Observation of e⁺e⁻ → π⁰π⁰h_c and a Neutral Charmoniumlike Structure Z(c)(4020)⁰

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Observation of e⁺e⁻ → π⁰π⁰h_c and a Neutral Charmoniumlike Structure Z(c)(4020)⁰

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Title: Observation of e⁺e⁻ → π⁰π⁰h_c and a Neutral Charmoniumlike Structure Z(c)(4020)⁰
Author(s):
Ablikim, M.;
Achasov, M. N.;
Ai, X. C.;
Albayrak, O.;
Albrecht, M.;
Ambrose, D. J.;
Amoroso, A.;
Lou, Xinchou (UT Dallas);
BESIII Collaboration
Item Type: article
Keywords: Show Keywords
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 π⁰h_c invariant mass spectrum, with the width of the Z_c(4020)⁰ fixed to that of its charged isospin partner and possible interferences with non- Z_c(4020)⁰ amplitudes neglected, gives a mass of (4023.9 ± 2.2 ± 3.8) MeV/c² for the Z_c(4020)⁰, where the first error is statistical and the second systematic. © 2014 American Physical Society.
Publisher: American Physical Society
ISSN: 0031-9007
Persistent Link: http://dx.doi.org/10.1103/PhysRevLett.113.212002
http://hdl.handle.net/10735
Bibliographic Citation: Ablikim, M., M. N. Achasov, X. C. Ai, O. Albayrak, et al. 2014. "Observation of e⁺e⁻ → π⁰π⁰h_c and a neutral charmoniumlike structure Z(c)(4020)⁰." Physical Review Letters 113(21), doi:10.1103/PhysRevLett.113.212002.
Terms of Use: ©2014 American Physical Society
Sponsors: This work is supported in part by National Key Basic Research Program of China under Contract No. 2015CB856700; Joint Funds of the National Natural Science Foundation of China under Contracts No. 11079008, No. 11179007, No. U1232201, No. U1332201; National Natural Science Foundation of China (NSFC) under Contracts No. 10935007, No. 11121092, No. 11125525, No. 11235011, No. 11079023, No. 11322544, No. 11335008; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; CAS under Contracts No. KJCX2-YW-N29, No. KJCX2-YW-N45; 100 Talents Program of CAS; German Research Foundation DFG under Contract No. Collaborative Research Center CRC-1044; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470; Russian Foundation for Basic Research under Contract No. 14-07-91152; U.S. Department of Energy under Contracts No. DEFG02- 04ER41291, No. DE-FG02-05ER41374, No. DEFG02- 94ER40823, No. DESC0010118; U.S. National Science Foundation; University of Groningen (RuG) and the Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt; WCU Program of National Research Foundation of Korea under Contract No. R32-2008-000- 10155-0.

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