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 Upsilon(4S) decays to pi(+)pi(-)Upsilon(1S) and pi(+)pi(-)Upsilon(2S). PHYSICAL REVIEW LETTERS, 96(23), 1-7 [10.1103/PhysRevLett.96.232001].

Observation of Upsilon(4S) decays to pi(+)pi(-)Upsilon(1S) and pi(+)pi(-)Upsilon(2S)

PATRIGNANI, CLAUDIA;
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.
2006
Aubert, B., Barate, R., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., et al. (2006). Observation of Upsilon(4S) decays to pi(+)pi(-)Upsilon(1S) and pi(+)pi(-)Upsilon(2S). PHYSICAL REVIEW LETTERS, 96(23), 1-7 [10.1103/PhysRevLett.96.232001].
Aubert, B; Barate, R; Bona, M; Boutigny, D; Couderc, F; Karyotakis, Y; Lees, Jp; Poireau, V; Tisserand, V; Zghiche, A; Grauges, E; Palano, A; Chen, Jc...espandi
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/534873
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 78
  • ???jsp.display-item.citation.isi??? 32
social impact