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Study of e(+)e(- )-> pi(+)pi(-)pi(0)eta(c) and evidence for Z(c) (3900)(+/-) decaying into rho(+/-)eta(c)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.ORCID iD: 0000-0001-6280-3851
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
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Number of Authors: 4832019 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 100, no 11, article id 111102Article in journal (Refereed) Published
Abstract [en]

We study the reaction e(+)e(-) -> pi(+)pi(-)pi(0)eta(c) for the first time using data samples collected with the BESIII detector at center-of-mass energies root s = 4.226, 4.258, 4.358, 4.416, and 4.600 GeV. Evidence of this process is found and the Born cross section sigma(B) (e(+)e(-) -> pi(+)pi(-)pi(0)eta(c)), excluding e(+)e(-) -> omega eta(c) and eta eta(c), is measured to be (46(-11)(+12) +/- 10) pb at root s = 4.226 GeV. Evidence for the decay Z(c) (3900)(+/-) -> rho(+/-)eta(c) is reported at root s = 4.226 GeV with a significance of 3.9 sigma, including systematic uncertainties, and the Born cross section times branching fraction sigma(B)(e(+)e(-) -> pi(-/+)Z(c) (3900)(+/-)) x B(Z(c)(3900)(+/-) -> rho(+/-)eta(c)) is measured to be (48 +/- 11 +/- 11) pb, which indicates that e(+) e(-)-> pi(-/+)Z(c) (3900)(+/-) -> pi(-/+)rho(+/-)eta(c) dominates the e(+) e(-) -> pi(+)pi(-)pi(0)eta(c) process. The Z(c)(3900)(+/-)->rho(+/-)eta(c) signal is not significant at the other center-of-mass energies and the corresponding upper limits are determined. In addition, no significant signal is observed in a search for Z(c) (4020)(+/-) -> rho(+/-)eta(c) with the same data samples. The ratios R-Zc(3900) = B(Z(c)(3900)(+/-) -> rho(+/-)eta(c))/B(Z(c)(3900)(+/-) -> pi(+/-)J/psi) and RZ(c)((4020)) = B(Z(c)(4020)(+/-) -> rho(+/-)eta(c))/B(Z(c)(4020)(+/-) -> pi(+/-)eta(c)) are obtained and compared with different theoretical interpretations of the Z(c)(3900)(+/-) and Z(c)(4020)(+/-).

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 100, no 11, article id 111102
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-402665DOI: 10.1103/PhysRevD.100.111102ISI: 000504637500001OAI: oai:DiVA.org:uu-402665DiVA, id: diva2:1386524
Funder
Knut and Alice Wallenberg Foundation, 2016.0157Swedish Research Council
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.100.111102

Available from: 2020-01-17 Created: 2020-01-17 Last updated: 2020-01-17Bibliographically approved

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Adlarson, PatrikBiernat, JacekIkegami Andersson, WalterJohansson, TordKupsc, AndrzejLi, CuiPapenbrock, MichaelPettersson, JoachimSchönning, KarinThorén, ViktorWolke, Magnus
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