Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics（1995）
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摘要
The reaction e+e- �� e+e-��*��* �� e+e-Ks 0Ks 0 is studied with the L3 detector at LEP and the formation of the f��2 (1525) resonance is observed. For an integrated luminosity of 114 pb-1, 31��6 f��2 events are found. Their angular distribution is consistent with a pure helicity two. The radiative width times the branching ratio is measured to be ���æ�(f��2)��Br(f�� 2 �� KK?)=(0.093 �� 0.018 �� 0.022) keV. Only three events are found in the f2(1270)-a2(1320) mass region, consistent with destructive f2-a2 interference in the Ks 0Ks 0 final state. The mixing angle of the tensor meson nonet is determined to be �� = (29.4-1.6 +1.4)��.
