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Observation of ψ(3686)→e^{+}e^{-}χ_{cJ} and χ_{cJ}→e^{+}e^{-}J/ψ.

M Ablikim1, M N Achasov2, X C Ai1

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|June 17, 2017
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Summary
This summary is machine-generated.

This study reports the first observation of psi(3686) decays into electron-positron pairs and chi_cJ states, and chi_cJ decays into electron-positron pairs and J/psi. Branching fractions and helicity angular distribution values were determined.

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Area of Science:

  • Particle Physics
  • Quantum Chromodynamics
  • Hadron Spectroscopy

Background:

  • The psi(3686) and chi_cJ states are important in understanding quark dynamics.
  • Previous studies have focused on radiative or hadronic decays, with limited exploration of dilepton decays.

Purpose of the Study:

  • To search for and observe the decays psi(3686) -> e+e- chi_cJ and chi_cJ -> e+e- J/psi.
  • To measure the branching fractions and helicity angular distribution parameters for these newly observed decay modes.

Main Methods:

  • Analysis of 4.479 x 10^8 psi(3686) events collected by the BESIII detector.
  • Event reconstruction and selection for dilepton and J/psi final states.
  • Statistical analysis to determine branching fractions and angular distribution parameters.

Main Results:

  • First observation of psi(3686) -> e+e- chi_cJ (J=0,1,2) and chi_cJ -> e+e- J/psi (J=0,1,2).
  • Measured branching fractions for these decays are reported with uncertainties.
  • Ratios of branching fractions and helicity parameters (alpha) are determined.

Conclusions:

  • The dilepton decay modes provide new insights into the properties of psi(3686) and chi_cJ states.
  • These findings contribute to a more comprehensive understanding of heavy quarkonium decays.
  • The results serve as a benchmark for future theoretical and experimental investigations.