Observation of Υ(4S) Decays to π+π-Υ(1S) and π+π-Υ(2S)

We present the first measurement of Υ(4S) decays to π+π-Υ(1S) and π+π-Υ(2S) based on a sample of 230×106Υ(4S) mesons collected with the BABAR detector. We measure the product branching fractions B(Υ(4S)→π+π-Υ(1S)) ×B(Υ(1S)→μ+μ-)=(2.23±0.25stat±0.27syst) ×10-6 and B(Υ(4S)→π+π-Υ(2S))×B(Υ(2S) →μ+μ-)=(1...

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Bibliographic Details
Main Authors:	Aubert, B, Barate, R, Bona, M, Boutigny, D, Couderc, F, Karyotakis, Y, Lees, J, Poireau, V, Tisserand, V, Zghiche, A, Grauges, E, Palano, A, Chen, J, Qi, N, Rong, G, Wang, P, Zhu, Y, Eigen, G, Ofte, I, Stugu, B, Abrams, G, Battaglia, M, Brown, D, Button-Shafer, J, Cahn, R
Format:	Journal article
Language:	English
Published:	2006

Observation of Υ(4S) Decays to π+π-Υ(1S) and π+π-Υ(2S)

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