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-)=(1.69±0.26stat±0.20syst)×10-6, from which we derive the partial widths Γ(Υ(4S)→π+π-Υ(1S))=(1. 8±0.4)keV and Γ(Υ(4S)→π+π-Υ(2S))=(2. 7±0.8)keV.

Aubert, B., Barate, R., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., et al. (2006). Observation of Υ(4S) Decays to π+π-Υ(1S) and π+π-Υ(2S). PHYSICAL REVIEW LETTERS, 96(23) [10.1103/PhysRevLett.96.232001].

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

CARPINELLI, Massimo;
2006

Abstract

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-)=(1.69±0.26stat±0.20syst)×10-6, from which we derive the partial widths Γ(Υ(4S)→π+π-Υ(1S))=(1. 8±0.4)keV and Γ(Υ(4S)→π+π-Υ(2S))=(2. 7±0.8)keV.
Articolo in rivista - Articolo scientifico
BABAR detector
English
2006
96
23
232001
none
Aubert, B., Barate, R., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., et al. (2006). Observation of Υ(4S) Decays to π+π-Υ(1S) and π+π-Υ(2S). PHYSICAL REVIEW LETTERS, 96(23) [10.1103/PhysRevLett.96.232001].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389809
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