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Observation of Υ(4S) Decays to π+π-Υ(1S) and π+π-Υ(2S)

Aubert, B. et al. (2006) Observation of Υ(4S) Decays to π+π-Υ(1S) and π+π-Υ(2S). Physical Review Letters, 96 (23). p. 232001. ISSN 0031-9007

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Abstract

We present the first measurement of Υ(4S) decays to π+π-Υ(1S) and π+π-Υ(2S) based on a sample of 230×106Υ(4S) mesons collected with the BABAR detector. We measure the product branching fractions B(Υ(4S)→π+π-Υ(1S))×B(Υ(1S)→μ+μ-)=(2.23±0.25stat±0.27syst)×10-6 and B(Υ(4S)→π+π-Υ(2S))×B(Υ(2S)→μ+μ-)=(1.69±0.26stat±0.20syst)×10-6, from which we derive the partial widths Γ(Υ(4S)→π+π-Υ(1S))=(1.8±0.4) keV and Γ(Υ(4S)→π+π-Υ(2S))=(2.7±0.8) keV.

Item Type: Article
Subjects: Q Science > QC Physics
Schools: School of Applied Sciences
Depositing User: Sharon Beastall
Date Deposited: 07 Apr 2011 12:00
Last Modified: 07 Apr 2011 12:00
URI: http://eprints.hud.ac.uk/id/eprint/10069

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