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2011

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

the Belle Collaboration

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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.

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

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In the text, for conciseness, we refer to the initial state as the Υ ⁡ ( 5 S ) \Upsilon(5S) . However it is possible that the final states we discuss have a source that is distinct from the Υ ⁡ ( 5 S ) \Upsilon(5S) ; see K.-F. Chen et al
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