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Observation of a_{0}^{0}(980)-f_{0}(980) Mixing.

M Ablikim1, M N Achasov2, S Ahmed3

  • 1Institute of High Energy Physics, Beijing 100049, People's Republic of China.

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|August 8, 2018
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Summary
This summary is machine-generated.

This study reports the first observation of mixing between the a_{0}^{0}(980) and f_{0}(980) mesons. These findings enhance our understanding of the nature of these important scalar mesons.

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Area of Science:

  • Particle Physics
  • Hadron Spectroscopy
  • Quantum Chromodynamics

Background:

  • The nature of scalar mesons a_{0}^{0}(980) and f_{0}(980) is a long-standing puzzle in particle physics.
  • Understanding their properties is crucial for testing Quantum Chromodynamics (QCD) models.
  • Previous studies have suggested complex structures for these mesons, possibly involving multi-quark states.

Purpose of the Study:

  • To investigate the potential mixing between the a_{0}^{0}(980) and f_{0}(980) mesons.
  • To provide experimental evidence for or against such mixing.
  • To constrain the coupling constants related to these mesons and their interactions.

Main Methods:

  • Analysis of J/ψ and ψ(3686) decays using large datasets from the BESIII detector.
  • Searched for signals of f_{0}(980) decaying into a_{0}^{0}(980) and vice versa.
  • Statistical analysis to determine the significance of observed signals and measure branching fractions and mixing intensities.

Main Results:

  • First observation of a_{0}^{0}(980)-f_{0}(980) mixing in J/ψ and χ_{c1} decays.
  • Observed significant signals for f_{0}(980)→a_{0}^{0}(980) (7.4σ) and a_{0}^{0}(980)→f_{0}(980) (5.5σ) mixing.
  • Measured corresponding branching fractions and mixing intensities, and estimated constraints on coupling constants.

Conclusions:

  • The observed mixing provides strong evidence for a non-trivial relationship between the a_{0}^{0}(980) and f_{0}(980) mesons.
  • These results contribute to a deeper understanding of the internal structure and nature of these scalar mesons.
  • The findings offer valuable input for theoretical models aiming to explain the properties of light scalar mesons.