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Observation of h_{c} Radiative Decay h_{c}→γη^{'} and Evidence for h_{c}→γη.

M Ablikim1, M N Achasov2, X C Ai1

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Physical Review Letters
|July 9, 2016
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Summary

Researchers observed the radiative decays of the P-wave spin singlet charmonium resonance, h_c (h_c), for the first time. Measurements of branching fractions for h_c decays into eta prime and eta were successfully performed.

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Area of Science:

  • Particle Physics
  • Quantum Chromodynamics
  • Hadron Spectroscopy

Background:

  • The charmonium system, composed of a charm quark and antiquark, provides a crucial testing ground for quantum chromodynamics.
  • Understanding the properties of P-wave charmonium states, particularly spin-singlet states like h_c, is essential for refining theoretical models.
  • Radiative decays offer a unique window into the internal structure and interactions of these mesons.

Purpose of the Study:

  • To search for and characterize the radiative decays of the P-wave spin singlet charmonium resonance, h_c.
  • To experimentally determine the branching fractions for the h_c → γη' and h_c → γη decay channels.
  • To provide precise measurements that can constrain theoretical predictions in charmonium physics.

Main Methods:

  • Analysis of a large dataset of 4.48×10^8 ψ' events collected by the BESIII detector.
  • Event selection criteria designed to isolate the radiative decay channels h_c → γη' and h_c → γη.
  • Statistical analysis to determine the significance of observed signals and measure branching fractions, accounting for systematic uncertainties.

Main Results:

  • Observation of the radiative decay channels h_c → γη' with a statistical significance of 8.4σ.
  • Observation of the radiative decay channel h_c → γη with a statistical significance of 4.0σ.
  • Measurement of the branching fractions: B(h_c → γη') = (1.52 ± 0.27 ± 0.29) × 10^-3 and B(h_c → γη) = (4.7 ± 1.5 ± 1.4) × 10^-4.

Conclusions:

  • The first experimental evidence for the radiative decays of the h_c resonance into γη' and γη has been established.
  • The measured branching fractions provide valuable quantitative data for understanding charmonium decay mechanisms.
  • These findings contribute to a more comprehensive picture of the charmonium spectrum and its properties.