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

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arxiv 1110.2251 v1 pith:TNGM5VPY submitted 2011-10-11 hep-ex

the Belle Collaboration This is my paper · ORCID
classification hep-ex
keywords chargeddecaysgammaobservationstructuresassociationasymmetric-energyaveraged
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abstract

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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Cited by 5 Pith papers

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    This Lanzhou-group review argues that coupled-channel (unquenched) effects, not exotic constituents, are the common thread explaining charmonium anomalies from the rho-pi puzzle to the Y-problem states.

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