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We study transitions between Upsilon states with the emission of chargedpions using 477 fb^{-1} of data collected with the Belle detector at the KEKBasymmetric-energy e+ e- collider. We select inclusive Upsilon(4S) -> mu+ mu-pi+ pi- X events (where X represents anything) and observe a peak in thedistribution of the mass difference Delta M = (M(mu+mu-pi+pi-) -M(mu+mu-)).This peak, at Delta M = (1119.2 +/- 0.4) MeV/c^2, is identified as a signal forthe decay Upsilon(4S) -> Upsilon(1S) pi+ pi- with a subsequent transitionUpsilon(1S) -> mu+ mu-. The measured product branching fraction BR(Upsilon(4S)-> Upsilon(1S) pi+ pi-) x BR(Upsilon(1S) -> mu+mu-)=(4.4 +/- 0.8(stat.) +/-0.6(sys.)) x 10^{-6}. When the PDG value for BR(Upsilon(1S) -> mu+mu-) is used,this corresponds to BR(Upsilon(4S) -> Upsilon(1S) pi+ pi-) = (1.8 +/-0.3(stat.) +/- 0.2(sys.)) x 10^{-4} and a partial decay width Gamma(Upsilon(4S)-> Upsilon(1S) pi+ pi-)=(3.7 +/- 0.6(stat.) +/- 0.7(sys.)) keV.Comment: 5 pages, 4 figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Observation of the decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Υ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>4</mml:mn><mml:mi>S</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:mo>→</mml:mo><mml:mi>Υ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>1</mml:mn><mml:mi>S</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>

Observation of the decayΥ(4S)→Υ(1S)π+π−