Observation of e(+)e(-) -> pi(0)pi(0)h(c) and a Neutral Charmoniumlike Structure Z(c)(4020)(0)
- Ablikim, M.
- Achasov, M. N.
- Ai, X. C.
- Albayrak, O.
- Albrecht, M.
- Ambrose, D. J.
- Amoroso, A.
- An, F. F.
- An, Q.
- Bai, J. Z.
- Ferroli, R. Baldini
- Ban, Y.
- Bennett, D. W.
- Bennett, J. V.
- Bertani, M.
- Bettoni, D.
- Bian, J. M.
- Bianchi, F.
- Boger, E.
- Bondarenko, O.
- Boyko, I.
- Briere, R. A.
- Cai, H.
- Cai, X.
- Cakir, O.
- Calcaterra, A.
- Cao, G. F.
- Cetin, S. A.
- Chang, J. F.
- Chelkov, G.
- Chen, G.
- Chen, H. S.
- Chen, H. Y.
- Chen, J. C.
- Chen, M. L.
- Chen, S. J.
- Chen, X.
- Chen, X. R.
- Chen, Y. B.
- Cheng, H. P.
- Chu, X. K.
- Chu, Y. P.
- Cibinetto, G.
- Haddadi, Z.
- Kalantar-Nayestanaki, N.
- Kavatsyuk, M.
- Loehner, H.
- Messchendorp, J. G.
- Moeini, H.
- Tiemens, M.
DOIAbstract
Using data collected with the BESIII detector operating at the Beijing Electron Positron Collider at center-of-mass energies of root s = 4.23, 4.26, and 4.36 GeV, we observe e(+)e(-) -> pi(0)pi(0)h(c) for the first time. The Born cross sections are measured and found to be about half of those of e(+)e(-) -> pi(+)pi(-)h(c) within less than 2 sigma. In the pi(0)h(c) mass spectrum, a structure at 4.02 GeV/c(2) is found. It is most likely to be the neutral isospin partner of the Z(c)(4020)(+/-) observed in the process of e(+)e(-) -> pi(+)pi(-)h(c) being found. A fit to the pi(0)h(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)...
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