Study of hadronic transitions between Υ states and observation of Υ(4S)ηΥ(1S) decay

B. Aubert et al.
Phys. Rev. D 78, 112002 – Published 11 December 2008

Abstract

We present a study of hadronic transitions between Υ(mS) (m=4, 3, 2) and Υ(nS) (n=2, 1) resonances based on 347.5fb1 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)×104 and measure the ratio of partial widths Γ(Υ(4S)ηΥ(1S))/Γ(Υ(4S)π+πΥ(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+πΥ(1S))<5.2×103 and Γ(Υ(3S)ηΥ(1S))/Γ(Υ(3S)π+πΥ(1S))<1.9×102. We also present new measurements of the ratios Γ(Υ(4S)π+πΥ(2S))/Γ(Υ(4S)π+πΥ(1S))=1.16±0.16stat±0.14syst and Γ(Υ(3S)π+πΥ(2S))/Γ(Υ(3S)π+πΥ(1S))=0.577±0.026stat±0.060syst.

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  • Received 13 July 2008

DOI:https://doi.org/10.1103/PhysRevD.78.112002

©2008 American Physical Society

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Vol. 78, Iss. 11 — 1 December 2008

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