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arxiv: 1110.2251 · v1 · submitted 2011-10-11 · ✦ hep-ex

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Observation of two charged bottomonium-like resonances in Y(5S) decays

The Belle Collaboration
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classification ✦ hep-ex
keywords chargeddecaysgammaobservationstructuresassociationasymmetric-energyaveraged
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We report the observation of two narrow structures in the mass spectra of the pi+-Y(nS) (n=1,2,3) and pi+-hb(mP)(m$ (m=1,2) pairs that are produced in association with a single charged pion in Y(5S) decays. The measured masses and widths of the two structures averaged over the five final states are M_1=(10607.2+-2.0) MeV/c2, Gamma_1=(18.4+-2.4) MeV and M_2=(10652.2+-1.5) MeV/c2, Gamma_2=(11.5+-2.2) MeV. The results are obtained with a 121.4 1/fb data sample collected with the Belle detector in the vicinity of the Y(5S) resonance at the KEKB asymmetric-energy e+e- collider.

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