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=609.3-4.5+4.6(stat)±1.9(syst)MeV, corresponding to an ηb(1S) mass of 9394.2-4.9+4.8(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)-0.9+1.1(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)-0.19+0.20(syst).

Aubert, B., Bona, M., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., et al. (2009). Evidence for the ηb(1S) meson in radiative Υ(2S) decay. PHYSICAL REVIEW LETTERS, 103(16) [10.1103/PhysRevLett.103.161801].

Evidence for the ηb(1S) meson in radiative Υ(2S) decay

CARPINELLI, Massimo;
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=609.3-4.5+4.6(stat)±1.9(syst)MeV, corresponding to an ηb(1S) mass of 9394.2-4.9+4.8(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)-0.9+1.1(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)-0.19+0.20(syst).
Articolo in rivista - Articolo scientifico
BABAR detector
English
B. Aubert et al. (BABAR Collaboration)
Aubert, B., Bona, M., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., et al. (2009). Evidence for the ηb(1S) meson in radiative Υ(2S) decay. PHYSICAL REVIEW LETTERS, 103(16) [10.1103/PhysRevLett.103.161801].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389468
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