υ(mS) (m=4, 3, 2) and Υ(nS) (n=2, 1) resonances based on 347.5fb-1 of data taken with the BABAR detector at the PEP-II storage rings. We report the first observation of Υ(4S)→ηΥ(1S) decay with a branching fraction B(Υ(4S)→ηΥ(1S))=(1.96±0.06stat±0.09syst) ×10-4 and measure the ratio of partial widths Γ(Υ(4S) →ηΥ(1S))/Γ(Υ(4S)→π+π-Υ(1S))=2. 41±0.40stat±0.12syst. We set 90% CL upper limits on the ratios Γ(Υ(2S)→ηΥ(1S))/Γ(Υ(2S)→π+π- Υ(1S))<5.2×...

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Publication status:
Published

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Publisher copy:
10.1103/PhysRevD.78.112002

Authors


Karyotakis, Y More by this author
Poireau, V More by this author
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Journal:
PHYSICAL REVIEW D
Volume:
78
Issue:
11
Publication date:
2008-12-05
DOI:
EISSN:
1550-2368
ISSN:
1550-7998
URN:
uuid:f5679bf1-e183-4863-b2f6-0bcb371e6c8e
Source identifiers:
211252
Local pid:
pubs:211252
Language:
English

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