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Measurement of the f0(1270) polarization in the J/ψ → f0γ decay |
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| Authors: | G Alexander L Criegee HC Dehne K Derikum R Devenish G Flügge G Franke Ch Gerke E Hackmack P Harms G Horlitz Th Kahl G Knies E Lehmann R Schmitz RL Thompson U Timm K Wacker |
| Institution: | Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany |
| Abstract: | The polarization of the f0(1270) and ?0(770) produced in the J/ψ decays into f0γ and ?0π0 are measured in e+e? collisions at 3.1 GeV. A fit to the f0 production and decay angular distributions yields the values A1/A0 = 0.6 ± 0.3 and A2/A0 = 0.3 ?1.6+0.6, where Aλ are the f0 helicity amplitudes. These results are in good agreement with the values predicted from a QCD two-gluon-exchange model. In addition an upper limit of 2.3 × 10?4 is obtained for the J/ψ → f′0(1514) γ decay branching ratio which implies Γ(J/ψ → f′γ)/Γ(J/ψ → f0γ) ? 0.12 ± 0.05. |
| Keywords: | PLUTO Collaboration |
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