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Measurement of the branching fraction for the decay Υ(4S)Υ(1S)π+π

A. Sokolov et al. (Belle Collaboration)
Phys. Rev. D 79, 051103(R) – Published 20 March 2009

Abstract

We study transitions between Υ states with the emission of charged pions using 604.6fb1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e collider. The measured product branching fraction is B(Υ(4S)Υ(1S)π+π)×B(Υ(1S)μ+μ)=(2.11±0.30(stat)±0.14(sys))×106 and the partial decay width is Γ(Υ(4S)Υ(1S)π+π)=(1.75±0.25(stat)±0.24(sys))keV.

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  • Received 13 January 2009

DOI:https://doi.org/10.1103/PhysRevD.79.051103

©2009 American Physical Society

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Vol. 79, Iss. 5 — 1 March 2009

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