Observation of a Charged Charmoniumlike Structure in e(+)e(-) -> pi(+)pi(-) J/psi at root s=4.26 GeV
- Ablikim, M.
- Achasov, M. N.
- Ai, X. C.
- Albayrak, O.
- Ambrose, D. J.
- An, F. F.
- An, Q.
- Bai, J. Z.
- Ferroli, R. Baldini
- Ban, Y.
- Becker, J.
- Bennett, J. V.
- Bertani, M.
- Bian, J. M.
- Boger, E.
- Bondarenko, O.
- Boyko, I.
- Briere, R. A.
- Bytev, V.
- 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, J. C.
- Chen, M. L.
- Chen, S. J.
- Chen, X.
- Chen, Y. B.
- Cheng, H. P.
- Chu, Y. P.
- Cronin-Hennessy, D.
- Dai, H. L.
- Dai, J. P.
- Dedovich, D.
- Deng, Z. Y.
- Denig, A.
- Denysenko, I.
DOIAbstract
We study the process e(+)e(-) -> pi(+)pi(-) J/psi at a center-of-mass energy of 4.260 GeV using a 525 pb(-1) data sample collected with the BESIII detector operating at the Beijing Electron Positron Collider. The Born cross section is measured to be (62.9 +/- 1.9 +/- 3.7) pb, consistent with the production of the Y(4260). We observe a structure at around 3.9 GeV/c(2) in the pi(+/-) J/psi mass spectrum, which we refer to as the Z(c)(3900). If interpreted as a new particle, it is unusual in that it carries an electric charge and couples to charmonium. A fit to the pi(+/-) J/psi invariant mass spectrum, neglecting interference, results in a mass of (3899.0 +/- 3.6 +/- 4.9) MeV/c(2) and a width of (46 +/- 10 +/- 20) MeV. Its production ratio...
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