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Study of e+e- →γωJ /ψ and Observation of X (3872) →ωJ /ψ
, K. Ravindran
Published in American Physical Society
2019
PMID: 31298909
Volume: 122
   
Issue: 23
Abstract
We study the e+e-→γωJ/ψ process using 11.6 fb-1 e+e- annihilation data taken at center-of-mass energies from s=4.008 GeV to 4.600 GeV with the BESIII detector at the BEPCII storage ring. The X(3872) resonance is observed for the first time in the ωJ/ψ system with a significance of more than 5σ. The relative decay ratio of X(3872)→ωJ/ψ and π+π-J/ψ is measured to be R=1.6-0.3+0.4±0.2, where the first uncertainty is statistical and the second systematic (the same hereafter). The s-dependent cross section of e+e-→γX(3872) is also measured and investigated, and it can be described by a single Breit-Wigner resonance, referred to as the Y(4200), with a mass of 4200.6-13.3+7.9±3.0 MeV/c2 and a width of 115-26+38±12 MeV. In addition, to describe the ωJ/ψ mass distribution above 3.9 GeV/c2, we need at least one additional Breit-Wigner resonance, labeled as X(3915), in the fit. The mass and width of the X(3915) are determined. The resonant parameters of the X(3915) agree with those of the Y(3940) in B→KωJ/ψ and of the X(3915) in γγ→ωJ/ψ observed by the Belle and BABAR experiments within errors. © 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the »https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
About the journal
JournalData powered by TypesetPhysical Review Letters
PublisherData powered by TypesetAmerican Physical Society
ISSN00319007
Open AccessNo
Concepts (14)
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    Digital storage
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    Resonance
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    BABAR EXPERIMENT
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    Center-of-mass energies
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    DECAY RATIO
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    E+E- ANNIHILATION
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    GAMMAGAMMA
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    Mass distribution
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    Germanium compounds
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    Article
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    Destruction
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    Error
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    Storage
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    Uncertainty