Measurement of the decay ϒ′→ϒπ+π−

Niczyporuk, B.; Żeludziewicz, T.; Chen, K. W.; Hartung, R.; Folger, G.; Lurz, B.; Vogel, H.; Volland, U.; Wegener, H.; Bienlein, J. K.; Graumann, R.; Krüger, J.; Leissner, M.; Schmitz, M.; Heimlich, F. H.; Nernst, R.; Schwarz, A. S.; Strohbusch, U.; Trost, H. J.; Zschorsch, P.; Engler, A.; Kraemer, R. W.; Messing, F.; Rippich, C.; Stacey, B.J.; Youssef, S.; Fridman, A.; Alexander, G.; Av-Shalom, A.; Bella, G.; Gnat, Y.; Grunhaus, J.; Hörber, E.; Langguth, W.; Scheer, M.

doi:10.1016/0370-2693(81)90295-1

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Cited by 36 publications

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“…(See Figure 1. ) For the first 22 years after the observation of hadronic transitions among bottomonium states by LENA [3] and CUSB [4], only the six ππ transitions among the vector Υ(nS) bottomonia were known. CLEO has recently observed three other examples of hadronic transitions in bottomonium: χ b1,2 (2P )→ωΥ(1S) [5], χ b (2P )→ππχ b (1P ) [6] and Υ(2S)→ηΥ(1S) [7].…”

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confidence: 99%

Improved measurement of branching fractions forππtransitions amongΥ(nS)states

Bhari¹,

Pedlar²,

Cronin-Hennessy³

et al. 2009

Phys. Rev. D

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Using samples of (5.93 ± 0.10) × 10 6 Υ(3S) decays and (9.11 ± 0.14) × 10 6 Υ(2S) decays collected with the CLEO detector, we report improved measurements of the branching fractions for the following five transitions: B(Υ(3S)→Υ(1S)π + π − ) = (4.46 ± 0.01 ± 0.13)%, B(Υ(2S)→Υ(1S)π + π − ) = (18.02 ± 0.02 ± 0.61)%, B(Υ(3S)→Υ(1S)π 0 π 0 ) = (2.24 ± 0.09 ± 0.11)%, B(Υ(2S)→Υ(1S)π 0 π 0 ) = (8.43±0.16±0.42)% and B(Υ(3S)→Υ(2S)π 0 π 0 ) = (1.82±0.09±0.12)%. In each case the first uncertainty reported is statistical, while the second is systematic.

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confidence: 99%