Evidence for the ηb(2S) and Observation of hb(1P)ηb(1S)γ and hb(2P)ηb(1S)γ

R. Mizuk et al. (Belle Collaboration)
Phys. Rev. Lett. 109, 232002 – Published 6 December 2012

Abstract

We report the first evidence for the ηb(2S) using the hb(2P)ηb(2S)γ transition and the first observation of the hb(1P)ηb(1S)γ and hb(2P)ηb(1S)γ transitions. The mass and width of the ηb(1S) and ηb(2S) are measured to be mηb(1S)=(9402.4±1.5±1.8)MeV/c2, mηb(2S)=(9999.0±3.51.9+2.8)MeV/c2, and Γηb(1S)=(10.83.72.0+4.0+4.5)MeV. We also update the hb(1P) and hb(2P) mass measurements. We use a 133.4fb1 data sample collected at energies near the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e collider.

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  • Received 29 May 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.232002

© 2012 American Physical Society

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Vol. 109, Iss. 23 — 7 December 2012

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