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Observation of e+e- → γX(3872) at BESIII.

M Ablikim1, M N Achasov2, X C Ai1

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

Physical Review Letters
|March 25, 2014
PubMed
Summary

The BESIII experiment observed the process e+e-→ γX(3872) for the first time, measuring the X(3872) mass. This finding supports the radiative transition process Y(4260) → γX(3872).

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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Quantum Chromodynamics

Background:

  • The X(3872) is a complex charmonium state whose nature remains under investigation.
  • Understanding its production mechanisms provides insights into the strong interaction.

Purpose of the Study:

  • To observe the process e+e-→ γX(3872) for the first time.
  • To measure the mass and production properties of the X(3872) state.
  • To investigate the radiative transition Y(4260) → γX(3872).

Main Methods:

  • Data analysis from the BESIII detector at the BEPCII storage ring.
  • Collected data at center-of-mass energies ranging from 4.009 to 4.420 GeV.
  • Statistical analysis to determine significance and measure physical quantities.

Main Results:

  • The process e+e-→ γX(3872) was observed with a statistical significance of 6.3σ.
  • The measured mass of the X(3872) is (3871.9 ± 0.7stat ± 0.2syst) MeV/c², consistent with previous measurements.
  • Measurements of the product of the cross section and branching fraction were reported at various energies.

Conclusions:

  • The first observation of e+e-→ γX(3872) provides crucial data for understanding charmonium physics.
  • The results are consistent with the radiative transition Y(4260) → γX(3872), supporting theoretical models.
  • Further studies can elucidate the internal structure and production mechanisms of exotic hadrons.