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

We study transitions between Υ states with the emission of charged pions using 604.6fb-1 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))×10-6 and the partial decay width is Γ(Υ(4S)→Υ(1S)π+π-)=(1.75±0.25(stat)±0. 24(sys))keV. © 2009 The American Physical Society.


Published in:
Physical Review D - Particles, Fields, Gravitation and Cosmology, 79, 5, 051103(R)
Year:
2009
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Scopus: 2-s2.0-64149100648
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 Record created 2010-11-05, last modified 2018-03-21


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