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Determination of the Spin and Parity of the Zc(3900)

M. Ablikim et al. (BESIII Collaboration)
Phys. Rev. Lett. 119, 072001 – Published 16 August 2017
Physics logo See Synopsis: Filling in a Tetraquark’s Profile

Abstract

The spin and parity of the Zc(3900)± state are determined to be JP=1+ with a statistical significance larger than 7σ over other quantum numbers in a partial wave analysis of the process e+eπ+πJ/ψ. We use a data sample of 1.92fb1 accumulated at s=4.23 and 4.26 GeV with the BESIII experiment. When parametrizing the Zc(3900)± with a Flatté-like formula, we determine its pole mass Mpole=(3881.2±4.2stat±52.7syst)MeV/c2 and pole width Γpole=(51.8±4.6stat±36.0syst)MeV. We also measure cross sections for the process e+eZc(3900)+π+c.c.J/ψπ+π and determine an upper limit at the 90% confidence level for the process e+eZc(4020)+π+c.c.J/ψπ+π.

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  • Received 9 June 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.072001

© 2017 American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
  1. Properties
Particles & Fields

Synopsis

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Filling in a Tetraquark’s Profile

Published 16 August 2017

An analysis of electron-positron collision data has determined the spin and parity of a particle thought to consist of four quarks.

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Vol. 119, Iss. 7 — 18 August 2017

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