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Coupled-Channel Analysis of the χ_{c1}(3872) Line Shape with BESIII Data.

M Ablikim1, M N Achasov2, P Adlarson3

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

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|April 29, 2024
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Summary

This study precisely measured the chi_c1(3872) particle

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Area of Science:

  • Particle Physics
  • Hadron Spectroscopy

Background:

  • The nature of the chi_c1(3872) exotic hadron state remains a subject of intense theoretical and experimental investigation.
  • Understanding its properties is crucial for advancing models of quantum chromodynamics (QCD) and exotic hadrons.

Purpose of the Study:

  • To perform a precise analysis of the chi_c1(3872) line shape.
  • To investigate the influence of coupled channels and off-shell effects on the chi_c1(3872) resonance.
  • To determine the pole structure and its proximity to the D*D-bar threshold.

Main Methods:

  • Utilized data samples from e+e- -> gamma chi_c1(3872) and related decays collected by the BESIII detector.
  • Employed a line shape parametrization incorporating coupled-channel effects and off-shell D*0 mesons.
  • Analyzed the positions of poles on different Riemann sheets.

Main Results:

  • Determined the line shape mass parameter M_X to be (3871.63 ± 0.13_{-0.05}^{+0.06}) MeV.
  • Identified two poles on the first and second Riemann sheets near the D*0D-bar0 branch cut.
  • Located a pole on the first sheet significantly close to the D*0D-bar0 threshold, 7.04 ± 0.15_{-0.08}^{+0.07} MeV above the D0D-bar0pi0 threshold with an imaginary part of -0.19 ± 0.08_{-0.19}^{+0.14} MeV.

Conclusions:

  • The precise line shape analysis provides critical constraints on the nature of the chi_c1(3872).
  • The proximity of the pole to the D*0D-bar0 threshold supports molecular interpretations of the chi_c1(3872).
  • This work contributes to a deeper understanding of exotic states in particle physics.