Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.112003
Keywords
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Funding
- National Key Basic Research Program of China [2015CB856700]
- National Natural Science Foundation of China (NSFC) [11125525, 11235011, 11322544, 11335008, 11425524]
- Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program
- CAS Center for Excellence in Particle Physics (CCEPP)
- Collaborative Innovation Center for Particles and Interactions (CICPI)
- NSFC
- CAS [11179007, U1232201, U1332201, KJCX2-YW-N29, KJCX2-YW-N45]
- 100 Talents Program of CAS
- INPAC
- Shanghai Key Laboratory for Particle Physics and Cosmology
- German Research Foundation DFG [Collaborative Research Center CRC-1044]
- Istituto Nazionale di Fisica Nucleare, Italy
- Ministry of Development of Turkey [DPT2006K-120470]
- Russian Foundation for Basic Research [14-07-91152]
- U.S. Department of Energy [DE-FG02-04ER41291, DE-FG02-05ER41374, DE-FG02-94ER40823, DESC0010118]
- U.S. National Science Foundation
- University of Groningen (RuG)
- Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt
- WCU Program of National Research Foundation of Korea [R32-2008-000-10155-0]
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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)(+/-).
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