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Observation of Z_{c}(3900)^{0} in e^{+}e^{-}→π^{0}π^{0}J/ψ.

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|September 26, 2015
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Researchers observed a new neutral particle, the Z_{c}(3900)^{0}, using the BESIII detector. This discovery provides evidence for a neutral partner to a previously identified four-quark state, furthering our understanding of exotic hadrons.

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Area of Science:

  • Particle Physics
  • Hadron Spectroscopy
  • Quantum Chromodynamics

Background:

  • The existence of exotic hadrons, such as tetraquarks, challenges conventional quark models.
  • Previous observations of charged Z_{c}(3900)^{±} states suggest the possibility of neutral counterparts.

Purpose of the Study:

  • To search for and characterize new neutral exotic hadrons.
  • To investigate the properties of the Z_{c}(3900)^{0} state and its relation to other charged states.

Main Methods:

  • Analysis of a large dataset collected by the BESIII detector at the BEPCII storage ring.
  • Quantitative measurement of the mass, width, and cross-section of the observed neutral state.
  • Interpretation of the observed state within the framework of multi-quark physics.

Main Results:

  • Observation of a new neutral state, Z_{c}(3900)^{0}, with a statistical significance of 10.4σ.
  • Precise measurements of the Z_{c}(3900)^{0} mass (3894.8±2.3±3.2 MeV/c²) and width (29.6±8.2±8.2 MeV).
  • Determination of the Born cross section for e^{+}e^{-}→π^{0}π^{0}J/ψ and the fraction attributed to π^{0}Z_{c}(3900)^{0} production.

Conclusions:

  • The newly observed Z_{c}(3900)^{0} state is interpreted as the neutral partner of the four-quark candidate Z_{c}(3900)^{±}.
  • This finding contributes to the growing evidence for the existence of tetraquarks and expands the spectrum of observed exotic hadrons.