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arXiv · 0901.1431

Measurement of the branching fraction for the decay Upsilon(4S) -> Upsilon(1S)pi+pi-

The Belle Collaboration·A. Sokolov·M. Shapkin
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Abstract

We study transitions between Upsilon states with the emission of charged pions using 604.6/fb of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The measured product branching fraction is B(Upsilon(4S) -> Upsilon(1S)pi+pi-) * B(Upsilon(1S) -> mu+mu-) = = (2.11 +/- 0.30(stat.) +/- 0.14(sys.))*10^(-6) and the partial decay width is Gamma(Upsilon(4S) -> Upsilon(1S)pi+pi-) = = (1.75 +/- 0.25(stat.) +/- 0.24(sys.)) keV.

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The Belle Collaboration, A. Sokolov, M. Shapkin. 2009-03-23. Measurement of the branching fraction for the decay Upsilon(4S) -> Upsilon(1S)pi+pi-. https://doi.org/10.1103/physrevd.79.051103

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