We present a study of hadronic transitions between Υ(mS) (m=4, 3, 2) and Υ(nS) (n=2, 1) resonances based on 347.5  fb−1 of data taken with the BABAR detector at the PEP-II storage rings. We report the first observation of Υ(4S)→ηΥ(1S) decay with a branching fraction ℬ(Υ(4S)→ηΥ(1S))=(1.96±0.06stat±0.09syst)×10−4 and measure the ratio of partial widths Γ(Υ(4S)→ηΥ(1S))/Γ(Υ(4S)→π+π−Υ(1S))=2.41±0.40stat±0.12syst. We set 90% CL upper limits on the ratios Γ(Υ(2S)→ηΥ(1S))/Γ(Υ(2S)→π+π−Υ(1S))<5.2×10−3 and Γ(Υ(3S)→ηΥ(1S))/Γ(Υ(3S)→π+π−Υ(1S))<1.9×10−2. We also present new measurements of the ratios Γ(Υ(4S)→π+π−Υ(2S))/Γ(Υ(4S)→π+π−Υ(1S))=1.16±0.16stat±0.14syst and Γ(Υ(3S)→π+π−Υ(2S))/Γ(Υ(3S)→π+π−Υ(1S))=0.577±0.026stat±0.060syst.

Aubert, B., Bona, M., Karyotakis, Y., Lees, J.p., Poireau, V., Prencipe, E., et al. (2008). Study of hadronic transitions between Y states and observation of Y(4S) -> eta Y(1S) decay. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 78(11), 1-11 [10.1103/PhysRevD.78.112002].

Study of hadronic transitions between Y states and observation of Y(4S) -> eta Y(1S) decay

PATRIGNANI, CLAUDIA;
2008

Abstract

We present a study of hadronic transitions between Υ(mS) (m=4, 3, 2) and Υ(nS) (n=2, 1) resonances based on 347.5  fb−1 of data taken with the BABAR detector at the PEP-II storage rings. We report the first observation of Υ(4S)→ηΥ(1S) decay with a branching fraction ℬ(Υ(4S)→ηΥ(1S))=(1.96±0.06stat±0.09syst)×10−4 and measure the ratio of partial widths Γ(Υ(4S)→ηΥ(1S))/Γ(Υ(4S)→π+π−Υ(1S))=2.41±0.40stat±0.12syst. We set 90% CL upper limits on the ratios Γ(Υ(2S)→ηΥ(1S))/Γ(Υ(2S)→π+π−Υ(1S))<5.2×10−3 and Γ(Υ(3S)→ηΥ(1S))/Γ(Υ(3S)→π+π−Υ(1S))<1.9×10−2. We also present new measurements of the ratios Γ(Υ(4S)→π+π−Υ(2S))/Γ(Υ(4S)→π+π−Υ(1S))=1.16±0.16stat±0.14syst and Γ(Υ(3S)→π+π−Υ(2S))/Γ(Υ(3S)→π+π−Υ(1S))=0.577±0.026stat±0.060syst.
2008
Aubert, B., Bona, M., Karyotakis, Y., Lees, J.p., Poireau, V., Prencipe, E., et al. (2008). Study of hadronic transitions between Y states and observation of Y(4S) -> eta Y(1S) decay. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 78(11), 1-11 [10.1103/PhysRevD.78.112002].
Aubert, B; Bona, M; Karyotakis, Y; Lees, Jp; Poireau, V; Prencipe, E; Prudent, X; Tisserand, V; Tico, Jg; Grauges, E; Lopez, L; Palano, A; Pappagallo,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/533838
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