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.

Study of Υ(3S,2S)→ηΥ(1S) and Υ(3S,2S)→π^{+}π^{-}Υ(1S) hadronic transitions / J., L., V., P., V., T., J., G.T., E., G., M., M., D., M., A., P., M., P., G., E., B., S., D., B., L., K., Kolomensky, Y.u., G., L., H., K., T., S., D., A., C., H., T., M., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - STAMPA. - 84:(2011), pp. 092003-1-092003-8. [10.1103/PhysRevD.84.092003]

Study of Υ(3S,2S)→ηΥ(1S) and Υ(3S,2S)→π^{+}π^{-}Υ(1S) hadronic transitions

LANCERI, LIVIO;VITALE, LORENZO;
2011-01-01

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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2567023
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