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Observation of Z(c)(3900)(0) in e(+)e(-) -> pi(0)pi(0) J/Psi
Inst High Energy Phys, Beijing 100049, Peoples R China..
GI Budker Inst Nucl Phys SB RAS BINP, Novosibirsk 630090, Russia.;Novosibirsk State Univ, Novosibirsk 630090, Russia..
Inst High Energy Phys, Beijing 100049, Peoples R China..
Carnegie Mellon Univ, Pittsburgh, PA 15213 USA..
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2015 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 115, no 11, article id 112003Article in journal (Refereed) Published
Abstract [en]

Using a data sample collected with the BESIII detector operating at the BEPCII storage ring, we observe a new neutral state Z(c)(3900)(0) with a significance of 10.4 sigma. The mass and width are measured to be 3894.8 +/- 2.3 +/- 3.2 MeV/c(2) and 29.6 +/- 8.2 +/- 8.2 MeV, respectively, where the first error is statistical and the second systematic. The Born cross section for e(+)e(-) -> pi(0)pi(0) J/Psi and the fraction of it attributable to pi(0)Z(c)(3900)(0) -> pi(0)pi(0) J/Psi in the range E-c.m. = 4.19-4.42 GeV are also determined. We interpret this state as the neutral partner of the four-quark candidate Z(c)(3900)(+/-).

Place, publisher, year, edition, pages
2015. Vol. 115, no 11, article id 112003
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-264045DOI: 10.1103/PhysRevLett.115.112003ISI: 000361040800002PubMedID: 26406823OAI: oai:DiVA.org:uu-264045DiVA, id: diva2:859209
Available from: 2015-10-06 Created: 2015-10-05 Last updated: 2017-12-01Bibliographically approved

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Johansson, TordKupsc, AndrezejLi, CuiPettersson, JoachimSchönning, KarinWolke, Magnus

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