We study the Υ(3S,2S)→ηΥ(1S) and Υ(3S,2S)→π+π−Υ(1S) transitions with 122×106Υ(3S) and 100×106Υ(2S) mesons collected by the BABAR detector at the PEP-II asymmetric-energy e+e− collider. We measure ℬ[Υ(2S)→ηΥ(1S)]=(2.39±0.31(stat.)±0.14(syst.))×10−4 and Γ[Υ(2S)→ηΥ(1S)]/Γ[Υ(2S)→π+π−Υ(1S)]=(1.35±0.17(stat.)±0.08(syst.))×10−3. We find no evidence for Υ(3S)→ηΥ(1S) and obtain ℬ[Υ(3S)→ηΥ(1S)]<1.0×10−4 and Γ[Υ(3S)→ηΥ(1S)]/Γ[Υ(3S)→π+π−Υ(1S)]<2.3×10−3 as upper limits at the 90% confidence level. We also provide improved measurements of the Υ(2S)−Υ(1S) and Υ(3S)−Υ(1S) mass differences, 562.170±0.007(stat.)±0.088(syst.)  MeV/c2 and 893.813±0.015(stat.)±0.107(syst.)  MeV/c2, respectively.

Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Martinelli, M., et al. (2011). Study of Y(3S, 2S) -> eta Y(1S) and Y(3S, 2S) -> pi(+) pi(-) Y(1S) hadronic transitions. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 84(9), 1-8 [10.1103/PhysRevD.84.092003].

Study of Y(3S, 2S) -> eta Y(1S) and Y(3S, 2S) -> pi(+) pi(-) Y(1S) hadronic transitions

PATRIGNANI, CLAUDIA;
2011

Abstract

We study the Υ(3S,2S)→ηΥ(1S) and Υ(3S,2S)→π+π−Υ(1S) transitions with 122×106Υ(3S) and 100×106Υ(2S) mesons collected by the BABAR detector at the PEP-II asymmetric-energy e+e− collider. We measure ℬ[Υ(2S)→ηΥ(1S)]=(2.39±0.31(stat.)±0.14(syst.))×10−4 and Γ[Υ(2S)→ηΥ(1S)]/Γ[Υ(2S)→π+π−Υ(1S)]=(1.35±0.17(stat.)±0.08(syst.))×10−3. We find no evidence for Υ(3S)→ηΥ(1S) and obtain ℬ[Υ(3S)→ηΥ(1S)]<1.0×10−4 and Γ[Υ(3S)→ηΥ(1S)]/Γ[Υ(3S)→π+π−Υ(1S)]<2.3×10−3 as upper limits at the 90% confidence level. We also provide improved measurements of the Υ(2S)−Υ(1S) and Υ(3S)−Υ(1S) mass differences, 562.170±0.007(stat.)±0.088(syst.)  MeV/c2 and 893.813±0.015(stat.)±0.107(syst.)  MeV/c2, respectively.
2011
Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Martinelli, M., et al. (2011). Study of Y(3S, 2S) -> eta Y(1S) and Y(3S, 2S) -> pi(+) pi(-) Y(1S) hadronic transitions. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 84(9), 1-8 [10.1103/PhysRevD.84.092003].
Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Milanes, D. A.; Palano, A.; Pappagallo, M.; Eigen, G.; Stugu, B....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/537512
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