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Observation of a Charged Charmoniumlike Structure in e+eπ+πJ/ψ at s=4.26GeV

M. Ablikim et al. (BESIII Collaboration)
Phys. Rev. Lett. 110, 252001 – Published 17 June 2013
Physics logo See Viewpoint: New Particle Hints at Four-Quark Matter


We study the process e+eπ+πJ/ψ at a center-of-mass energy of 4.260 GeV using a 525pb1 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 3.9GeV/c2 in the π±J/ψ mass spectrum, which we refer to as the Zc(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 π±J/ψ invariant mass spectrum, neglecting interference, results in a mass of (3899.0±3.6±4.9)MeV/c2 and a width of (46±10±20)MeV. Its production ratio is measured to be R=(σ(e+eπ±Zc(3900)π+πJ/ψ)/σ(e+eπ+πJ/ψ))=(21.5±3.3±7.5)%. In all measurements the first errors are statistical and the second are systematic.

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  • Received 24 March 2013


© 2013 American Physical Society


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New Particle Hints at Four-Quark Matter

Published 17 June 2013

Two experiments have detected the signature of a new particle, which may combine quarks in a way not seen before.

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Study of e+eπ+πJ/ψ and Observation of a Charged Charmoniumlike State at Belle

Z. Q. Liu et al. (Belle Collaboration)
Phys. Rev. Lett. 110, 252002 (2013)

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Vol. 110, Iss. 25 — 21 June 2013

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