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    Observation of e⁺e⁻ → π⁰π⁰h_c and a Neutral Charmoniumlike Structure Z_c(4020)°

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    Date
    2014-11-18
    Author
    Ablikim, M.
    Achasov, M. N.
    Ai, X. C.
    Albayrak, O.
    Albrecht, M.
    Ambrose, D. J.
    Amoroso, A.
    Lou, Xinchou
    BESIII Collaboration
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    Abstract
    Abstract
    Using data collected with the BESIII detector operating at the Beijing Electron Positron Collider at center-of-mass energies of √s = 4.23, 4.26, and 4.36 GeV, we observe e⁺e⁻ → π⁰π⁰h_c for the first time. The Born cross sections are measured and found to be about half of those of e⁺e⁻ → π⁺π⁻h_c within less than 2σ In the π⁰h_c mass spectrum, a structure at 4.02 GeV/c² is found. It is most likely to be the neutral isospin partner of the Z_c(4020)^± observed in the process of e⁺e⁻ → π⁺π⁻h_c being found. A fit to the π°h_c invariant mass spectrum, with the width of the Z_c(4020)° fixed to that of its charged isospin partner and possible interferences with non- Z_c(4020)° amplitudes neglected, gives a mass of (4023.9 ± 2.2 ± 3.8) MeV/c² for the Z_c(4020)°, where the first error is statistical and the second systematic.
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    http://hdl.handle.net/10735.1/4856
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