We have performed a search for the ηb(1S) meson in the radiative decay of the Υ(2S) resonance using a sample of 91.6×106 Υ(2S) events recorded with the BABAR detector at the PEP-II B factory at the SLAC National Accelerator Laboratory. We observe a peak in the photon energy spectrum at Eγ=609.3+4.6−4.5(stat)±1.9(syst)  MeV, corresponding to an ηb(1S) mass of 9394.2+4.8−4.9(stat)±2.0(syst)  MeV/c2. The branching fraction for the decay Υ(2S)→γηb(1S) is determined to be [3.9±1.1(stat)+1.1−0.9(syst)]×10−4. We find the ratio of branching fractions ℬ[Υ(2S)→γηb(1S)]/ℬ[Υ(3S)→γηb(1S)]=0.82±0.24(stat)+0.20−0.19(syst).

Aubert, B., Bona, M., Karyotakis, Y., Lees, J.p., Poireau, V., Prencipe, E., et al. (2009). Evidence for the eta(b)(1S) Meson in Radiative Y(2S) Decay. PHYSICAL REVIEW LETTERS, 103(16), 1-7 [10.1103/PhysRevLett.103.161801].

Evidence for the eta(b)(1S) Meson in Radiative Y(2S) Decay

PATRIGNANI, CLAUDIA;
2009

Abstract

We have performed a search for the ηb(1S) meson in the radiative decay of the Υ(2S) resonance using a sample of 91.6×106 Υ(2S) events recorded with the BABAR detector at the PEP-II B factory at the SLAC National Accelerator Laboratory. We observe a peak in the photon energy spectrum at Eγ=609.3+4.6−4.5(stat)±1.9(syst)  MeV, corresponding to an ηb(1S) mass of 9394.2+4.8−4.9(stat)±2.0(syst)  MeV/c2. The branching fraction for the decay Υ(2S)→γηb(1S) is determined to be [3.9±1.1(stat)+1.1−0.9(syst)]×10−4. We find the ratio of branching fractions ℬ[Υ(2S)→γηb(1S)]/ℬ[Υ(3S)→γηb(1S)]=0.82±0.24(stat)+0.20−0.19(syst).
2009
Aubert, B., Bona, M., Karyotakis, Y., Lees, J.p., Poireau, V., Prencipe, E., et al. (2009). Evidence for the eta(b)(1S) Meson in Radiative Y(2S) Decay. PHYSICAL REVIEW LETTERS, 103(16), 1-7 [10.1103/PhysRevLett.103.161801].
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/11585/544842
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