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Radiative Decay of J/ψJ/\psi Into γπ+π−\gamma \pi^+ \pi^-

Collaboration
•
Apr, 1987
16 pages
Published in:
  • Z.Phys.C 36 (1987) 369-376
DOI:
Report number:
  • LAL 87-10
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Abstract: (Springer)
The radiative decayJ/ψ → γ π+ π− has been studied using the 8.6 millionJ/ψ produced in the DM2 experiment at the DCIe+e− storage rings at Orsay. The π+ π− mass spectrum shows a cleanf2 (1270) signal, and the possible presence of two other states at thef2 (1720) andf4 (2030) masses. For thef2 (1270), the branching ratio BR(J/ψ →γf)xBR(f→π+ π−) is measured to be (7.50±0.30±1.12)×10−4, and the spin analysis prefers theJ=2 assignment, with helicity parametersx=0.83±0.06 andy=0.01±0.06. The existence of higher mass states is discussed.
  • ELECTRON POSITRON: ANNIHILATION
  • ANNIHILATION: ELECTRON POSITRON
  • ELECTRON POSITRON: COLLIDING BEAMS
  • COLLIDING BEAMS: ELECTRON POSITRON
  • J/PSI(3100): ELECTROPRODUCTION
  • ELECTROPRODUCTION: J/PSI(3100)
  • J/PSI(3100): RADIATIVE DECAY
  • RADIATIVE DECAY: J/PSI(3100)
  • J/PSI(3100): BRANCHING RATIO
  • F2(1270)