The radiative decay J/ψ → γ π+ π- has been studied using the 8.6 million J/ψ produced in the DM2 experiment at the DCI e+e- storage rings at Orsay. The π+ π- mass spectrum shows a clean f2 (1270) signal, and the possible presence of two other states at the f2 (1720) and f4 (2030) masses. For the f2 (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 the J=2 assignment, with helicity parameters x=0.83±0.06 and y=0.01±0.06. The existence of higher mass states is discussed. © 1987 Springer-Verlag.
Radiative decay of J/ψ into γ π+ π-
BISELLO, DARIO;BUSETTO, GIOVANNI;SARTORI, PAOLO;
1987
Abstract
The radiative decay J/ψ → γ π+ π- has been studied using the 8.6 million J/ψ produced in the DM2 experiment at the DCI e+e- storage rings at Orsay. The π+ π- mass spectrum shows a clean f2 (1270) signal, and the possible presence of two other states at the f2 (1720) and f4 (2030) masses. For the f2 (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 the J=2 assignment, with helicity parameters x=0.83±0.06 and y=0.01±0.06. The existence of higher mass states is discussed. © 1987 Springer-Verlag.
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